Improves geometry conversion performance

Introduces caching mechanisms for fragment IDs and geometry to avoid redundant processing, significantly enhancing geometry conversion speed. Adds methods to clear caches and retrieve statistics for performance monitoring and memory usage estimation. Handles COM exceptions and invalid operations more gracefully, preventing crashes and improving stability.
Adds COM object lifetime management utility
2025-11-15 18:03:36 +00:00 · 2025-11-15 18:03:17 +00:00 · 2025-11-14 19:11:16 +03:00 · 2025-11-14 18:33:32 +03:00 · 2025-11-14 16:41:58 +03:00 · 2025-11-14 14:48:31 +03:00
286 changed files with 5498 additions and 7554 deletions
@@ -1,29 +1,11 @@
-name: .NET Build
+name: .NET Test

-on: pull_request
+on:
+  pull_request: {}
+  push:
+    branches: ["main"]

 jobs:
-  build:
-    runs-on: windows-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v5
-        with:
-          fetch-depth: 0
-
-      - name: Setup .NET
-        uses: actions/setup-dotnet@v5
-        with:
-          dotnet-version: 8.0.4xx # Align with global.json (including roll forward rules)
-
-      - name: Cache Nuget
-        uses: actions/cache@v4
-        with:
-          path: ~/.nuget/packages
-          key: ${{ runner.os }}-nuget-${{ hashFiles('**/packages.lock.json') }}
-
-      - name: ⚒️ Run build
-        run: ./build.ps1 test
  test:
    runs-on: ubuntu-latest
    steps:
@@ -43,14 +25,18 @@ jobs:
          path: ~/.nuget/packages
          key: ${{ runner.os }}-nuget-${{ hashFiles('**/packages.lock.json') }}

-      - name: ⚒️ Run Build on Linux
-        run: ./build.sh build-linux
-
-      - name: ⚒️ Run tests
-        run: ./build.sh test-only
+      - name: ⚒️ Run Test
+        run: ./build.sh test-and-pack

      - name: Upload coverage reports to Codecov with GitHub Action
        uses: codecov/codecov-action@v5
        with:
          files: Converters/**/coverage.xml
          token: ${{ secrets.CODECOV_TOKEN }}
+
+      # Disabling this code for now, since we no longer need to publish nugets from this repo
+      # But keeping it around incase we ever need in the future.
+      # Ideally, I'd also like to move the nuget token to be an environment secret, and to have tight package scopes
+#      - name: Push to nuget.org
+#        if: ${{ inputs.deployNugets }}
+#        run: dotnet nuget push output/*.nupkg --source "https://api.nuget.org/v3/index.json" --api-key ${{ secrets.CONNECTORS_NUGET_TOKEN }}
@@ -6,8 +6,8 @@ on:
    tags: ["v3.*.*"] # Manual delivery on every 3.x tag

 jobs:
-  build-windows:
-    runs-on: windows-latest
+  build-connectors:
+    runs-on: windows-latest # Keeping on windows for now, for cross platform building of exe projects, we need to use dotnet publish
    env:
      SEMVER: "unset"
      FILE_VERSION: "unset"
@@ -31,11 +31,11 @@ jobs:
          path: ~/.nuget/packages
          key: ${{ runner.os }}-nuget-${{ hashFiles('**/packages.lock.json') }}

-      - name: ⚒️ Run build on Windows
+      - name: ⚒️ Run build and zip connectors
        run: ./build.ps1 zip

      - name: ⬆️ Upload artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
        with:
          name: output-${{ env.SEMVER }}
          path: output/*.*
@@ -48,10 +48,10 @@ jobs:
        run: |
          echo "semver=${{ env.SEMVER }}" >> "$Env:GITHUB_OUTPUT"
          echo "file_version=${{ env.FILE_VERSION }}" >> "$Env:GITHUB_OUTPUT"
-
+          
  deploy-installers:
    runs-on: ubuntu-latest
-    needs: build-windows
+    needs: build-connectors
    env:
      IS_PUBLIC_RELEASE: ${{ github.ref_type == 'tag' }}
    steps:
@@ -63,8 +63,8 @@ jobs:
          token: ${{ secrets.CONNECTORS_GH_TOKEN }}
          inputs: '{
            "run_id": "${{ github.run_id }}",
-            "semver": "${{ needs.build-windows.outputs.semver }}",
-            "file_version": "${{ needs.build-windows.outputs.file_version }}",
+            "semver": "${{ needs.build-connectors.outputs.semver }}",
+            "file_version": "${{ needs.build-connectors.outputs.file_version }}",
            "repo": "${{ github.repository }}",
            "is_public_release": ${{ env.IS_PUBLIC_RELEASE }}
            }'
@@ -74,42 +74,8 @@ jobs:
          wait-for-completion-timeout: 10m
          display-workflow-run-url: true
          display-workflow-run-url-interval: 10s
-
+      
+      # Allows us to inspect the artifacts of failed builds, since this below step will be skipped if the above step fails
      - uses: geekyeggo/delete-artifact@v5
        with:
          name: output-*
-
-  build-linux:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v5
-        with:
-          fetch-depth: 0
-
-      - name: Setup .NET
-        uses: actions/setup-dotnet@v5
-        with:
-          dotnet-version: 8.0.4xx # Align with global.json (including roll forward rules)
-
-      - name: Cache Nuget
-        uses: actions/cache@v4
-        with:
-          path: ~/.nuget/packages
-          key: ${{ runner.os }}-nuget-${{ hashFiles('**/packages.lock.json') }}
-
-      - name: ⚒️ Run tests on Linux
-        run: ./build.sh test-only
-
-      - name: ⚒️ Run Build and Pack on Linux
-        run: ./build.sh build-linux
-
-      - name: Upload coverage reports to Codecov with GitHub Action
-        uses: codecov/codecov-action@v5
-        with:
-          files: Converters/**/coverage.xml
-          token: ${{ secrets.CODECOV_TOKEN }}
-
-      - name: Push to nuget.org
-        if: (github.ref_type == 'tag')
-        run: dotnet nuget push output/*.nupkg --source "https://api.nuget.org/v3/index.json" --api-key ${{secrets.CONNECTORS_NUGET_TOKEN }} --skip-duplicate
@@ -7,9 +7,9 @@ using static SimpleExec.Command;
 const string CLEAN = "clean";
 const string RESTORE = "restore";
 const string BUILD = "build";
-const string BUILD_LINUX = "build-linux";
+const string PACK = "pack";
+const string TEST_AFFECTED = "test-affected";
 const string TEST = "test";
-const string TEST_ONLY = "test-only";
 const string FORMAT = "format";
 const string ZIP = "zip";
 const string RESTORE_TOOLS = "restore-tools";
@@ -19,6 +19,7 @@ const string GEN_SOLUTIONS = "generate-solutions";
 const string DEEP_CLEAN = "deep-clean";
 const string DEEP_CLEAN_LOCAL = "deep-clean-local";
 const string DETECT_AFFECTED = "detect-affected";
+const string TEST_AND_PACK = "test-and-pack";

 //need to pass arguments
 /*var arguments = new List<string>();
@@ -150,7 +151,7 @@ Target(

 Target(
  RESTORE,
-  DependsOn(FORMAT, DETECT_AFFECTED),
+  DependsOn(FORMAT),
  Consts.Solutions,
  async s =>
  {
@@ -181,8 +182,8 @@ Target(CHECK_SOLUTIONS, Solutions.CompareConnectorsToLocal);
 Target(GEN_SOLUTIONS, Solutions.GenerateSolutions);

 Target(
-  TEST,
-  DependsOn(BUILD, CHECK_SOLUTIONS),
+  TEST_AFFECTED,
+  DependsOn(DETECT_AFFECTED, BUILD, CHECK_SOLUTIONS),
  async () =>
  {
    foreach (var s in await Affected.GetTestProjects())
@@ -192,14 +193,12 @@ Target(
  }
 );

-//all tests on purpose
 Target(
-  TEST_ONLY,
-  DependsOn(FORMAT),
+  TEST,
+  DependsOn(BUILD, CHECK_SOLUTIONS),
  Glob.Files(".", "**/*.Tests.csproj"),
  file =>
  {
-    Run("dotnet", $"build \"{file}\" -c Release --no-incremental");
    Run(
      "dotnet",
      $"test \"{file}\" -c Release --no-build --verbosity=minimal /p:AltCover=true /p:AltCoverAttributeFilter=ExcludeFromCodeCoverage /p:AltCoverVerbosity=Warning"
@@ -207,31 +206,28 @@ Target(
  }
 );

+Target(TEST_AND_PACK, DependsOn(TEST, PACK));
+
 Target(
-  BUILD_LINUX,
-  DependsOn(FORMAT),
-  Glob.Files(".", "**/Speckle.Importers.Ifc.csproj"),
-  async file =>
+  PACK,
+  DependsOn(BUILD),
+  Consts.Solutions,
+  async solution =>
  {
-    await RunAsync("dotnet", $"restore \"{file}\" --locked-mode");
    var version = await Versions.ComputeVersion();
    var fileVersion = await Versions.ComputeFileVersion();
    Console.WriteLine($"Version: {version} & {fileVersion}");
-    await RunAsync(
-      "dotnet",
-      $"build \"{file}\" -c Release --no-restore -warnaserror -p:Version={version} -p:FileVersion={fileVersion} -v:m"
-    );

    await RunAsync(
      "dotnet",
-      $"pack \"{file}\" -c Release -o output --no-build -p:Version={version} -p:FileVersion={fileVersion} -v:m"
+      $"pack \"{solution}\" -c Release -o output --no-build -p:Version={version} -p:FileVersion={fileVersion} -v:m"
    );
  }
 );

 Target(
  ZIP,
-  DependsOn(TEST),
+  DependsOn(TEST_AFFECTED),
  async () =>
  {
    var version = await Versions.ComputeVersion();
@@ -282,6 +278,6 @@ Target(
  }
 );

-Target("default", DependsOn(TEST), () => Console.WriteLine("Done!"));
+Target("default", DependsOn(TEST_AFFECTED), () => Console.WriteLine("Done!"));

 await RunTargetsAndExitAsync(args).ConfigureAwait(true);
@@ -16,12 +16,12 @@
      },
      "Microsoft.Build": {
        "type": "Direct",
-        "requested": "[17.11.4, )",
-        "resolved": "17.11.4",
-        "contentHash": "UMC7DfeFEHY2GGHHaghybUuUlLaByFHEFudR2PehMgDBuRuLAUePp1iaa4eFtVzepRzMtIbeSCVJCzzX3NV2Gg==",
+        "requested": "[17.11.48, )",
+        "resolved": "17.11.48",
+        "contentHash": "g8Kn575mNAKcuFotV3C7xvF+IbxuHennl67LH2shL2au1U6UqwReTDygCHyU04+koc2Yn7fHIbVQaC08HqEWow==",
        "dependencies": {
-          "Microsoft.Build.Framework": "17.11.4",
-          "Microsoft.NET.StringTools": "17.11.4",
+          "Microsoft.Build.Framework": "17.11.48",
+          "Microsoft.NET.StringTools": "17.11.48",
          "System.Collections.Immutable": "8.0.0",
          "System.Configuration.ConfigurationManager": "8.0.0",
          "System.Reflection.Metadata": "8.0.0",
@@ -82,8 +82,8 @@
      },
      "Microsoft.Build.Framework": {
        "type": "Transitive",
-        "resolved": "17.11.4",
-        "contentHash": "u28uDihlqxtt8h2dL1ZJOZ7TRkxBK+HGr+3FgQpILVo7Q7gErkw8mYW9R+RM5PtxvZTdYb/4MWDL66vdIsANBQ=="
+        "resolved": "17.11.48",
+        "contentHash": "C3WIMt2wBl4++NX3jSEpTq5KXBhvAV154R4JrYHkfy9JSBcXWiL0mkgpspk5xSdOj+fS/uz7zluIy6bMM1fkkQ=="
      },
      "Microsoft.Build.Tasks.Git": {
        "type": "Transitive",
@@ -97,8 +97,8 @@
      },
      "Microsoft.NET.StringTools": {
        "type": "Transitive",
-        "resolved": "17.11.4",
-        "contentHash": "mudqUHhNpeqIdJoUx2YDWZO/I9uEDYVowan89R6wsomfnUJQk6HteoQTlNjZDixhT2B4IXMkMtgZtoceIjLRmA=="
+        "resolved": "17.11.48",
+        "contentHash": "0IQo089IGBEC4jgtishauZMVr9ZxOWNiGKeDvyzZlvw7p2r253lJh6IJCLLFWXvZnVrVO5mnsYIPamxFPzM08w=="
      },
      "Microsoft.NETFramework.ReferenceAssemblies.net461": {
        "type": "Transitive",
@@ -259,9 +259,9 @@
        "dependencies": {
          "Microsoft.Extensions.DependencyInjection": "[2.2.0, )",
          "Speckle.Connectors.Logging": "[1.0.0, )",
-          "Speckle.Objects": "[3.5.4, )",
-          "Speckle.Sdk": "[3.5.4, )",
-          "Speckle.Sdk.Dependencies": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )",
+          "Speckle.Sdk": "[3.9.0, )",
+          "Speckle.Sdk.Dependencies": "[3.9.0, )"
        }
      },
      "speckle.connectors.dui": {
@@ -292,7 +292,7 @@
        "type": "Project",
        "dependencies": {
          "Microsoft.Extensions.Logging.Abstractions": "[2.2.0, )",
-          "Speckle.Objects": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )"
        }
      },
      "Microsoft.Extensions.DependencyInjection": {
@@ -336,18 +336,18 @@
      },
      "Speckle.Objects": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o7ex4+yHJYI8pJbsjNqw+D8r8WjkBoB5aK/GQlGJd/0zydrPxN4SMKS4arpRBR3CUD6JhtQMatScXZOrslGXQg==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "fAOUhScCfDFVVynvipczjyw9RZlOgPOo8aH5A7EDAwZiDuDdd4EsnrqBCSPlmuoPYzY7hsN+5mfRkfw2rB36Ig==",
        "dependencies": {
-          "Speckle.Sdk": "3.5.4"
+          "Speckle.Sdk": "3.9.0"
        }
      },
      "Speckle.Sdk": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o4bEJTz+OBI1koy9xqXSIq3UtUFCKtk6Btg82rdVM2aFMPT3ZoYVarG+ylPcUOHd684XpgGASxE6dIgXz2pvng==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "GtbvnySinrE6Canm6fVjyUOxs4G1bw0aRLs9oPVMdodOKc9TxIQjp1lzVBtr6Jli+nzIxtC86xP5J6r9tufnrQ==",
        "dependencies": {
          "GraphQL.Client": "6.0.0",
          "Microsoft.Bcl.AsyncInterfaces": "5.0.0",
@@ -357,14 +357,14 @@
          "Microsoft.Extensions.Logging": "2.2.0",
          "Speckle.DoubleNumerics": "4.1.0",
          "Speckle.Newtonsoft.Json": "13.0.2",
-          "Speckle.Sdk.Dependencies": "3.5.4"
+          "Speckle.Sdk.Dependencies": "3.9.0"
        }
      },
      "Speckle.Sdk.Dependencies": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "d0ZOHiK11Hq9r7YEkfTvVu33ygWtsrgysIWdCRAz6rdlcAgMCEkWVBoe3jDjxdmUy20TToaQlFKfMH4hTyzWXg=="
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "m/3i+DX/1McN8ig0CcjmHM1BcNmNxgmny/735sKntzzDw23wdo868eOOTrogzmDoYHTyc7J4IjK+GE7iAyWn/g=="
      }
    }
  }
@@ -259,9 +259,9 @@
        "dependencies": {
          "Microsoft.Extensions.DependencyInjection": "[2.2.0, )",
          "Speckle.Connectors.Logging": "[1.0.0, )",
-          "Speckle.Objects": "[3.5.4, )",
-          "Speckle.Sdk": "[3.5.4, )",
-          "Speckle.Sdk.Dependencies": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )",
+          "Speckle.Sdk": "[3.9.0, )",
+          "Speckle.Sdk.Dependencies": "[3.9.0, )"
        }
      },
      "speckle.connectors.dui": {
@@ -292,7 +292,7 @@
        "type": "Project",
        "dependencies": {
          "Microsoft.Extensions.Logging.Abstractions": "[2.2.0, )",
-          "Speckle.Objects": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )"
        }
      },
      "Microsoft.Extensions.DependencyInjection": {
@@ -336,18 +336,18 @@
      },
      "Speckle.Objects": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o7ex4+yHJYI8pJbsjNqw+D8r8WjkBoB5aK/GQlGJd/0zydrPxN4SMKS4arpRBR3CUD6JhtQMatScXZOrslGXQg==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "fAOUhScCfDFVVynvipczjyw9RZlOgPOo8aH5A7EDAwZiDuDdd4EsnrqBCSPlmuoPYzY7hsN+5mfRkfw2rB36Ig==",
        "dependencies": {
-          "Speckle.Sdk": "3.5.4"
+          "Speckle.Sdk": "3.9.0"
        }
      },
      "Speckle.Sdk": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o4bEJTz+OBI1koy9xqXSIq3UtUFCKtk6Btg82rdVM2aFMPT3ZoYVarG+ylPcUOHd684XpgGASxE6dIgXz2pvng==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "GtbvnySinrE6Canm6fVjyUOxs4G1bw0aRLs9oPVMdodOKc9TxIQjp1lzVBtr6Jli+nzIxtC86xP5J6r9tufnrQ==",
        "dependencies": {
          "GraphQL.Client": "6.0.0",
          "Microsoft.Bcl.AsyncInterfaces": "5.0.0",
@@ -357,14 +357,14 @@
          "Microsoft.Extensions.Logging": "2.2.0",
          "Speckle.DoubleNumerics": "4.1.0",
          "Speckle.Newtonsoft.Json": "13.0.2",
-          "Speckle.Sdk.Dependencies": "3.5.4"
+          "Speckle.Sdk.Dependencies": "3.9.0"
        }
      },
      "Speckle.Sdk.Dependencies": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "d0ZOHiK11Hq9r7YEkfTvVu33ygWtsrgysIWdCRAz6rdlcAgMCEkWVBoe3jDjxdmUy20TToaQlFKfMH4hTyzWXg=="
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "m/3i+DX/1McN8ig0CcjmHM1BcNmNxgmny/735sKntzzDw23wdo868eOOTrogzmDoYHTyc7J4IjK+GE7iAyWn/g=="
      }
    }
  }
@@ -259,9 +259,9 @@
        "dependencies": {
          "Microsoft.Extensions.DependencyInjection": "[2.2.0, )",
          "Speckle.Connectors.Logging": "[1.0.0, )",
-          "Speckle.Objects": "[3.5.4, )",
-          "Speckle.Sdk": "[3.5.4, )",
-          "Speckle.Sdk.Dependencies": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )",
+          "Speckle.Sdk": "[3.9.0, )",
+          "Speckle.Sdk.Dependencies": "[3.9.0, )"
        }
      },
      "speckle.connectors.dui": {
@@ -293,7 +293,7 @@
        "type": "Project",
        "dependencies": {
          "Microsoft.Extensions.Logging.Abstractions": "[2.2.0, )",
-          "Speckle.Objects": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )"
        }
      },
      "Microsoft.Extensions.DependencyInjection": {
@@ -337,18 +337,18 @@
      },
      "Speckle.Objects": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o7ex4+yHJYI8pJbsjNqw+D8r8WjkBoB5aK/GQlGJd/0zydrPxN4SMKS4arpRBR3CUD6JhtQMatScXZOrslGXQg==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "fAOUhScCfDFVVynvipczjyw9RZlOgPOo8aH5A7EDAwZiDuDdd4EsnrqBCSPlmuoPYzY7hsN+5mfRkfw2rB36Ig==",
        "dependencies": {
-          "Speckle.Sdk": "3.5.4"
+          "Speckle.Sdk": "3.9.0"
        }
      },
      "Speckle.Sdk": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o4bEJTz+OBI1koy9xqXSIq3UtUFCKtk6Btg82rdVM2aFMPT3ZoYVarG+ylPcUOHd684XpgGASxE6dIgXz2pvng==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "GtbvnySinrE6Canm6fVjyUOxs4G1bw0aRLs9oPVMdodOKc9TxIQjp1lzVBtr6Jli+nzIxtC86xP5J6r9tufnrQ==",
        "dependencies": {
          "GraphQL.Client": "6.0.0",
          "Microsoft.Bcl.AsyncInterfaces": "5.0.0",
@@ -358,14 +358,14 @@
          "Microsoft.Extensions.Logging": "2.2.0",
          "Speckle.DoubleNumerics": "4.1.0",
          "Speckle.Newtonsoft.Json": "13.0.2",
-          "Speckle.Sdk.Dependencies": "3.5.4"
+          "Speckle.Sdk.Dependencies": "3.9.0"
        }
      },
      "Speckle.Sdk.Dependencies": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "d0ZOHiK11Hq9r7YEkfTvVu33ygWtsrgysIWdCRAz6rdlcAgMCEkWVBoe3jDjxdmUy20TToaQlFKfMH4hTyzWXg=="
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "m/3i+DX/1McN8ig0CcjmHM1BcNmNxgmny/735sKntzzDw23wdo868eOOTrogzmDoYHTyc7J4IjK+GE7iAyWn/g=="
      }
    }
  }
@@ -210,9 +210,9 @@
        "dependencies": {
          "Microsoft.Extensions.DependencyInjection": "[2.2.0, )",
          "Speckle.Connectors.Logging": "[1.0.0, )",
-          "Speckle.Objects": "[3.5.4, )",
-          "Speckle.Sdk": "[3.5.4, )",
-          "Speckle.Sdk.Dependencies": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )",
+          "Speckle.Sdk": "[3.9.0, )",
+          "Speckle.Sdk.Dependencies": "[3.9.0, )"
        }
      },
      "speckle.connectors.dui": {
@@ -244,7 +244,7 @@
        "type": "Project",
        "dependencies": {
          "Microsoft.Extensions.Logging.Abstractions": "[2.2.0, )",
-          "Speckle.Objects": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )"
        }
      },
      "Microsoft.Extensions.DependencyInjection": {
@@ -288,18 +288,18 @@
      },
      "Speckle.Objects": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o7ex4+yHJYI8pJbsjNqw+D8r8WjkBoB5aK/GQlGJd/0zydrPxN4SMKS4arpRBR3CUD6JhtQMatScXZOrslGXQg==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "fAOUhScCfDFVVynvipczjyw9RZlOgPOo8aH5A7EDAwZiDuDdd4EsnrqBCSPlmuoPYzY7hsN+5mfRkfw2rB36Ig==",
        "dependencies": {
-          "Speckle.Sdk": "3.5.4"
+          "Speckle.Sdk": "3.9.0"
        }
      },
      "Speckle.Sdk": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o4bEJTz+OBI1koy9xqXSIq3UtUFCKtk6Btg82rdVM2aFMPT3ZoYVarG+ylPcUOHd684XpgGASxE6dIgXz2pvng==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "GtbvnySinrE6Canm6fVjyUOxs4G1bw0aRLs9oPVMdodOKc9TxIQjp1lzVBtr6Jli+nzIxtC86xP5J6r9tufnrQ==",
        "dependencies": {
          "GraphQL.Client": "6.0.0",
          "Microsoft.Data.Sqlite": "7.0.5",
@@ -307,14 +307,14 @@
          "Microsoft.Extensions.Logging": "2.2.0",
          "Speckle.DoubleNumerics": "4.1.0",
          "Speckle.Newtonsoft.Json": "13.0.2",
-          "Speckle.Sdk.Dependencies": "3.5.4"
+          "Speckle.Sdk.Dependencies": "3.9.0"
        }
      },
      "Speckle.Sdk.Dependencies": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "d0ZOHiK11Hq9r7YEkfTvVu33ygWtsrgysIWdCRAz6rdlcAgMCEkWVBoe3jDjxdmUy20TToaQlFKfMH4hTyzWXg=="
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "m/3i+DX/1McN8ig0CcjmHM1BcNmNxgmny/735sKntzzDw23wdo868eOOTrogzmDoYHTyc7J4IjK+GE7iAyWn/g=="
      }
    },
    "net8.0-windows7.0/win-x64": {
@@ -210,9 +210,9 @@
        "dependencies": {
          "Microsoft.Extensions.DependencyInjection": "[2.2.0, )",
          "Speckle.Connectors.Logging": "[1.0.0, )",
-          "Speckle.Objects": "[3.5.4, )",
-          "Speckle.Sdk": "[3.5.4, )",
-          "Speckle.Sdk.Dependencies": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )",
+          "Speckle.Sdk": "[3.9.0, )",
+          "Speckle.Sdk.Dependencies": "[3.9.0, )"
        }
      },
      "speckle.connectors.dui": {
@@ -244,7 +244,7 @@
        "type": "Project",
        "dependencies": {
          "Microsoft.Extensions.Logging.Abstractions": "[2.2.0, )",
-          "Speckle.Objects": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )"
        }
      },
      "Microsoft.Extensions.DependencyInjection": {
@@ -288,18 +288,18 @@
      },
      "Speckle.Objects": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o7ex4+yHJYI8pJbsjNqw+D8r8WjkBoB5aK/GQlGJd/0zydrPxN4SMKS4arpRBR3CUD6JhtQMatScXZOrslGXQg==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "fAOUhScCfDFVVynvipczjyw9RZlOgPOo8aH5A7EDAwZiDuDdd4EsnrqBCSPlmuoPYzY7hsN+5mfRkfw2rB36Ig==",
        "dependencies": {
-          "Speckle.Sdk": "3.5.4"
+          "Speckle.Sdk": "3.9.0"
        }
      },
      "Speckle.Sdk": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o4bEJTz+OBI1koy9xqXSIq3UtUFCKtk6Btg82rdVM2aFMPT3ZoYVarG+ylPcUOHd684XpgGASxE6dIgXz2pvng==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "GtbvnySinrE6Canm6fVjyUOxs4G1bw0aRLs9oPVMdodOKc9TxIQjp1lzVBtr6Jli+nzIxtC86xP5J6r9tufnrQ==",
        "dependencies": {
          "GraphQL.Client": "6.0.0",
          "Microsoft.Data.Sqlite": "7.0.5",
@@ -307,14 +307,14 @@
          "Microsoft.Extensions.Logging": "2.2.0",
          "Speckle.DoubleNumerics": "4.1.0",
          "Speckle.Newtonsoft.Json": "13.0.2",
-          "Speckle.Sdk.Dependencies": "3.5.4"
+          "Speckle.Sdk.Dependencies": "3.9.0"
        }
      },
      "Speckle.Sdk.Dependencies": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "d0ZOHiK11Hq9r7YEkfTvVu33ygWtsrgysIWdCRAz6rdlcAgMCEkWVBoe3jDjxdmUy20TToaQlFKfMH4hTyzWXg=="
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "m/3i+DX/1McN8ig0CcjmHM1BcNmNxgmny/735sKntzzDw23wdo868eOOTrogzmDoYHTyc7J4IjK+GE7iAyWn/g=="
      }
    },
    "net8.0-windows7.0/win-x64": {
@@ -0,0 +1,296 @@
+using Autodesk.AutoCAD.DatabaseServices;
+using Speckle.Connectors.Autocad.HostApp;
+using Speckle.Connectors.Autocad.HostApp.Extensions;
+using Speckle.Connectors.Common.Builders;
+using Speckle.Connectors.Common.Conversion;
+using Speckle.Connectors.Common.Extensions;
+using Speckle.Connectors.Common.Operations;
+using Speckle.Connectors.Common.Operations.Receive;
+using Speckle.Converters.Common;
+using Speckle.Sdk.Common;
+using Speckle.Sdk.Dependencies;
+using Speckle.Sdk.Models;
+using Speckle.Sdk.Models.Collections;
+using Speckle.Sdk.Models.Instances;
+using AutocadColor = Autodesk.AutoCAD.Colors.Color;
+
+namespace Speckle.Connectors.Autocad.Operations.Receive;
+
+/// <summary>
+/// <para>Base class for AutoCAD host object builders. Expects to be a scoped dependency per receive operation.</para>
+/// </summary>
+public abstract class AutocadHostObjectBaseBuilder : IHostObjectBuilder
+{
+  private readonly IRootToHostConverter _converter;
+  private readonly AutocadLayerBaker _layerBaker;
+  private readonly AutocadGroupBaker _groupBaker;
+  private readonly AutocadInstanceBaker _instanceBaker;
+  private readonly IAutocadMaterialBaker _materialBaker;
+  private readonly IAutocadColorBaker _colorBaker;
+  private readonly AutocadContext _autocadContext;
+  private readonly RootObjectUnpacker _rootObjectUnpacker;
+  private readonly IReceiveConversionHandler _conversionHandler;
+
+  protected AutocadHostObjectBaseBuilder(
+    IRootToHostConverter converter,
+    AutocadLayerBaker layerBaker,
+    AutocadGroupBaker groupBaker,
+    AutocadInstanceBaker instanceBaker,
+    IAutocadMaterialBaker materialBaker,
+    IAutocadColorBaker colorBaker,
+    AutocadContext autocadContext,
+    RootObjectUnpacker rootObjectUnpacker,
+    IReceiveConversionHandler conversionHandler
+  )
+  {
+    _converter = converter;
+    _layerBaker = layerBaker;
+    _groupBaker = groupBaker;
+    _instanceBaker = instanceBaker;
+    _materialBaker = materialBaker;
+    _colorBaker = colorBaker;
+    _autocadContext = autocadContext;
+    _rootObjectUnpacker = rootObjectUnpacker;
+    _conversionHandler = conversionHandler;
+  }
+
+  public Task<HostObjectBuilderResult> Build(
+    Base rootObject,
+    string projectName,
+    string modelName,
+    IProgress<CardProgress> onOperationProgressed,
+    CancellationToken cancellationToken
+  )
+  {
+    // Prompt the UI conversion started. Progress bar will swoosh.
+    onOperationProgressed.Report(new("Converting", null));
+
+    // Layer filter for received commit with project and model name
+    _layerBaker.CreateLayerFilter(projectName, modelName);
+
+    // 0 - Clean then Rock n Roll!
+    string baseLayerPrefix = _autocadContext.RemoveInvalidChars($"SPK-{projectName}-{modelName}-");
+    PreReceiveDeepClean(baseLayerPrefix);
+
+    // 1 - Unpack objects and proxies from root commit object
+    var unpackedRoot = _rootObjectUnpacker.Unpack(rootObject);
+
+    // 2 - Split atomic objects and instance components with their path
+    var (atomicObjects, instanceComponents) = _rootObjectUnpacker.SplitAtomicObjectsAndInstances(
+      unpackedRoot.ObjectsToConvert
+    );
+    var atomicObjectsWithPath = _layerBaker.GetAtomicObjectsWithPath(atomicObjects);
+    var instanceComponentsWithPath = _layerBaker.GetInstanceComponentsWithPath(instanceComponents);
+
+    // POC: these are not captured by traversal, so we need to re-add them here
+    if (unpackedRoot.DefinitionProxies != null && unpackedRoot.DefinitionProxies.Count > 0)
+    {
+      var transformed = unpackedRoot.DefinitionProxies.Select(proxy =>
+        (Array.Empty<Collection>(), proxy as IInstanceComponent)
+      );
+      instanceComponentsWithPath.AddRange(transformed);
+    }
+
+    // 3 - Parse and bake proxies (materials and colors), as they are used later down the line by layers and objects
+    if (unpackedRoot.RenderMaterialProxies != null)
+    {
+      _materialBaker.ParseAndBakeRenderMaterials(
+        unpackedRoot.RenderMaterialProxies,
+        baseLayerPrefix,
+        onOperationProgressed
+      );
+    }
+
+    if (unpackedRoot.ColorProxies != null)
+    {
+      _colorBaker.ParseColors(unpackedRoot.ColorProxies, onOperationProgressed);
+    }
+
+    // 3.5 - Parse and bake additional proxies that are needed for conversion
+    ParseAndBakeAdditionalProxies(rootObject, baseLayerPrefix);
+
+    // 4 - Convert atomic objects
+    HashSet<ReceiveConversionResult> results = new();
+    HashSet<string> bakedObjectIds = new();
+    Dictionary<string, IReadOnlyCollection<Entity>> applicationIdMap = new();
+    var count = 0;
+    foreach (var (layerPath, atomicObject) in atomicObjectsWithPath)
+    {
+      onOperationProgressed.Report(new("Converting objects", (double)++count / atomicObjects.Count));
+      var ex = _conversionHandler.TryConvert(() =>
+      {
+        cancellationToken.ThrowIfCancellationRequested();
+        string objectId = atomicObject.applicationId ?? atomicObject.id.NotNull();
+        IReadOnlyCollection<Entity> convertedObjects = ConvertObject(atomicObject, layerPath, baseLayerPrefix);
+
+        applicationIdMap[objectId] = convertedObjects;
+
+        results.UnionWith(
+          convertedObjects.Select(e => new ReceiveConversionResult(
+            Status.SUCCESS,
+            atomicObject,
+            e.GetSpeckleApplicationId(),
+            e.GetType().ToString()
+          ))
+        );
+
+        bakedObjectIds.UnionWith(convertedObjects.Select(e => e.GetSpeckleApplicationId()));
+      });
+      if (ex != null)
+      {
+        results.Add(new(Status.ERROR, atomicObject, null, null, ex));
+      }
+    }
+
+    // 5 - Convert instances
+    var (createdInstanceIds, consumedObjectIds, instanceConversionResults) = _instanceBaker.BakeInstances(
+      instanceComponentsWithPath,
+      applicationIdMap,
+      baseLayerPrefix,
+      onOperationProgressed
+    );
+
+    bakedObjectIds.RemoveWhere(id => consumedObjectIds.Contains(id));
+    bakedObjectIds.UnionWith(createdInstanceIds);
+    results.RemoveWhere(result => result.ResultId != null && consumedObjectIds.Contains(result.ResultId));
+    results.UnionWith(instanceConversionResults);
+
+    // 6 - Create groups
+    if (unpackedRoot.GroupProxies != null)
+    {
+      IReadOnlyCollection<ReceiveConversionResult> groupResults = _groupBaker.CreateGroups(
+        unpackedRoot.GroupProxies,
+        applicationIdMap
+      );
+      results.UnionWith(groupResults);
+    }
+
+    return Task.FromResult(new HostObjectBuilderResult(bakedObjectIds, results));
+  }
+
+  protected void PreReceiveDeepClean(string baseLayerPrefix)
+  {
+    _layerBaker.DeleteAllLayersByPrefix(baseLayerPrefix);
+    _instanceBaker.PurgeInstances(baseLayerPrefix);
+    _materialBaker.PurgeMaterials(baseLayerPrefix);
+    PreReceiveAdditionalDeepClean(baseLayerPrefix);
+  }
+
+  /// <summary>
+  /// Method for adding app-specific additional deep clean of the document prior to receiving.
+  /// </summary>
+  protected virtual void PreReceiveAdditionalDeepClean(string baseLayerPrefix) { }
+
+  /// <summary>
+  /// Method for parsing and baking additional app-specific proxies on the root prior to converting and baking objects
+  /// </summary>
+  protected virtual void ParseAndBakeAdditionalProxies(Base rootObject, string baseLayerPrefix) { }
+
+  private IReadOnlyCollection<Entity> ConvertObject(Base obj, Collection[] layerPath, string baseLayerNamePrefix)
+  {
+    string layerName = _layerBaker.CreateLayerForReceive(layerPath, baseLayerNamePrefix);
+    var convertedEntities = new HashSet<Entity>();
+
+    using var tr = Application.DocumentManager.CurrentDocument.Database.TransactionManager.StartTransaction();
+
+    // 1: convert
+    var converted = _converter.Convert(obj);
+
+    // 2: handle result
+    switch (converted)
+    {
+      case Entity entity:
+        var bakedEntity = BakeObject(entity, obj, layerName, tr);
+        convertedEntities.Add(bakedEntity);
+        break;
+
+      case List<(Entity, Base)> listConversionResult: // this is from fallback conversion for brep/brepx/subdx/extrusionx/polycurve
+        var bakedFallbackEntities = BakeObjectsAsGroup(listConversionResult, obj, layerName, baseLayerNamePrefix, tr);
+        convertedEntities.UnionWith(bakedFallbackEntities);
+        break;
+
+      default:
+        // TODO: capture defualt case with report object here? Same as in Rhino
+        break;
+    }
+
+    tr.Commit();
+    return convertedEntities.Freeze();
+  }
+
+  private Entity BakeObject(
+    Entity entity,
+    Base originalObject,
+    string layerName,
+    Transaction tr,
+    Base? parentObject = null
+  )
+  {
+    var objId = originalObject.applicationId ?? originalObject.id.NotNull();
+    if (_colorBaker.ObjectColorsIdMap.TryGetValue(objId, out AutocadColor? color))
+    {
+      entity.Color = color;
+    }
+
+    if (_materialBaker.TryGetMaterialId(originalObject, parentObject, out ObjectId matId))
+    {
+      entity.MaterialId = matId;
+    }
+
+    entity.AppendToDb(layerName);
+
+    // Hook for derived classes to perform additional operations after entity is added to database
+    PostBakeEntity(entity, originalObject, tr);
+
+    return entity;
+  }
+
+  /// <summary>
+  /// Method for additional app-specific operations on entities after the entity has been added to the document database.
+  /// Called after the entity is added to the database in an open transaction
+  /// </summary>
+  /// <param name="entity"></param>
+  /// <param name="originalObject"></param>
+  /// <param name="tr"></param>
+  protected virtual void PostBakeEntity(Entity entity, Base originalObject, Transaction tr)
+  {
+    // Default implementation does nothing - override in derived classes
+  }
+
+  private List<Entity> BakeObjectsAsGroup(
+    List<(Entity, Base)> fallbackConversionResult,
+    Base parentObject,
+    string layerName,
+    string baseLayerName,
+    Transaction tr
+  )
+  {
+    var ids = new ObjectIdCollection();
+    var entities = new List<Entity>();
+    foreach (var (conversionResult, originalObject) in fallbackConversionResult)
+    {
+      BakeObject(conversionResult, originalObject, layerName, tr, parentObject);
+      ids.Add(conversionResult.ObjectId);
+      entities.Add(conversionResult);
+    }
+
+    if (entities.Count <= 1) // return if empty list or only one, because we don't want to create empty or single item groups.
+    {
+      return entities;
+    }
+    var groupDictionary = (DBDictionary)
+      tr.GetObject(Application.DocumentManager.CurrentDocument.Database.GroupDictionaryId, OpenMode.ForWrite);
+
+    var groupName = _autocadContext.RemoveInvalidChars(
+      $@"{parentObject.speckle_type.Split('.').Last()} - {parentObject.applicationId ?? parentObject.id}  ({baseLayerName})"
+    );
+
+    var newGroup = new Group(groupName, true);
+    newGroup.Append(ids);
+    groupDictionary.UpgradeOpen();
+    groupDictionary.SetAt(groupName, newGroup);
+    tr.AddNewlyCreatedDBObject(newGroup, true);
+
+    return entities;
+  }
+}
@@ -1,238 +1,35 @@
-using Autodesk.AutoCAD.DatabaseServices;
 using Speckle.Connectors.Autocad.HostApp;
-using Speckle.Connectors.Autocad.HostApp.Extensions;
-using Speckle.Connectors.Common.Builders;
-using Speckle.Connectors.Common.Conversion;
-using Speckle.Connectors.Common.Extensions;
 using Speckle.Connectors.Common.Operations;
 using Speckle.Connectors.Common.Operations.Receive;
 using Speckle.Converters.Common;
-using Speckle.Sdk.Common;
-using Speckle.Sdk.Dependencies;
-using Speckle.Sdk.Models;
-using Speckle.Sdk.Models.Collections;
-using Speckle.Sdk.Models.Instances;
-using AutocadColor = Autodesk.AutoCAD.Colors.Color;

 namespace Speckle.Connectors.Autocad.Operations.Receive;

 /// <summary>
-/// <para>Expects to be a scoped dependency per receive operation.</para>
+/// <para>AutoCAD-specific host object builder. Expects to be a scoped dependency per receive operation.</para>
 /// </summary>
-public class AutocadHostObjectBuilder(
-  IRootToHostConverter converter,
-  AutocadLayerBaker layerBaker,
-  AutocadGroupBaker groupBaker,
-  AutocadInstanceBaker instanceBaker,
-  IAutocadMaterialBaker materialBaker,
-  IAutocadColorBaker colorBaker,
-  AutocadContext autocadContext,
-  RootObjectUnpacker rootObjectUnpacker,
-  IReceiveConversionHandler conversionHandler
-) : IHostObjectBuilder
+public sealed class AutocadHostObjectBuilder : AutocadHostObjectBaseBuilder
 {
-  public Task<HostObjectBuilderResult> Build(
-    Base rootObject,
-    string projectName,
-    string modelName,
-    IProgress<CardProgress> onOperationProgressed,
-    CancellationToken cancellationToken
+  public AutocadHostObjectBuilder(
+    IRootToHostConverter converter,
+    AutocadLayerBaker layerBaker,
+    AutocadGroupBaker groupBaker,
+    AutocadInstanceBaker instanceBaker,
+    IAutocadMaterialBaker materialBaker,
+    IAutocadColorBaker colorBaker,
+    AutocadContext autocadContext,
+    RootObjectUnpacker rootObjectUnpacker,
+    IReceiveConversionHandler conversionHandler
  )
-  {
-    // Prompt the UI conversion started. Progress bar will swoosh.
-    onOperationProgressed.Report(new("Converting", null));
-
-    // Layer filter for received commit with project and model name
-    layerBaker.CreateLayerFilter(projectName, modelName);
-
-    // 0 - Clean then Rock n Roll!
-    string baseLayerPrefix = autocadContext.RemoveInvalidChars($"SPK-{projectName}-{modelName}-");
-    PreReceiveDeepClean(baseLayerPrefix);
-
-    // 1 - Unpack objects and proxies from root commit object
-    var unpackedRoot = rootObjectUnpacker.Unpack(rootObject);
-
-    // 2 - Split atomic objects and instance components with their path
-    var (atomicObjects, instanceComponents) = rootObjectUnpacker.SplitAtomicObjectsAndInstances(
-      unpackedRoot.ObjectsToConvert
-    );
-    var atomicObjectsWithPath = layerBaker.GetAtomicObjectsWithPath(atomicObjects);
-    var instanceComponentsWithPath = layerBaker.GetInstanceComponentsWithPath(instanceComponents);
-
-    // POC: these are not captured by traversal, so we need to re-add them here
-    if (unpackedRoot.DefinitionProxies != null && unpackedRoot.DefinitionProxies.Count > 0)
-    {
-      var transformed = unpackedRoot.DefinitionProxies.Select(proxy =>
-        (Array.Empty<Collection>(), proxy as IInstanceComponent)
-      );
-      instanceComponentsWithPath.AddRange(transformed);
-    }
-
-    // 3 - Bake materials and colors, as they are used later down the line by layers and objects
-    if (unpackedRoot.RenderMaterialProxies != null)
-    {
-      materialBaker.ParseAndBakeRenderMaterials(
-        unpackedRoot.RenderMaterialProxies,
-        baseLayerPrefix,
-        onOperationProgressed
-      );
-    }
-
-    if (unpackedRoot.ColorProxies != null)
-    {
-      colorBaker.ParseColors(unpackedRoot.ColorProxies, onOperationProgressed);
-    }
-
-    // 4 - Convert atomic objects
-    HashSet<ReceiveConversionResult> results = new();
-    HashSet<string> bakedObjectIds = new();
-    Dictionary<string, IReadOnlyCollection<Entity>> applicationIdMap = new();
-    var count = 0;
-    foreach (var (layerPath, atomicObject) in atomicObjectsWithPath)
-    {
-      onOperationProgressed.Report(new("Converting objects", (double)++count / atomicObjects.Count));
-      var ex = conversionHandler.TryConvert(() =>
-      {
-        cancellationToken.ThrowIfCancellationRequested();
-        string objectId = atomicObject.applicationId ?? atomicObject.id.NotNull();
-        IReadOnlyCollection<Entity> convertedObjects = ConvertObject(atomicObject, layerPath, baseLayerPrefix);
-
-        applicationIdMap[objectId] = convertedObjects;
-
-        results.UnionWith(
-          convertedObjects.Select(e => new ReceiveConversionResult(
-            Status.SUCCESS,
-            atomicObject,
-            e.GetSpeckleApplicationId(),
-            e.GetType().ToString()
-          ))
-        );
-
-        bakedObjectIds.UnionWith(convertedObjects.Select(e => e.GetSpeckleApplicationId()));
-      });
-      if (ex != null)
-      {
-        results.Add(new(Status.ERROR, atomicObject, null, null, ex));
-      }
-    }
-
-    // 5 - Convert instances
-    var (createdInstanceIds, consumedObjectIds, instanceConversionResults) = instanceBaker.BakeInstances(
-      instanceComponentsWithPath,
-      applicationIdMap,
-      baseLayerPrefix,
-      onOperationProgressed
-    );
-
-    bakedObjectIds.RemoveWhere(id => consumedObjectIds.Contains(id));
-    bakedObjectIds.UnionWith(createdInstanceIds);
-    results.RemoveWhere(result => result.ResultId != null && consumedObjectIds.Contains(result.ResultId));
-    results.UnionWith(instanceConversionResults);
-
-    // 6 - Create groups
-    if (unpackedRoot.GroupProxies != null)
-    {
-      IReadOnlyCollection<ReceiveConversionResult> groupResults = groupBaker.CreateGroups(
-        unpackedRoot.GroupProxies,
-        applicationIdMap
-      );
-      results.UnionWith(groupResults);
-    }
-
-    return Task.FromResult(new HostObjectBuilderResult(bakedObjectIds, results));
-  }
-
-  private void PreReceiveDeepClean(string baseLayerPrefix)
-  {
-    layerBaker.DeleteAllLayersByPrefix(baseLayerPrefix);
-    instanceBaker.PurgeInstances(baseLayerPrefix);
-    materialBaker.PurgeMaterials(baseLayerPrefix);
-  }
-
-  private IReadOnlyCollection<Entity> ConvertObject(Base obj, Collection[] layerPath, string baseLayerNamePrefix)
-  {
-    string layerName = layerBaker.CreateLayerForReceive(layerPath, baseLayerNamePrefix);
-    var convertedEntities = new HashSet<Entity>();
-
-    using var tr = Application.DocumentManager.CurrentDocument.Database.TransactionManager.StartTransaction();
-
-    // 1: convert
-    var converted = converter.Convert(obj);
-
-    // 2: handle result
-    switch (converted)
-    {
-      case Entity entity:
-        var bakedEntity = BakeObject(entity, obj, layerName);
-        convertedEntities.Add(bakedEntity);
-        break;
-
-      case List<(Entity, Base)> listConversionResult: // this is from fallback conversion for brep/brepx/subdx/extrusionx/polycurve
-        var bakedFallbackEntities = BakeObjectsAsGroup(listConversionResult, obj, layerName, baseLayerNamePrefix);
-        convertedEntities.UnionWith(bakedFallbackEntities);
-        break;
-
-      default:
-        // TODO: capture defualt case with report object here? Same as in Rhino
-        break;
-    }
-
-    tr.Commit();
-    return convertedEntities.Freeze();
-  }
-
-  private Entity BakeObject(Entity entity, Base originalObject, string layerName, Base? parentObject = null)
-  {
-    var objId = originalObject.applicationId ?? originalObject.id.NotNull();
-    if (colorBaker.ObjectColorsIdMap.TryGetValue(objId, out AutocadColor? color))
-    {
-      entity.Color = color;
-    }
-
-    if (materialBaker.TryGetMaterialId(originalObject, parentObject, out ObjectId matId))
-    {
-      entity.MaterialId = matId;
-    }
-
-    entity.AppendToDb(layerName);
-    return entity;
-  }
-
-  private List<Entity> BakeObjectsAsGroup(
-    List<(Entity, Base)> fallbackConversionResult,
-    Base parentObject,
-    string layerName,
-    string baseLayerName
-  )
-  {
-    var ids = new ObjectIdCollection();
-    var entities = new List<Entity>();
-    foreach (var (conversionResult, originalObject) in fallbackConversionResult)
-    {
-      BakeObject(conversionResult, originalObject, layerName, parentObject);
-      ids.Add(conversionResult.ObjectId);
-      entities.Add(conversionResult);
-    }
-
-    if (entities.Count <= 1) // return if empty list or only one, because we don't want to create empty or single item groups.
-    {
-      return entities;
-    }
-
-    var tr = Application.DocumentManager.CurrentDocument.Database.TransactionManager.TopTransaction;
-    var groupDictionary = (DBDictionary)
-      tr.GetObject(Application.DocumentManager.CurrentDocument.Database.GroupDictionaryId, OpenMode.ForWrite);
-
-    var groupName = autocadContext.RemoveInvalidChars(
-      $@"{parentObject.speckle_type.Split('.').Last()} - {parentObject.applicationId ?? parentObject.id}  ({baseLayerName})"
-    );
-
-    var newGroup = new Group(groupName, true);
-    newGroup.Append(ids);
-    groupDictionary.UpgradeOpen();
-    groupDictionary.SetAt(groupName, newGroup);
-    tr.AddNewlyCreatedDBObject(newGroup, true);
-
-    return entities;
-  }
+    : base(
+      converter,
+      layerBaker,
+      groupBaker,
+      instanceBaker,
+      materialBaker,
+      colorBaker,
+      autocadContext,
+      rootObjectUnpacker,
+      conversionHandler
+    ) { }
 }
@@ -38,6 +38,7 @@
    <Compile Include="$(MSBuildThisFileDirectory)HostApp\Extensions\EntityExtensions.cs" />
    <Compile Include="$(MSBuildThisFileDirectory)HostApp\Extensions\SpeckleApplicationIdExtensions.cs" />
    <Compile Include="$(MSBuildThisFileDirectory)HostApp\TransactionContext.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Operations\Receive\AutocadHostObjectBaseBuilder.cs" />
    <Compile Include="$(MSBuildThisFileDirectory)Operations\Receive\AutocadHostObjectBuilder.cs" />
    <Compile Include="$(MSBuildThisFileDirectory)Operations\Send\AutocadRootObject.cs" />
    <Compile Include="$(MSBuildThisFileDirectory)Operations\Send\AutocadRootObjectBaseBuilder.cs" />
@@ -268,9 +268,9 @@
        "dependencies": {
          "Microsoft.Extensions.DependencyInjection": "[2.2.0, )",
          "Speckle.Connectors.Logging": "[1.0.0, )",
-          "Speckle.Objects": "[3.5.4, )",
-          "Speckle.Sdk": "[3.5.4, )",
-          "Speckle.Sdk.Dependencies": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )",
+          "Speckle.Sdk": "[3.9.0, )",
+          "Speckle.Sdk.Dependencies": "[3.9.0, )"
        }
      },
      "speckle.connectors.dui": {
@@ -302,7 +302,7 @@
        "type": "Project",
        "dependencies": {
          "Microsoft.Extensions.Logging.Abstractions": "[2.2.0, )",
-          "Speckle.Objects": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )"
        }
      },
      "Microsoft.Extensions.DependencyInjection": {
@@ -346,18 +346,18 @@
      },
      "Speckle.Objects": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o7ex4+yHJYI8pJbsjNqw+D8r8WjkBoB5aK/GQlGJd/0zydrPxN4SMKS4arpRBR3CUD6JhtQMatScXZOrslGXQg==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "fAOUhScCfDFVVynvipczjyw9RZlOgPOo8aH5A7EDAwZiDuDdd4EsnrqBCSPlmuoPYzY7hsN+5mfRkfw2rB36Ig==",
        "dependencies": {
-          "Speckle.Sdk": "3.5.4"
+          "Speckle.Sdk": "3.9.0"
        }
      },
      "Speckle.Sdk": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o4bEJTz+OBI1koy9xqXSIq3UtUFCKtk6Btg82rdVM2aFMPT3ZoYVarG+ylPcUOHd684XpgGASxE6dIgXz2pvng==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "GtbvnySinrE6Canm6fVjyUOxs4G1bw0aRLs9oPVMdodOKc9TxIQjp1lzVBtr6Jli+nzIxtC86xP5J6r9tufnrQ==",
        "dependencies": {
          "GraphQL.Client": "6.0.0",
          "Microsoft.Bcl.AsyncInterfaces": "5.0.0",
@@ -367,14 +367,14 @@
          "Microsoft.Extensions.Logging": "2.2.0",
          "Speckle.DoubleNumerics": "4.1.0",
          "Speckle.Newtonsoft.Json": "13.0.2",
-          "Speckle.Sdk.Dependencies": "3.5.4"
+          "Speckle.Sdk.Dependencies": "3.9.0"
        }
      },
      "Speckle.Sdk.Dependencies": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "d0ZOHiK11Hq9r7YEkfTvVu33ygWtsrgysIWdCRAz6rdlcAgMCEkWVBoe3jDjxdmUy20TToaQlFKfMH4hTyzWXg=="
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "m/3i+DX/1McN8ig0CcjmHM1BcNmNxgmny/735sKntzzDw23wdo868eOOTrogzmDoYHTyc7J4IjK+GE7iAyWn/g=="
      }
    }
  }
@@ -268,9 +268,9 @@
        "dependencies": {
          "Microsoft.Extensions.DependencyInjection": "[2.2.0, )",
          "Speckle.Connectors.Logging": "[1.0.0, )",
-          "Speckle.Objects": "[3.5.4, )",
-          "Speckle.Sdk": "[3.5.4, )",
-          "Speckle.Sdk.Dependencies": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )",
+          "Speckle.Sdk": "[3.9.0, )",
+          "Speckle.Sdk.Dependencies": "[3.9.0, )"
        }
      },
      "speckle.connectors.dui": {
@@ -302,7 +302,7 @@
        "type": "Project",
        "dependencies": {
          "Microsoft.Extensions.Logging.Abstractions": "[2.2.0, )",
-          "Speckle.Objects": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )"
        }
      },
      "Microsoft.Extensions.DependencyInjection": {
@@ -346,18 +346,18 @@
      },
      "Speckle.Objects": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o7ex4+yHJYI8pJbsjNqw+D8r8WjkBoB5aK/GQlGJd/0zydrPxN4SMKS4arpRBR3CUD6JhtQMatScXZOrslGXQg==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "fAOUhScCfDFVVynvipczjyw9RZlOgPOo8aH5A7EDAwZiDuDdd4EsnrqBCSPlmuoPYzY7hsN+5mfRkfw2rB36Ig==",
        "dependencies": {
-          "Speckle.Sdk": "3.5.4"
+          "Speckle.Sdk": "3.9.0"
        }
      },
      "Speckle.Sdk": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o4bEJTz+OBI1koy9xqXSIq3UtUFCKtk6Btg82rdVM2aFMPT3ZoYVarG+ylPcUOHd684XpgGASxE6dIgXz2pvng==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "GtbvnySinrE6Canm6fVjyUOxs4G1bw0aRLs9oPVMdodOKc9TxIQjp1lzVBtr6Jli+nzIxtC86xP5J6r9tufnrQ==",
        "dependencies": {
          "GraphQL.Client": "6.0.0",
          "Microsoft.Bcl.AsyncInterfaces": "5.0.0",
@@ -367,14 +367,14 @@
          "Microsoft.Extensions.Logging": "2.2.0",
          "Speckle.DoubleNumerics": "4.1.0",
          "Speckle.Newtonsoft.Json": "13.0.2",
-          "Speckle.Sdk.Dependencies": "3.5.4"
+          "Speckle.Sdk.Dependencies": "3.9.0"
        }
      },
      "Speckle.Sdk.Dependencies": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "d0ZOHiK11Hq9r7YEkfTvVu33ygWtsrgysIWdCRAz6rdlcAgMCEkWVBoe3jDjxdmUy20TToaQlFKfMH4hTyzWXg=="
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "m/3i+DX/1McN8ig0CcjmHM1BcNmNxgmny/735sKntzzDw23wdo868eOOTrogzmDoYHTyc7J4IjK+GE7iAyWn/g=="
      }
    }
  }
@@ -268,9 +268,9 @@
        "dependencies": {
          "Microsoft.Extensions.DependencyInjection": "[2.2.0, )",
          "Speckle.Connectors.Logging": "[1.0.0, )",
-          "Speckle.Objects": "[3.5.4, )",
-          "Speckle.Sdk": "[3.5.4, )",
-          "Speckle.Sdk.Dependencies": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )",
+          "Speckle.Sdk": "[3.9.0, )",
+          "Speckle.Sdk.Dependencies": "[3.9.0, )"
        }
      },
      "speckle.connectors.dui": {
@@ -302,7 +302,7 @@
        "type": "Project",
        "dependencies": {
          "Microsoft.Extensions.Logging.Abstractions": "[2.2.0, )",
-          "Speckle.Objects": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )"
        }
      },
      "Microsoft.Extensions.DependencyInjection": {
@@ -346,18 +346,18 @@
      },
      "Speckle.Objects": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o7ex4+yHJYI8pJbsjNqw+D8r8WjkBoB5aK/GQlGJd/0zydrPxN4SMKS4arpRBR3CUD6JhtQMatScXZOrslGXQg==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "fAOUhScCfDFVVynvipczjyw9RZlOgPOo8aH5A7EDAwZiDuDdd4EsnrqBCSPlmuoPYzY7hsN+5mfRkfw2rB36Ig==",
        "dependencies": {
-          "Speckle.Sdk": "3.5.4"
+          "Speckle.Sdk": "3.9.0"
        }
      },
      "Speckle.Sdk": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o4bEJTz+OBI1koy9xqXSIq3UtUFCKtk6Btg82rdVM2aFMPT3ZoYVarG+ylPcUOHd684XpgGASxE6dIgXz2pvng==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "GtbvnySinrE6Canm6fVjyUOxs4G1bw0aRLs9oPVMdodOKc9TxIQjp1lzVBtr6Jli+nzIxtC86xP5J6r9tufnrQ==",
        "dependencies": {
          "GraphQL.Client": "6.0.0",
          "Microsoft.Bcl.AsyncInterfaces": "5.0.0",
@@ -367,14 +367,14 @@
          "Microsoft.Extensions.Logging": "2.2.0",
          "Speckle.DoubleNumerics": "4.1.0",
          "Speckle.Newtonsoft.Json": "13.0.2",
-          "Speckle.Sdk.Dependencies": "3.5.4"
+          "Speckle.Sdk.Dependencies": "3.9.0"
        }
      },
      "Speckle.Sdk.Dependencies": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "d0ZOHiK11Hq9r7YEkfTvVu33ygWtsrgysIWdCRAz6rdlcAgMCEkWVBoe3jDjxdmUy20TToaQlFKfMH4hTyzWXg=="
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "m/3i+DX/1McN8ig0CcjmHM1BcNmNxgmny/735sKntzzDw23wdo868eOOTrogzmDoYHTyc7J4IjK+GE7iAyWn/g=="
      }
    }
  }
@@ -219,9 +219,9 @@
        "dependencies": {
          "Microsoft.Extensions.DependencyInjection": "[2.2.0, )",
          "Speckle.Connectors.Logging": "[1.0.0, )",
-          "Speckle.Objects": "[3.5.4, )",
-          "Speckle.Sdk": "[3.5.4, )",
-          "Speckle.Sdk.Dependencies": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )",
+          "Speckle.Sdk": "[3.9.0, )",
+          "Speckle.Sdk.Dependencies": "[3.9.0, )"
        }
      },
      "speckle.connectors.dui": {
@@ -254,7 +254,7 @@
        "type": "Project",
        "dependencies": {
          "Microsoft.Extensions.Logging.Abstractions": "[2.2.0, )",
-          "Speckle.Objects": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )"
        }
      },
      "Microsoft.Extensions.DependencyInjection": {
@@ -298,18 +298,18 @@
      },
      "Speckle.Objects": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o7ex4+yHJYI8pJbsjNqw+D8r8WjkBoB5aK/GQlGJd/0zydrPxN4SMKS4arpRBR3CUD6JhtQMatScXZOrslGXQg==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "fAOUhScCfDFVVynvipczjyw9RZlOgPOo8aH5A7EDAwZiDuDdd4EsnrqBCSPlmuoPYzY7hsN+5mfRkfw2rB36Ig==",
        "dependencies": {
-          "Speckle.Sdk": "3.5.4"
+          "Speckle.Sdk": "3.9.0"
        }
      },
      "Speckle.Sdk": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o4bEJTz+OBI1koy9xqXSIq3UtUFCKtk6Btg82rdVM2aFMPT3ZoYVarG+ylPcUOHd684XpgGASxE6dIgXz2pvng==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "GtbvnySinrE6Canm6fVjyUOxs4G1bw0aRLs9oPVMdodOKc9TxIQjp1lzVBtr6Jli+nzIxtC86xP5J6r9tufnrQ==",
        "dependencies": {
          "GraphQL.Client": "6.0.0",
          "Microsoft.Data.Sqlite": "7.0.5",
@@ -317,14 +317,14 @@
          "Microsoft.Extensions.Logging": "2.2.0",
          "Speckle.DoubleNumerics": "4.1.0",
          "Speckle.Newtonsoft.Json": "13.0.2",
-          "Speckle.Sdk.Dependencies": "3.5.4"
+          "Speckle.Sdk.Dependencies": "3.9.0"
        }
      },
      "Speckle.Sdk.Dependencies": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "d0ZOHiK11Hq9r7YEkfTvVu33ygWtsrgysIWdCRAz6rdlcAgMCEkWVBoe3jDjxdmUy20TToaQlFKfMH4hTyzWXg=="
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "m/3i+DX/1McN8ig0CcjmHM1BcNmNxgmny/735sKntzzDw23wdo868eOOTrogzmDoYHTyc7J4IjK+GE7iAyWn/g=="
      }
    },
    "net8.0-windows7.0/win-x64": {
@@ -219,9 +219,9 @@
        "dependencies": {
          "Microsoft.Extensions.DependencyInjection": "[2.2.0, )",
          "Speckle.Connectors.Logging": "[1.0.0, )",
-          "Speckle.Objects": "[3.5.4, )",
-          "Speckle.Sdk": "[3.5.4, )",
-          "Speckle.Sdk.Dependencies": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )",
+          "Speckle.Sdk": "[3.9.0, )",
+          "Speckle.Sdk.Dependencies": "[3.9.0, )"
        }
      },
      "speckle.connectors.dui": {
@@ -254,7 +254,7 @@
        "type": "Project",
        "dependencies": {
          "Microsoft.Extensions.Logging.Abstractions": "[2.2.0, )",
-          "Speckle.Objects": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )"
        }
      },
      "Microsoft.Extensions.DependencyInjection": {
@@ -298,18 +298,18 @@
      },
      "Speckle.Objects": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o7ex4+yHJYI8pJbsjNqw+D8r8WjkBoB5aK/GQlGJd/0zydrPxN4SMKS4arpRBR3CUD6JhtQMatScXZOrslGXQg==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "fAOUhScCfDFVVynvipczjyw9RZlOgPOo8aH5A7EDAwZiDuDdd4EsnrqBCSPlmuoPYzY7hsN+5mfRkfw2rB36Ig==",
        "dependencies": {
-          "Speckle.Sdk": "3.5.4"
+          "Speckle.Sdk": "3.9.0"
        }
      },
      "Speckle.Sdk": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o4bEJTz+OBI1koy9xqXSIq3UtUFCKtk6Btg82rdVM2aFMPT3ZoYVarG+ylPcUOHd684XpgGASxE6dIgXz2pvng==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "GtbvnySinrE6Canm6fVjyUOxs4G1bw0aRLs9oPVMdodOKc9TxIQjp1lzVBtr6Jli+nzIxtC86xP5J6r9tufnrQ==",
        "dependencies": {
          "GraphQL.Client": "6.0.0",
          "Microsoft.Data.Sqlite": "7.0.5",
@@ -317,14 +317,14 @@
          "Microsoft.Extensions.Logging": "2.2.0",
          "Speckle.DoubleNumerics": "4.1.0",
          "Speckle.Newtonsoft.Json": "13.0.2",
-          "Speckle.Sdk.Dependencies": "3.5.4"
+          "Speckle.Sdk.Dependencies": "3.9.0"
        }
      },
      "Speckle.Sdk.Dependencies": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "d0ZOHiK11Hq9r7YEkfTvVu33ygWtsrgysIWdCRAz6rdlcAgMCEkWVBoe3jDjxdmUy20TToaQlFKfMH4hTyzWXg=="
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "m/3i+DX/1McN8ig0CcjmHM1BcNmNxgmny/735sKntzzDw23wdo868eOOTrogzmDoYHTyc7J4IjK+GE7iAyWn/g=="
      }
    },
    "net8.0-windows7.0/win-x64": {
@@ -3,6 +3,8 @@ using Microsoft.Extensions.DependencyInjection;
 using Speckle.Connectors.Autocad.DependencyInjection;
 using Speckle.Connectors.Autocad.Operations.Send;
 using Speckle.Connectors.Civil3dShared.Bindings;
+using Speckle.Connectors.Civil3dShared.HostApp;
+using Speckle.Connectors.Civil3dShared.Operations.Receive;
 using Speckle.Connectors.Civil3dShared.Operations.Send;
 using Speckle.Connectors.Common.Builders;
 using Speckle.Connectors.DUI.Bindings;
@@ -24,10 +26,12 @@ public static class Civil3dConnectorModule

    // add receive
    serviceCollection.LoadReceive();
+    serviceCollection.AddScoped<IHostObjectBuilder, Civil3dHostObjectBuilder>();
    serviceCollection.AddSingleton<IBinding, Civil3dReceiveBinding>();

    // additional classes
    serviceCollection.AddScoped<PropertySetDefinitionHandler>();
+    serviceCollection.AddScoped<PropertySetBaker>();

    // automatically detects the Class:IClass interface pattern to register all generated interfaces
    serviceCollection.AddMatchingInterfacesAsTransient(Assembly.GetExecutingAssembly());
@@ -0,0 +1,404 @@
+using Microsoft.Extensions.Logging;
+using Speckle.Connectors.Common.Operations;
+using Speckle.Converters.Civil3dShared;
+using Speckle.Converters.Civil3dShared.Helpers;
+using Speckle.Converters.Civil3dShared.ToSpeckle;
+using Speckle.Converters.Common;
+using Speckle.Sdk;
+using Speckle.Sdk.Models;
+using AAEC = Autodesk.Aec;
+using AAECPDB = Autodesk.Aec.PropertyData.DatabaseServices;
+using ADB = Autodesk.AutoCAD.DatabaseServices;
+
+namespace Speckle.Connectors.Civil3dShared.HostApp;
+
+/// <summary>
+/// Helper class to bake property sets to entities on receive.
+/// </summary>
+public class PropertySetBaker
+{
+  private const string PROP_SET_DEF_DICT_NAME = "AecPropertySetDefs";
+  private readonly IConverterSettingsStore<Civil3dConversionSettings> _settingsStore;
+  private readonly ILogger<PropertySetBaker> _logger;
+  private readonly PropertyHandler _propertyHandler;
+
+  /// <summary>
+  /// Map of property set definition name to its ObjectId. Populated during ParsePropertySetDefinitions.
+  /// </summary>
+  private readonly Dictionary<string, ADB.ObjectId> _propertySetDefinitionMap = new();
+
+  public PropertySetBaker(
+    IConverterSettingsStore<Civil3dConversionSettings> settingsStore,
+    ILogger<PropertySetBaker> logger
+  )
+  {
+    _settingsStore = settingsStore;
+    _logger = logger;
+    _propertyHandler = new PropertyHandler();
+  }
+
+  /// <summary>
+  /// Removes all property set definitions with a prefix before receive operation.
+  /// </summary>
+  public void PurgePropertySets(string namePrefix)
+  {
+    ADB.Database db = _settingsStore.Current.Document.Database;
+    using var tr = db.TransactionManager.StartTransaction();
+
+    List<ADB.ObjectId> definitionsToDelete = new();
+
+    // Access the property set definition dictionary from the named object dictionary
+    var nod = (ADB.DBDictionary)tr.GetObject(db.NamedObjectsDictionaryId, ADB.OpenMode.ForRead);
+
+    if (nod.Contains(PROP_SET_DEF_DICT_NAME))
+    {
+      ADB.ObjectId propSetDefsDictId = nod.GetAt(PROP_SET_DEF_DICT_NAME);
+      var propSetDefsDict = (ADB.DBDictionary)tr.GetObject(propSetDefsDictId, ADB.OpenMode.ForRead);
+
+      // Iterate through all property set definitions in the dictionary
+      foreach (ADB.DBDictionaryEntry entry in propSetDefsDict)
+      {
+        if (entry.Key.Contains(namePrefix))
+        {
+          definitionsToDelete.Add(entry.Value);
+        }
+      }
+    }
+
+    // Delete the matching definitions
+    foreach (ADB.ObjectId defId in definitionsToDelete)
+    {
+      try
+      {
+        var propSetDef = (AAECPDB.PropertySetDefinition)tr.GetObject(defId, ADB.OpenMode.ForWrite);
+        propSetDef.Erase();
+      }
+      catch (Exception ex) when (!ex.IsFatal())
+      {
+        _logger.LogWarning(ex, "Failed to purge property set definition");
+      }
+    }
+
+    tr.Commit();
+  }
+
+  /// <summary>
+  /// Parse and bake all property set definitions from the root object.
+  /// Should be called after purging and after materials/colors are parsed.
+  /// </summary>
+  public void ParseAndBakePropertySetDefinitions(Base rootObject, string namePrefix)
+  {
+    _propertySetDefinitionMap.Clear();
+
+    if (rootObject[ProxyKeys.PROPERTYSET_DEFINITIONS] is not Dictionary<string, object?> definitions)
+    {
+      return;
+    }
+
+    if (definitions.Count == 0)
+    {
+      return;
+    }
+
+    using var tr = _settingsStore.Current.Document.Database.TransactionManager.StartTransaction();
+
+    foreach (var definition in definitions)
+    {
+      string setName = definition.Key;
+      object? setDefObj = definition.Value;
+
+      if (setDefObj is not Dictionary<string, object?> setDefData)
+      {
+        _logger.LogWarning("Property set definition {SetName} has invalid data format", setName);
+        continue;
+      }
+
+      if (!setDefData.TryGetValue(PropertySetDefinitionHandler.PROP_SET_PROP_DEFS_KEY, out var propDefsObj))
+      {
+        _logger.LogWarning("Property set definition {SetName} missing propertyDefinitions", setName);
+        continue;
+      }
+
+      if (propDefsObj is not Dictionary<string, object?> propertyDefinitions)
+      {
+        _logger.LogWarning("Property set definition {SetName} propertyDefinitions has invalid format", setName);
+        continue;
+      }
+
+      ADB.ObjectId defId = CreatePropertySetDefinition(setName, propertyDefinitions, namePrefix, tr);
+      if (!defId.IsNull)
+      {
+        _propertySetDefinitionMap[setName] = defId;
+      }
+    }
+
+    tr.Commit();
+  }
+
+  /// <summary>
+  /// Try to bake property sets from a Speckle object to a Civil3D entity.
+  /// </summary>
+  public bool TryBakePropertySets(ADB.Entity entity, Base sourceObject, ADB.Transaction tr)
+  {
+    if (
+      sourceObject["properties"] is not Dictionary<string, object?> properties
+      || !properties.TryGetValue("Property Sets", out var propertySetsObj)
+      || propertySetsObj is not Dictionary<string, object?> propertySets
+      || propertySets.Count == 0
+    )
+    {
+      return false;
+    }
+
+    try
+    {
+      foreach (var propertySet in propertySets)
+      {
+        string setName = propertySet.Key;
+        object? setDataObj = propertySet.Value;
+
+        if (setDataObj is not Dictionary<string, object?> setData)
+        {
+          _logger.LogWarning("Property set {SetName} has invalid data format", setName);
+          continue;
+        }
+
+        if (!TryBakePropertySet(entity, setName, setData, tr))
+        {
+          _logger.LogWarning("Failed to bake property set {SetName} onto entity", setName);
+        }
+      }
+
+      return true;
+    }
+    catch (Exception ex) when (!ex.IsFatal())
+    {
+      _logger.LogError(ex, "Failed to bake property sets onto entity {Handle}", entity.Handle);
+      return false;
+    }
+  }
+
+  private bool TryBakePropertySet(
+    ADB.Entity entity,
+    string setName,
+    Dictionary<string, object?> setData,
+    ADB.Transaction tr
+  )
+  {
+    try
+    {
+      if (!_propertySetDefinitionMap.TryGetValue(setName, out ADB.ObjectId propertySetDefId))
+      {
+        _logger.LogWarning("Property set definition {SetName} not found in definition map", setName);
+        return false;
+      }
+
+      if (propertySetDefId.IsNull)
+      {
+        return false;
+      }
+
+      if (ObjectHasPropertySet(entity, propertySetDefId))
+      {
+        throw new SpeckleException($"Property set '{setName}' already exists on entity.");
+      }
+
+      return AddPropertySetToEntity(entity, propertySetDefId, setData, tr);
+    }
+    catch (Exception ex) when (!ex.IsFatal())
+    {
+      _logger.LogWarning(ex, "Failed to process property set {SetName}", setName);
+      return false;
+    }
+  }
+
+  private ADB.ObjectId CreatePropertySetDefinition(
+    string setName,
+    Dictionary<string, object?> propertyDefinitions,
+    string namePrefix,
+    ADB.Transaction tr
+  )
+  {
+    var db = _settingsStore.Current.Document.Database;
+    using AAECPDB.DictionaryPropertySetDefinitions propSetDefs = new(db);
+
+    string prefixedName = $"{setName}-{namePrefix}";
+
+    AAECPDB.PropertySetDefinition propSetDef = new();
+    propSetDef.SetToStandard(db);
+    propSetDef.SubSetDatabaseDefaults(db);
+    //propSetDef.Description = "Property Set Definition added by Speckle"; // POC: should use the description that was published. can this back in if needed
+    propSetDef.AppliesToAll = true;
+
+    foreach (var propertyDefinition in propertyDefinitions)
+    {
+      string propertyName = propertyDefinition.Key;
+      object? propertyDefObj = propertyDefinition.Value;
+
+      if (propertyDefObj is not Dictionary<string, object?> propertyDefDict)
+      {
+        continue;
+      }
+
+      if (
+        !propertyDefDict.TryGetValue(PropertySetDefinitionHandler.PROP_DEF_TYPE_KEY, out var dataTypeStr)
+        || dataTypeStr is not string dataTypeString
+      )
+      {
+        _logger.LogError(
+          "Property set definition {SetName} is invalid: property {PropertyName} missing or invalid dataType",
+          setName,
+          propertyName
+        );
+        return ADB.ObjectId.Null;
+      }
+
+      if (!Enum.TryParse(dataTypeString, out AAEC.PropertyData.DataType dataType))
+      {
+        _logger.LogError(
+          "Property set definition {SetName} is invalid: unsupported data type {DataType} for property {PropertyName}",
+          setName,
+          dataTypeString,
+          propertyName
+        );
+        return ADB.ObjectId.Null;
+      }
+
+      AAECPDB.PropertyDefinition propDef = new() { DataType = dataType, Name = propertyName };
+
+      propDef.SetToStandard(db);
+      propDef.SubSetDatabaseDefaults(db);
+
+      if (
+        propertyDefDict.TryGetValue(PropertySetDefinitionHandler.PROP_DEF_DEFAULT_VALUE_KEY, out object? defaultValue)
+        && defaultValue != null
+      )
+      {
+        try
+        {
+          // Cast numeric types to avoid bad numeric value errors
+          var convertedValue = dataType switch
+          {
+            AAEC.PropertyData.DataType.Integer => (int)(long)defaultValue,
+            AAEC.PropertyData.DataType.AutoIncrement => (int)(long)defaultValue,
+            _ => defaultValue
+          };
+
+          propDef.DefaultData = convertedValue;
+        }
+        catch (Exception ex) when (!ex.IsFatal())
+        {
+          _logger.LogWarning(
+            ex,
+            "Failed to set default value for property {PropertyName}, continuing without default",
+            propertyName
+          );
+        }
+      }
+
+      propSetDef.Definitions.Add(propDef);
+    }
+
+    propSetDefs.AddNewRecord(prefixedName, propSetDef);
+    tr.AddNewlyCreatedDBObject(propSetDef, true);
+
+    return propSetDef.ObjectId;
+  }
+
+  private bool ObjectHasPropertySet(ADB.DBObject obj, ADB.ObjectId propertySetId)
+  {
+    try
+    {
+      ADB.ObjectId tempId = AAECPDB.PropertyDataServices.GetPropertySet(obj, propertySetId);
+      return !tempId.IsNull;
+    }
+    catch (Autodesk.AutoCAD.Runtime.Exception ex) when (!ex.IsFatal())
+    {
+      return false;
+    }
+  }
+
+  private bool AddPropertySetToEntity(
+    ADB.Entity entity,
+    ADB.ObjectId propertySetDefId,
+    Dictionary<string, object?> setData,
+    ADB.Transaction tr
+  )
+  {
+    try
+    {
+      if (!entity.IsWriteEnabled)
+      {
+        entity.UpgradeOpen();
+      }
+
+      AAECPDB.PropertyDataServices.AddPropertySet(entity, propertySetDefId);
+
+      return TrySetPropertyValues(entity, propertySetDefId, setData, tr);
+    }
+    catch (Exception ex) when (!ex.IsFatal())
+    {
+      _logger.LogWarning(ex, "Failed to add property set to entity");
+      return false;
+    }
+  }
+
+  private bool TrySetPropertyValues(
+    ADB.Entity entity,
+    ADB.ObjectId propertySetDefId,
+    Dictionary<string, object?> setData,
+    ADB.Transaction tr
+  )
+  {
+    try
+    {
+      ADB.ObjectId propertySetId = AAECPDB.PropertyDataServices.GetPropertySet(entity, propertySetDefId);
+      var propertySet = (AAECPDB.PropertySet)tr.GetObject(propertySetId, ADB.OpenMode.ForWrite);
+      var setDefinition = (AAECPDB.PropertySetDefinition)tr.GetObject(propertySetDefId, ADB.OpenMode.ForRead);
+
+      // Build a map of property names to definition IDs
+      Dictionary<string, int> propertyNameToId = new();
+      foreach (AAECPDB.PropertyDefinition propDef in setDefinition.Definitions)
+      {
+        propertyNameToId[propDef.Name] = propDef.Id;
+      }
+
+      foreach (var propertyEntry in setData)
+      {
+        string propertyName = propertyEntry.Key;
+        object? propertyDataObj = propertyEntry.Value;
+
+        if (propertyDataObj is not Dictionary<string, object?> propertyDataDict)
+        {
+          continue;
+        }
+
+        if (!propertyDataDict.TryGetValue("value", out var value) || value == null)
+        {
+          continue;
+        }
+
+        if (!propertyNameToId.TryGetValue(propertyName, out int propertyId))
+        {
+          continue;
+        }
+
+        _propertyHandler.TryGetValue(
+          () =>
+          {
+            propertySet.SetAt(propertyId, value);
+            return true;
+          },
+          out _
+        );
+      }
+
+      return true;
+    }
+    catch (Exception ex) when (!ex.IsFatal())
+    {
+      _logger.LogWarning(ex, "Failed to update property set values");
+      return false;
+    }
+  }
+}
@@ -0,0 +1,60 @@
+using Autodesk.AutoCAD.DatabaseServices;
+using Speckle.Connectors.Autocad.HostApp;
+using Speckle.Connectors.Autocad.Operations.Receive;
+using Speckle.Connectors.Civil3dShared.HostApp;
+using Speckle.Connectors.Common.Operations;
+using Speckle.Connectors.Common.Operations.Receive;
+using Speckle.Converters.Common;
+using Speckle.Sdk.Models;
+
+namespace Speckle.Connectors.Civil3dShared.Operations.Receive;
+
+/// <summary>
+/// <para>Civil3D specific host object builder with property set support. Expects to be a scoped dependency per receive operation.</para>
+/// </summary>
+public sealed class Civil3dHostObjectBuilder : AutocadHostObjectBaseBuilder
+{
+  private readonly PropertySetBaker _propertySetBaker;
+
+  public Civil3dHostObjectBuilder(
+    IRootToHostConverter converter,
+    AutocadLayerBaker layerBaker,
+    AutocadGroupBaker groupBaker,
+    AutocadInstanceBaker instanceBaker,
+    IAutocadMaterialBaker materialBaker,
+    IAutocadColorBaker colorBaker,
+    AutocadContext autocadContext,
+    RootObjectUnpacker rootObjectUnpacker,
+    IReceiveConversionHandler conversionHandler,
+    PropertySetBaker propertySetBaker
+  )
+    : base(
+      converter,
+      layerBaker,
+      groupBaker,
+      instanceBaker,
+      materialBaker,
+      colorBaker,
+      autocadContext,
+      rootObjectUnpacker,
+      conversionHandler
+    )
+  {
+    _propertySetBaker = propertySetBaker;
+  }
+
+  protected override void PreReceiveAdditionalDeepClean(string baseLayerPrefix)
+  {
+    _propertySetBaker.PurgePropertySets(baseLayerPrefix);
+  }
+
+  protected override void ParseAndBakeAdditionalProxies(Base rootObject, string baseLayerPrefix)
+  {
+    _propertySetBaker.ParseAndBakePropertySetDefinitions(rootObject, baseLayerPrefix);
+  }
+
+  protected override void PostBakeEntity(Entity entity, Base originalObject, Transaction tr)
+  {
+    _propertySetBaker.TryBakePropertySets(entity, originalObject, tr);
+  }
+}
@@ -11,11 +11,15 @@
  <ItemGroup>
    <Compile Include="$(MSBuildThisFileDirectory)Bindings\Civil3dReceiveBinding.cs" />
    <Compile Include="$(MSBuildThisFileDirectory)DependencyInjection\Civil3dConnectorModule.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)HostApp\PropertySetBaker.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Operations\Receive\Civil3dHostObjectBuilder.cs" />
    <Compile Include="$(MSBuildThisFileDirectory)Operations\Send\Civil3dRootObjectBuilder.cs" />
    <Compile Include="$(MSBuildThisFileDirectory)Bindings\Civil3dSendBinding.cs" />
  </ItemGroup>
  <ItemGroup>
    <Folder Include="$(MSBuildThisFileDirectory)DependencyInjection\" />
+    <Folder Include="$(MSBuildThisFileDirectory)HostApp\" />
+    <Folder Include="$(MSBuildThisFileDirectory)Operations\Receive\" />
    <Folder Include="$(MSBuildThisFileDirectory)Operations\Send\" />
  </ItemGroup>
 </Project>
@@ -11,7 +11,7 @@ namespace Speckle.Connectors.CSiShared.HostApp.Helpers;
 /// Currently, all material property extraction can happen on a CsiShared level which simplifies things a lot.
 /// Properties depend on the directional symmetry of the material, hence the switch statements.
 /// </remarks>
-public class CsiMaterialPropertyExtractor
+public class CsiMaterialPropertyExtractor : IMaterialPropertyExtractor
 {
  /// <summary>
  /// Property strings for all mechanical properties, used by numerous methods.
@@ -35,11 +35,11 @@ public class CsiMaterialPropertyExtractor
    _settingsStore = settingsStore;
  }

-  public void ExtractProperties(string materialName, Dictionary<string, object?> properties)
+  public void ExtractProperties(string name, Dictionary<string, object?> properties)
  {
-    GetGeneralProperties(materialName, properties);
-    GetWeightAndMassProperties(materialName, properties); // TODO: Add units
-    GetMechanicalProperties(materialName, properties); // TODO: Add units
+    GetGeneralProperties(name, properties);
+    GetWeightAndMassProperties(name, properties);
+    GetMechanicalProperties(name, properties);
  }

  private void GetGeneralProperties(string materialName, Dictionary<string, object?> properties)
@@ -76,7 +76,7 @@ public class CsiMaterialPropertyExtractor
      ref massPerUnitVolume
    );

-    var weightAndMass = properties.EnsureNested("Weight and Mass");
+    var weightAndMass = properties.EnsureNested(SectionPropertyCategory.WEIGHT_AND_MASS);
    weightAndMass["Weight per Unit Volume"] = weightPerUnitVolume;
    weightAndMass["Mass per Unit Volume"] = massPerUnitVolume;
  }
@@ -101,7 +101,7 @@ public class CsiMaterialPropertyExtractor
      _ => throw new ArgumentException($"Unknown symmetry type: {materialDirectionalSymmetryKey}")
    };

-    var mechanicalProperties = properties.EnsureNested("Mechanical Properties");
+    var mechanicalProperties = properties.EnsureNested(SectionPropertyCategory.MECHANICAL_DATA);
    mechanicalProperties["Directional Symmetry Type"] = materialDirectionalSymmetryValue.ToString();

    GetMechanicalPropertiesByType(materialName, materialDirectionalSymmetryValue, mechanicalProperties);
@@ -0,0 +1,13 @@
+namespace Speckle.Connectors.CSiShared.HostApp.Helpers;
+
+/// <summary>
+/// Contract for host application specific material property extraction.
+/// </summary>
+/// <remarks>
+/// Mirrors property extraction system pattern by composing with base extractor.
+/// Enables both shared and application-specific property extraction in one call.
+/// </remarks>
+public interface IApplicationMaterialPropertyExtractor
+{
+  void ExtractProperties(string name, Dictionary<string, object?> properties);
+}
@@ -0,0 +1,9 @@
+namespace Speckle.Connectors.CSiShared.HostApp.Helpers;
+
+/// <summary>
+/// Core contract for material property extraction common across CSi products.
+/// </summary>
+public interface IMaterialPropertyExtractor
+{
+  void ExtractProperties(string name, Dictionary<string, object?> properties);
+}
@@ -0,0 +1,10 @@
+using Speckle.Sdk.Models.Proxies;
+
+namespace Speckle.Connectors.CSiShared.HostApp.Helpers;
+
+// NOTE: Interface because Etabs and Sap2000 material unpacking and extraction is different.
+// At ServiceRegistration, we inject the correct implementation of the IMaterialUnpacker
+public interface IMaterialUnpacker
+{
+  IEnumerable<IProxyCollection> UnpackMaterials();
+}
@@ -1,51 +0,0 @@
-using Speckle.Connectors.CSiShared.HostApp.Helpers;
-using Speckle.Converters.CSiShared.ToSpeckle.Helpers;
-using Speckle.Sdk.Models.Proxies;
-
-namespace Speckle.Connectors.CSiShared.HostApp;
-
-/// <summary>
-/// Creates material proxies based on stored entries from the materials cache
-/// </summary>
-public class MaterialUnpacker
-{
-  private readonly CsiMaterialPropertyExtractor _propertyExtractor;
-  private readonly CsiToSpeckleCacheSingleton _csiToSpeckleCacheSingleton;
-
-  public MaterialUnpacker(
-    CsiMaterialPropertyExtractor propertyExtractor,
-    CsiToSpeckleCacheSingleton csiToSpeckleCacheSingleton
-  )
-  {
-    _propertyExtractor = propertyExtractor;
-    _csiToSpeckleCacheSingleton = csiToSpeckleCacheSingleton;
-  }
-
-  // Creates a list of material proxies from the csi materials cache
-  public IEnumerable<IProxyCollection> UnpackMaterials()
-  {
-    foreach (var kvp in _csiToSpeckleCacheSingleton.MaterialCache)
-    {
-      // get the cached entry
-      string materialName = kvp.Key;
-      List<string> sectionIds = kvp.Value;
-
-      // get the properties of the material
-      Dictionary<string, object?> properties = new(); // create empty dictionary
-      _propertyExtractor.ExtractProperties(materialName, properties); // dictionary mutated with respective properties
-
-      // create the material proxy
-      GroupProxy materialProxy =
-        new()
-        {
-          id = materialName,
-          name = materialName,
-          applicationId = materialName,
-          objects = sectionIds,
-          ["properties"] = properties
-        };
-
-      yield return materialProxy;
-    }
-  }
-}
@@ -34,7 +34,7 @@ public class CsiRootObjectBuilder : IRootObjectBuilder<ICsiWrapper>
  private readonly IRootToSpeckleConverter _rootToSpeckleConverter;
  private readonly IConverterSettingsStore<CsiConversionSettings> _converterSettings;
  private readonly CsiSendCollectionManager _sendCollectionManager;
-  private readonly MaterialUnpacker _materialUnpacker;
+  private readonly IMaterialUnpacker _materialUnpacker;
  private readonly ISectionUnpacker _sectionUnpacker;
  private readonly ILogger<CsiRootObjectBuilder> _logger;
  private readonly ISdkActivityFactory _activityFactory;
@@ -45,7 +45,7 @@ public class CsiRootObjectBuilder : IRootObjectBuilder<ICsiWrapper>
    IRootToSpeckleConverter rootToSpeckleConverter,
    IConverterSettingsStore<CsiConversionSettings> converterSettings,
    CsiSendCollectionManager sendCollectionManager,
-    MaterialUnpacker materialUnpacker,
+    IMaterialUnpacker materialUnpacker,
    ISectionUnpacker sectionUnpacker,
    ILogger<CsiRootObjectBuilder> logger,
    ISdkActivityFactory activityFactory,
@@ -83,8 +83,16 @@ public class CsiRootObjectBuilder : IRootObjectBuilder<ICsiWrapper>
    using var activity = _activityFactory.Start("Build");

    string modelFileName = _csiApplicationService.SapModel.GetModelFilename(false) ?? "Unnamed model";
+    (string forceUnit, string tempUnit) = GetForceAndTemperatureUnits();
+
    Collection rootObjectCollection =
-      new() { name = modelFileName, ["units"] = _converterSettings.Current.SpeckleUnits };
+      new()
+      {
+        name = modelFileName,
+        ["units"] = _converterSettings.Current.SpeckleUnits,
+        ["forceUnits"] = forceUnit,
+        ["temperatureUnits"] = tempUnit
+      };

    List<SendConversionResult> results = new(csiObjects.Count);
    int count = 0;
@@ -145,7 +153,7 @@ public class CsiRootObjectBuilder : IRootObjectBuilder<ICsiWrapper>
          requestedResultTypes,
          objectSelectionSummary
        );
-        rootObjectCollection["analysisResults"] = analysisResults;
+        rootObjectCollection[RootKeys.ANALYSIS_RESULTS] = analysisResults;
      }
      catch (Exception ex)
      {
@@ -217,4 +225,20 @@ public class CsiRootObjectBuilder : IRootObjectBuilder<ICsiWrapper>
        group => group.Key, // ModelObjectType (FRAME, JOINT, etc.)
        group => group.Select(obj => obj.Name).ToList() // Extract Name from each ICsiWrapper and convert to List<string>
      );
+
+  /// <summary>
+  /// Instantiates a Base object and pre-populates it with the models defined force units.
+  /// </summary>
+  /// <returns></returns>
+  /// <exception cref="SpeckleException"></exception>
+  private (string, string) GetForceAndTemperatureUnits()
+  {
+    var forceUnit = eForce.NotApplicable;
+    var lengthUnit = eLength.NotApplicable;
+    var temperatureUnit = eTemperature.NotApplicable;
+
+    _converterSettings.Current.SapModel.GetDatabaseUnits_2(ref forceUnit, ref lengthUnit, ref temperatureUnit);
+
+    return (forceUnit.ToString(), temperatureUnit.ToString());
+  }
 }
@@ -47,7 +47,7 @@ public static class ServiceRegistration

    services.AddScoped<CsiMaterialPropertyExtractor>();
    services.AddScoped<CsiResultsExtractorFactory>();
-    services.AddScoped<MaterialUnpacker>();
+    services.AddScoped<IMaterialPropertyExtractor, CsiMaterialPropertyExtractor>();
    services.AddScoped<IFrameSectionPropertyExtractor, CsiFrameSectionPropertyExtractor>();
    services.AddScoped<IShellSectionPropertyExtractor, CsiShellSectionPropertyExtractor>();
    services.AddScoped<AnalysisResultsExtractor>();
@@ -19,7 +19,9 @@
    <Compile Include="$(MSBuildThisFileDirectory)Bindings\CsiSharedSendBinding.cs" />
    <Compile Include="$(MSBuildThisFileDirectory)Filters\CsiSharedSelectionFilter.cs" />
    <Compile Include="$(MSBuildThisFileDirectory)HostApp\Helpers\CsiResultsExtractorFactory.cs" />
-    <Compile Include="$(MSBuildThisFileDirectory)HostApp\MaterialUnpacker.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)HostApp\Helpers\IApplicationMaterialPropertyExtractor.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)HostApp\Helpers\IMaterialPropertyExtractor.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)HostApp\Helpers\IMaterialUnpacker.cs" />
    <Compile Include="$(MSBuildThisFileDirectory)HostApp\CsiSendCollectionManager.cs" />
    <Compile Include="$(MSBuildThisFileDirectory)HostApp\Helpers\CsiFrameSectionPropertyExtractor.cs" />
    <Compile Include="$(MSBuildThisFileDirectory)HostApp\Helpers\CsiMaterialPropertyExtractor.cs" />
@@ -31,8 +31,8 @@ public class AnalysisResultsExtractor
    Dictionary<ModelObjectType, List<string>> objectSelectionSummary
  )
  {
-    // Step 1: get analysis units
-    var analysisResults = CreateAnalysisResultsWithUnits();
+    // Step 1: create base object that will hold analysis results
+    var analysisResults = new Base();

    // Step 2: configure and validate load cases
    ConfigureAndValidateSelectedLoadCases(selectedCasesAndCombinations);
@@ -43,36 +43,6 @@ public class AnalysisResultsExtractor
    return analysisResults;
  }

-  /// <summary>
-  /// Instantiates a Base object and pre-populates it with the models defined force units.
-  /// </summary>
-  /// <returns></returns>
-  /// <exception cref="SpeckleException"></exception>
-  private Base CreateAnalysisResultsWithUnits()
-  {
-    var forceUnit = eForce.NotApplicable;
-    var lengthUnit = eLength.NotApplicable;
-    var temperatureUnit = eTemperature.NotApplicable;
-
-    int success = _converterSettingsStore.Current.SapModel.GetDatabaseUnits_2(
-      ref forceUnit,
-      ref lengthUnit,
-      ref temperatureUnit
-    );
-
-    if (success != 0)
-    {
-      throw new SpeckleException("Failed to retrieve units for analysis results");
-    }
-
-    return new Base
-    {
-      ["forceUnit"] = forceUnit.ToString(),
-      ["lengthUnit"] = lengthUnit.ToString(),
-      ["temperatureUnit"] = temperatureUnit.ToString()
-    };
-  }
-
  private void ExtractResults(
    List<string> requestedResultTypes,
    Dictionary<ModelObjectType, List<string>> objectSelectionSummary,
@@ -259,9 +259,9 @@
        "dependencies": {
          "Microsoft.Extensions.DependencyInjection": "[2.2.0, )",
          "Speckle.Connectors.Logging": "[1.0.0, )",
-          "Speckle.Objects": "[3.5.4, )",
-          "Speckle.Sdk": "[3.5.4, )",
-          "Speckle.Sdk.Dependencies": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )",
+          "Speckle.Sdk": "[3.9.0, )",
+          "Speckle.Sdk.Dependencies": "[3.9.0, )"
        }
      },
      "speckle.connectors.dui": {
@@ -285,7 +285,7 @@
        "type": "Project",
        "dependencies": {
          "Microsoft.Extensions.Logging.Abstractions": "[2.2.0, )",
-          "Speckle.Objects": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )"
        }
      },
      "speckle.converters.etabs21": {
@@ -335,18 +335,18 @@
      },
      "Speckle.Objects": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o7ex4+yHJYI8pJbsjNqw+D8r8WjkBoB5aK/GQlGJd/0zydrPxN4SMKS4arpRBR3CUD6JhtQMatScXZOrslGXQg==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "fAOUhScCfDFVVynvipczjyw9RZlOgPOo8aH5A7EDAwZiDuDdd4EsnrqBCSPlmuoPYzY7hsN+5mfRkfw2rB36Ig==",
        "dependencies": {
-          "Speckle.Sdk": "3.5.4"
+          "Speckle.Sdk": "3.9.0"
        }
      },
      "Speckle.Sdk": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o4bEJTz+OBI1koy9xqXSIq3UtUFCKtk6Btg82rdVM2aFMPT3ZoYVarG+ylPcUOHd684XpgGASxE6dIgXz2pvng==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "GtbvnySinrE6Canm6fVjyUOxs4G1bw0aRLs9oPVMdodOKc9TxIQjp1lzVBtr6Jli+nzIxtC86xP5J6r9tufnrQ==",
        "dependencies": {
          "GraphQL.Client": "6.0.0",
          "Microsoft.Bcl.AsyncInterfaces": "5.0.0",
@@ -356,14 +356,14 @@
          "Microsoft.Extensions.Logging": "2.2.0",
          "Speckle.DoubleNumerics": "4.1.0",
          "Speckle.Newtonsoft.Json": "13.0.2",
-          "Speckle.Sdk.Dependencies": "3.5.4"
+          "Speckle.Sdk.Dependencies": "3.9.0"
        }
      },
      "Speckle.Sdk.Dependencies": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "d0ZOHiK11Hq9r7YEkfTvVu33ygWtsrgysIWdCRAz6rdlcAgMCEkWVBoe3jDjxdmUy20TToaQlFKfMH4hTyzWXg=="
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "m/3i+DX/1McN8ig0CcjmHM1BcNmNxgmny/735sKntzzDw23wdo868eOOTrogzmDoYHTyc7J4IjK+GE7iAyWn/g=="
      }
    }
  }
@@ -210,9 +210,9 @@
        "dependencies": {
          "Microsoft.Extensions.DependencyInjection": "[2.2.0, )",
          "Speckle.Connectors.Logging": "[1.0.0, )",
-          "Speckle.Objects": "[3.5.4, )",
-          "Speckle.Sdk": "[3.5.4, )",
-          "Speckle.Sdk.Dependencies": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )",
+          "Speckle.Sdk": "[3.9.0, )",
+          "Speckle.Sdk.Dependencies": "[3.9.0, )"
        }
      },
      "speckle.connectors.dui": {
@@ -236,7 +236,7 @@
        "type": "Project",
        "dependencies": {
          "Microsoft.Extensions.Logging.Abstractions": "[2.2.0, )",
-          "Speckle.Objects": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )"
        }
      },
      "speckle.converters.etabs22": {
@@ -286,18 +286,18 @@
      },
      "Speckle.Objects": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o7ex4+yHJYI8pJbsjNqw+D8r8WjkBoB5aK/GQlGJd/0zydrPxN4SMKS4arpRBR3CUD6JhtQMatScXZOrslGXQg==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "fAOUhScCfDFVVynvipczjyw9RZlOgPOo8aH5A7EDAwZiDuDdd4EsnrqBCSPlmuoPYzY7hsN+5mfRkfw2rB36Ig==",
        "dependencies": {
-          "Speckle.Sdk": "3.5.4"
+          "Speckle.Sdk": "3.9.0"
        }
      },
      "Speckle.Sdk": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o4bEJTz+OBI1koy9xqXSIq3UtUFCKtk6Btg82rdVM2aFMPT3ZoYVarG+ylPcUOHd684XpgGASxE6dIgXz2pvng==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "GtbvnySinrE6Canm6fVjyUOxs4G1bw0aRLs9oPVMdodOKc9TxIQjp1lzVBtr6Jli+nzIxtC86xP5J6r9tufnrQ==",
        "dependencies": {
          "GraphQL.Client": "6.0.0",
          "Microsoft.Data.Sqlite": "7.0.5",
@@ -305,14 +305,14 @@
          "Microsoft.Extensions.Logging": "2.2.0",
          "Speckle.DoubleNumerics": "4.1.0",
          "Speckle.Newtonsoft.Json": "13.0.2",
-          "Speckle.Sdk.Dependencies": "3.5.4"
+          "Speckle.Sdk.Dependencies": "3.9.0"
        }
      },
      "Speckle.Sdk.Dependencies": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "d0ZOHiK11Hq9r7YEkfTvVu33ygWtsrgysIWdCRAz6rdlcAgMCEkWVBoe3jDjxdmUy20TToaQlFKfMH4hTyzWXg=="
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "m/3i+DX/1McN8ig0CcjmHM1BcNmNxgmny/735sKntzzDw23wdo868eOOTrogzmDoYHTyc7J4IjK+GE7iAyWn/g=="
      }
    }
  }
@@ -0,0 +1,50 @@
+using Speckle.Connectors.CSiShared.HostApp.Helpers;
+using Speckle.Converters.CSiShared.ToSpeckle.Helpers;
+using Speckle.Sdk.Models.Proxies;
+
+namespace Speckle.Connectors.ETABSShared.HostApp;
+
+public class EtabsMaterialUnpacker : IMaterialUnpacker
+{
+  private readonly CsiToSpeckleCacheSingleton _csiToSpeckleCacheSingleton;
+  private readonly IMaterialPropertyExtractor _csiMaterialPropertyExtractor;
+  private readonly IApplicationMaterialPropertyExtractor _etabsMaterialPropertyExtractor;
+
+  public EtabsMaterialUnpacker(
+    CsiToSpeckleCacheSingleton csiToSpeckleCacheSingleton,
+    IMaterialPropertyExtractor csiMaterialPropertyExtractor,
+    IApplicationMaterialPropertyExtractor etabsMaterialPropertyExtractor
+  )
+  {
+    _csiToSpeckleCacheSingleton = csiToSpeckleCacheSingleton;
+    _csiMaterialPropertyExtractor = csiMaterialPropertyExtractor;
+    _etabsMaterialPropertyExtractor = etabsMaterialPropertyExtractor;
+  }
+
+  public IEnumerable<IProxyCollection> UnpackMaterials()
+  {
+    foreach (var kvp in _csiToSpeckleCacheSingleton.MaterialCache)
+    {
+      string name = kvp.Key;
+      var sectionIds = kvp.Value;
+
+      // get the properties of the material
+      Dictionary<string, object?> properties = [];
+      _csiMaterialPropertyExtractor.ExtractProperties(name, properties);
+      _etabsMaterialPropertyExtractor.ExtractProperties(name, properties);
+
+      // create the material proxy
+      GroupProxy materialProxy =
+        new()
+        {
+          id = name,
+          name = name,
+          applicationId = name,
+          objects = sectionIds,
+          ["properties"] = properties
+        };
+
+      yield return materialProxy;
+    }
+  }
+}
@@ -0,0 +1,219 @@
+using Speckle.Connectors.CSiShared.HostApp.Helpers;
+using Speckle.Converters.Common;
+using Speckle.Converters.CSiShared;
+using Speckle.Converters.CSiShared.Utils;
+
+namespace Speckle.Connectors.ETABS22.HostApp.Helpers;
+
+public class EtabsMaterialPropertyExtractor : IApplicationMaterialPropertyExtractor
+{
+  private readonly IConverterSettingsStore<CsiConversionSettings> _settingsStore;
+
+  private readonly Dictionary<int, string?> _ssTypeDict =
+    new()
+    {
+      { 0, "User defined" },
+      { 1, "Parametric - Simple" },
+      { 2, "Parametric - Mander" }
+    };
+
+  private readonly Dictionary<int, string?> _ssHysTypeDict =
+    new()
+    {
+      { 0, "Elastic" },
+      { 1, "Kinematic" },
+      { 2, "Takeda" },
+      { 3, "Pivot" },
+      { 4, "Concrete" },
+      { 5, "BRB Hardening" },
+      { 6, "Degrading" },
+      { 7, "Isotropic" }
+    };
+
+  private const int TEMP = 0;
+
+  public EtabsMaterialPropertyExtractor(IConverterSettingsStore<CsiConversionSettings> settingsStore)
+  {
+    _settingsStore = settingsStore;
+  }
+
+  public void ExtractProperties(string name, Dictionary<string, object?> properties)
+  {
+    // we want to get some of the "other" material property data that is type specific
+    // csi extractor populates "type" string, but api query arguably simpler and more reliable than dict string access
+    int symType = 0;
+    eMatType matType = 0;
+    _settingsStore.Current.SapModel.PropMaterial.GetTypeOAPI(name, ref matType, ref symType);
+
+    // we don't have design data api queries for these, so early return to avoid creating that specific dictionary
+    if (matType is eMatType.NoDesign or eMatType.Aluminum or eMatType.ColdFormed or eMatType.Masonry)
+    {
+      return;
+    }
+
+    // ensure design data specific properties dictionary that will be mutated in switch expression
+    var designData = properties.EnsureNested(SectionPropertyCategory.DESIGN_DATA);
+
+    // can't do a switch expression here because not all enums have an api query (e.g. masonry, aluminium)
+    switch (matType)
+    {
+      case eMatType.Steel:
+        ExtractSteelProperties(name, designData);
+        break;
+      case eMatType.Concrete:
+        ExtractConcreteProperties(name, designData);
+        break;
+      case eMatType.Rebar:
+        ExtractRebarProperties(name, designData);
+        break;
+      case eMatType.Tendon:
+        ExtractTendonProperties(name, designData);
+        break;
+    }
+  }
+
+  private void ExtractSteelProperties(string name, Dictionary<string, object?> designData)
+  {
+    // step 1: stubs for api query
+    int ssType = 0,
+      ssHysType = 0;
+    double fy = 0,
+      fu = 0,
+      eFy = 0,
+      eFu = 0,
+      strainAtHardening = 0,
+      strainAtMaxStress = 0,
+      strainAtRupture = 0;
+
+    // step 2: api query
+    // NOTE: using the "older" method. Not sure if _1 is unsupported in etabs 21
+    // also, _1 doesn't give a lot more MEANINGFUL data
+    _settingsStore.Current.SapModel.PropMaterial.GetOSteel(
+      name,
+      ref fy,
+      ref fu,
+      ref eFy,
+      ref eFu,
+      ref ssType,
+      ref ssHysType,
+      ref strainAtHardening,
+      ref strainAtMaxStress,
+      ref strainAtRupture
+    );
+
+    // step 3: mutate properties dictionary
+    designData["Fy"] = fy;
+    designData["Fu"] = fu;
+    designData["EFy"] = eFy;
+    designData["EFu"] = eFu;
+    designData["SSType"] = _ssTypeDict.TryGetValue(ssType, out string? ssTypeValue) ? ssTypeValue : "";
+    designData["SSHysType"] = _ssHysTypeDict.TryGetValue(ssHysType, out string? ssHysTypeValue) ? ssHysTypeValue : "";
+    designData["StrainAtHardening"] = strainAtHardening;
+    designData["StrainAtMaxStress"] = strainAtMaxStress;
+    designData["StrainAtRupture"] = strainAtRupture;
+    designData["Temp"] = TEMP;
+  }
+
+  private void ExtractConcreteProperties(string name, Dictionary<string, object?> designData)
+  {
+    // step 1: stubs for api query
+    int ssType = 0,
+      ssHysType = 0;
+    bool isLightweight = false;
+    double fc = 0,
+      fcsFactor = 0,
+      strainAtFc = 0,
+      strainUltimate = 0,
+      frictionAngle = 0,
+      dilatationalAngle = 0;
+
+    // step 2: api query
+    // NOTE: using the "older" method. Not sure if _1 or _2 are unsupported in etabs 21
+    // also, _1 or _2 doesn't give a lot more MEANINGFUL data
+    _settingsStore.Current.SapModel.PropMaterial.GetOConcrete(
+      name,
+      ref fc,
+      ref isLightweight,
+      ref fcsFactor,
+      ref ssType,
+      ref ssHysType,
+      ref strainAtFc,
+      ref strainUltimate,
+      ref frictionAngle,
+      ref dilatationalAngle
+    );
+
+    // step 3: mutate properties dictionary
+    designData["Fc"] = fc;
+    designData["FcsFactor"] = fcsFactor;
+    designData["StrainAtFc"] = strainAtFc;
+    designData["StrainUltimate"] = strainUltimate;
+    designData["FrictionAngle"] = frictionAngle;
+    designData["DilatationalAngle"] = dilatationalAngle;
+    designData["IsLightweight"] = isLightweight.ToString();
+    designData["SSType"] = _ssTypeDict.TryGetValue(ssType, out string? ssTypeValue) ? ssTypeValue : "";
+    designData["SSHysType"] = _ssHysTypeDict.TryGetValue(ssHysType, out string? ssHysTypeValue) ? ssHysTypeValue : "";
+    designData["Temp"] = TEMP;
+  }
+
+  private void ExtractRebarProperties(string name, Dictionary<string, object?> designData)
+  {
+    // step 1: stubs for api query
+    bool useCaltransSsDefaults = false;
+    int ssType = 0,
+      ssHysType = 0;
+    double fy = 0,
+      fu = 0,
+      eFy = 0,
+      eFu = 0,
+      strainAtHardening = 0,
+      strainUltimate = 0;
+
+    // step 2: api query
+    // NOTE: using the "older" method. Not sure if _1 is unsupported in etabs 21
+    // also, _1 doesn't give a lot more MEANINGFUL data
+    _settingsStore.Current.SapModel.PropMaterial.GetORebar(
+      name,
+      ref fy,
+      ref fu,
+      ref eFy,
+      ref eFu,
+      ref ssType,
+      ref ssHysType,
+      ref strainAtHardening,
+      ref strainUltimate,
+      ref useCaltransSsDefaults
+    );
+
+    // step 3: mutate properties dictionary
+    designData["Fy"] = fy;
+    designData["Fu"] = fu;
+    designData["EFy"] = eFy;
+    designData["EFu"] = eFu;
+    designData["StrainAtHardening"] = strainAtHardening;
+    designData["StrainUltimate"] = strainUltimate;
+    designData["SSType"] = _ssTypeDict.TryGetValue(ssType, out string? ssTypeValue) ? ssTypeValue : "";
+    designData["SSHysType"] = _ssHysTypeDict.TryGetValue(ssHysType, out string? ssHysTypeValue) ? ssHysTypeValue : "";
+    designData["UseCaltransSsDefaults"] = useCaltransSsDefaults.ToString();
+    designData["Temp"] = TEMP;
+  }
+
+  private void ExtractTendonProperties(string name, Dictionary<string, object?> designData)
+  {
+    // step 1: stubs for api query
+    int ssType = 0,
+      ssHysType = 0;
+    double fy = 0,
+      fu = 0;
+
+    // step 2: api query
+    _settingsStore.Current.SapModel.PropMaterial.GetOTendon(name, ref fy, ref fu, ref ssType, ref ssHysType);
+
+    // step 3: mutate properties dictionary
+    designData["Fy"] = fy;
+    designData["Fu"] = fu;
+    designData["SSType"] = _ssTypeDict.TryGetValue(ssType, out string? ssTypeValue) ? ssTypeValue : "";
+    designData["SSHysType"] = _ssHysTypeDict.TryGetValue(ssHysType, out string? ssHysTypeValue) ? ssHysTypeValue : "";
+    designData["Temp"] = TEMP;
+  }
+}
@@ -1,8 +1,7 @@
 using Microsoft.Extensions.Logging;
 using Speckle.Connectors.CSiShared.HostApp.Helpers;
-using Speckle.Converters.Common;
-using Speckle.Converters.CSiShared;
-using Speckle.Converters.CSiShared.Utils;
+using Speckle.Converters.CSiShared.ToSpeckle.Helpers;
+using Speckle.Converters.ETABSShared.ToSpeckle.Helpers;

 namespace Speckle.Connectors.ETABSShared.HostApp.Helpers;

@@ -11,54 +10,55 @@ namespace Speckle.Connectors.ETABSShared.HostApp.Helpers;
 /// </summary>
 public class EtabsShellSectionPropertyExtractor : IApplicationShellSectionPropertyExtractor
 {
-  private readonly IConverterSettingsStore<CsiConversionSettings> _settingsStore;
  private readonly ILogger<EtabsShellSectionPropertyExtractor> _logger;
+  private readonly CsiToSpeckleCacheSingleton _csiToSpeckleCacheSingleton;
  private readonly EtabsShellSectionResolver _etabsShellSectionResolver;

  public EtabsShellSectionPropertyExtractor(
-    IConverterSettingsStore<CsiConversionSettings> settingsStore,
    ILogger<EtabsShellSectionPropertyExtractor> logger,
-    EtabsShellSectionResolver etabsShellSectionResolver
+    EtabsShellSectionResolver etabsShellSectionResolver,
+    CsiToSpeckleCacheSingleton csiToSpeckleCacheSingleton
  )
  {
-    _settingsStore = settingsStore;
    _logger = logger;
    _etabsShellSectionResolver = etabsShellSectionResolver;
+    _csiToSpeckleCacheSingleton = csiToSpeckleCacheSingleton;
  }

  /// <summary>
-  /// Extract shell section properties
+  /// Extract shell section properties from cache.
  /// </summary>
  /// <remarks>
-  /// sectionName is unique across all types (Wall, Slab and Deck)
-  /// There is no general query such as PropArea.GetShell() - rather we have to be specific on the type, for example
-  /// PropArea.GetWall() or PropArea.GetDeck() BUT we can't get the building type given a SectionName.
-  /// Hence the introduction of ResolveSection.
+  /// By the time this method is called during section unpacking, all sections should already be
+  /// resolved and cached by <see cref="EtabsShellPropertiesExtractor"/> during object conversion.
  /// </remarks>
  public void ExtractProperties(string sectionName, Dictionary<string, object?> properties)
  {
-    // Step 01: Finding the appropriate api query for the unknown section type (wall, deck or slab)
-    Dictionary<string, object?> resolvedProperties = _etabsShellSectionResolver.ResolveSection(sectionName);
+    var sectionProps = GetSectionProperties(sectionName);

-    // Step 02: Mutate properties dictionary with resolved properties
-    foreach (var nestedDictionary in resolvedProperties)
+    // shallow copy nested dictionaries into provided properties dict to mutate it (required by interface contract)
+    foreach (var kvp in sectionProps)
    {
-      if (nestedDictionary.Value is not Dictionary<string, object?> nestedValues)
-      {
-        _logger.LogWarning(
-          "Unexpected value type for key {Key} in section {SectionName}. Expected Dictionary<string, object?>, got {ActualType}",
-          nestedDictionary.Key,
-          sectionName,
-          nestedDictionary.Value?.GetType().Name ?? "null"
-        );
-        continue;
-      }
-
-      var nestedProperties = properties.EnsureNested(nestedDictionary.Key);
-      foreach (var kvp in nestedValues)
-      {
-        nestedProperties[kvp.Key] = kvp.Value;
-      }
+      properties[kvp.Key] = kvp.Value;
    }
  }
+
+  private Dictionary<string, object?> GetSectionProperties(string sectionName)
+  {
+    // return cached properties directly
+    if (_csiToSpeckleCacheSingleton.ShellSectionPropertiesCache.TryGetValue(sectionName, out var cachedProperties))
+    {
+      return cachedProperties;
+    }
+
+    // fallback - shouldn't happen because cached populated on the fly as sections appear in the extractor
+    _logger.LogWarning(
+      "Section {SectionName} not in cache during unpacking - resolving via API (expensive)",
+      sectionName
+    );
+
+    var resolved = _etabsShellSectionResolver.ResolveSection(sectionName);
+    _csiToSpeckleCacheSingleton.ShellSectionPropertiesCache[sectionName] = resolved;
+    return resolved;
+  }
 }
@@ -1,6 +1,7 @@
 using Microsoft.Extensions.DependencyInjection;
 using Speckle.Connectors.CSiShared.HostApp;
 using Speckle.Connectors.CSiShared.HostApp.Helpers;
+using Speckle.Connectors.ETABS22.HostApp.Helpers;
 using Speckle.Connectors.ETABSShared.HostApp;
 using Speckle.Connectors.ETABSShared.HostApp.Helpers;
 using Speckle.Connectors.ETABSShared.HostApp.Services;
@@ -14,12 +15,17 @@ public static class ServiceRegistration
  {
    services.AddEtabsConverters();
    services.AddScoped<CsiSendCollectionManager, EtabsSendCollectionManager>();
-    services.AddScoped<EtabsSectionPropertyDefinitionService>();
-    services.AddScoped<EtabsSectionPropertyExtractor>();
-    services.AddScoped<EtabsShellSectionResolver>();
+
+    // material services
+    services.AddScoped<IMaterialUnpacker, EtabsMaterialUnpacker>();
+    services.AddScoped<IApplicationMaterialPropertyExtractor, EtabsMaterialPropertyExtractor>();
+
+    // section services
+    services.AddScoped<ISectionUnpacker, EtabsSectionUnpacker>();
    services.AddScoped<IApplicationFrameSectionPropertyExtractor, EtabsFrameSectionPropertyExtractor>();
    services.AddScoped<IApplicationShellSectionPropertyExtractor, EtabsShellSectionPropertyExtractor>();
-    services.AddScoped<ISectionUnpacker, EtabsSectionUnpacker>();
+    services.AddScoped<EtabsSectionPropertyDefinitionService>();
+    services.AddScoped<EtabsSectionPropertyExtractor>();

    return services;
  }
@@ -9,13 +9,14 @@
    <Import_RootNamespace>Speckle.Connectors.ETABSShared</Import_RootNamespace>
  </PropertyGroup>
  <ItemGroup>
+    <Compile Include="$(MSBuildThisFileDirectory)HostApp\EtabsMaterialUnpacker.cs" />
    <Compile Include="$(MSBuildThisFileDirectory)HostApp\EtabsSectionUnpacker.cs" />
    <Compile Include="$(MSBuildThisFileDirectory)HostApp\EtabsSendCollectionManager.cs" />
    <Compile Include="$(MSBuildThisFileDirectory)HostApp\Helpers\EtabsFrameSectionPropertyExtractor.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)HostApp\Helpers\EtabsMaterialPropertyExtractor.cs" />
    <Compile Include="$(MSBuildThisFileDirectory)HostApp\Helpers\EtabsSectionPropertyDefinitionService.cs" />
    <Compile Include="$(MSBuildThisFileDirectory)HostApp\Helpers\EtabsSectionPropertyExtractor.cs" />
    <Compile Include="$(MSBuildThisFileDirectory)HostApp\Helpers\EtabsShellSectionPropertyExtractor.cs" />
-    <Compile Include="$(MSBuildThisFileDirectory)HostApp\Helpers\EtabsShellSectionResolver.cs" />
    <Compile Include="$(MSBuildThisFileDirectory)Plugin\EtabsPluginBase.cs" />
    <Compile Include="$(MSBuildThisFileDirectory)Plugin\EtabsSpeckleFormBase.cs" />
    <Compile Include="$(MSBuildThisFileDirectory)ServiceRegistration.cs" />
@@ -259,9 +259,9 @@
        "dependencies": {
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@@ -285,7 +285,7 @@
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@@ -337,18 +337,18 @@
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@@ -285,7 +285,7 @@
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@@ -337,18 +337,18 @@
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@@ -285,7 +285,7 @@
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@@ -337,18 +337,18 @@
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@@ -285,7 +285,7 @@
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@@ -337,18 +337,18 @@
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@@ -285,7 +285,7 @@
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@@ -337,18 +337,18 @@
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@@ -265,9 +265,9 @@
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@@ -291,7 +291,7 @@
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@@ -337,18 +337,18 @@
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@@ -292,7 +292,7 @@
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@@ -339,18 +339,18 @@
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-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o7ex4+yHJYI8pJbsjNqw+D8r8WjkBoB5aK/GQlGJd/0zydrPxN4SMKS4arpRBR3CUD6JhtQMatScXZOrslGXQg==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "fAOUhScCfDFVVynvipczjyw9RZlOgPOo8aH5A7EDAwZiDuDdd4EsnrqBCSPlmuoPYzY7hsN+5mfRkfw2rB36Ig==",
        "dependencies": {
-          "Speckle.Sdk": "3.5.4"
+          "Speckle.Sdk": "3.9.0"
        }
      },
      "Speckle.Sdk": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o4bEJTz+OBI1koy9xqXSIq3UtUFCKtk6Btg82rdVM2aFMPT3ZoYVarG+ylPcUOHd684XpgGASxE6dIgXz2pvng==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "GtbvnySinrE6Canm6fVjyUOxs4G1bw0aRLs9oPVMdodOKc9TxIQjp1lzVBtr6Jli+nzIxtC86xP5J6r9tufnrQ==",
        "dependencies": {
          "GraphQL.Client": "6.0.0",
          "Microsoft.Bcl.AsyncInterfaces": "5.0.0",
@@ -360,14 +360,14 @@
          "Microsoft.Extensions.Logging": "2.2.0",
          "Speckle.DoubleNumerics": "4.1.0",
          "Speckle.Newtonsoft.Json": "13.0.2",
-          "Speckle.Sdk.Dependencies": "3.5.4"
+          "Speckle.Sdk.Dependencies": "3.9.0"
        }
      },
      "Speckle.Sdk.Dependencies": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "d0ZOHiK11Hq9r7YEkfTvVu33ygWtsrgysIWdCRAz6rdlcAgMCEkWVBoe3jDjxdmUy20TToaQlFKfMH4hTyzWXg=="
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "m/3i+DX/1McN8ig0CcjmHM1BcNmNxgmny/735sKntzzDw23wdo868eOOTrogzmDoYHTyc7J4IjK+GE7iAyWn/g=="
      }
    },
    ".NETFramework,Version=v4.8/win-x64": {
@@ -16,6 +16,7 @@ using Speckle.Connectors.DUI.Models;
 using Speckle.Connectors.DUI.Models.Card.SendFilter;
 using Speckle.Connectors.DUI.WebView;
 using Speckle.Converter.Navisworks.Settings;
+using Speckle.Converter.Navisworks.Services;
 using Speckle.Converters.Common;
 using Speckle.Sdk.Models.GraphTraversal;

@@ -52,6 +53,9 @@ public static class NavisworksConnectorServiceRegistration
    serviceCollection.AddScoped<NavisworksMaterialUnpacker>();
    serviceCollection.AddScoped<NavisworksColorUnpacker>();

+    // Register dual shared geometry stores for instancing pattern
+    serviceCollection.AddScoped<InstanceStoreManager>();
+
    serviceCollection.AddSingleton<IAppIdleManager, NavisworksIdleManager>();

    // Sending operations
@@ -1,7 +1,10 @@
+using Autodesk.Navisworks.Api.ComApi;
+using Autodesk.Navisworks.Api.Interop.ComApi;
 using Microsoft.Extensions.Logging;
 using Speckle.Connector.Navisworks.Services;
 using Speckle.Converter.Navisworks.Helpers;
 using Speckle.Converter.Navisworks.Settings;
+using Speckle.Converter.Navisworks.ToSpeckle;
 using Speckle.Converters.Common;
 using Speckle.Objects.Other;
 using Speckle.Sdk;
@@ -11,7 +14,8 @@ namespace Speckle.Connector.Navisworks.HostApp;
 public class NavisworksMaterialUnpacker(
  ILogger<NavisworksMaterialUnpacker> logger,
  IConverterSettingsStore<NavisworksConversionSettings> converterSettings,
-  IElementSelectionService selectionService
+  IElementSelectionService selectionService,
+  GeometryToSpeckleConverter converter
 )
 {
  // Helper function to select a property based on the representation mode
@@ -64,6 +68,19 @@ public class NavisworksMaterialUnpacker(

        var navisworksObjectId = selectionService.GetModelItemPath(navisworksObject);
        var finalId = mergedIds.TryGetValue(navisworksObjectId, out var mergedId) ? mergedId : navisworksObjectId;
+
+        var item = selectionService.GetModelItemFromPath(finalId);
+        string hashId = "";
+        var comSelection = ComApiBridge.ToInwOpSelection([item]);
+        var paths = comSelection.Paths();
+        var path = paths.OfType<InwOaPath>().First();
+        var fragments = path.Fragments();
+        if (fragments.Count > 1)
+        {
+          var fragmentId = converter.GenerateFragmentId(paths);
+          hashId = $"geom_{fragmentId}";
+        }
+
        var geometry = navisworksObject.Geometry;
        var mode = converterSettings.Current.User.VisualRepresentationMode;

@@ -120,7 +137,7 @@ public class NavisworksMaterialUnpacker(

        if (renderMaterialProxies.TryGetValue(renderMaterialId.ToString(), out RenderMaterialProxy? value))
        {
-          value.objects.Add(finalId);
+          value.objects.Add(!string.IsNullOrEmpty(hashId) ? hashId : finalId);
        }
        else
        {
@@ -132,7 +149,7 @@ public class NavisworksMaterialUnpacker(
              renderColor,
              renderMaterialId
            ),
-            objects = [finalId]
+            objects = [!string.IsNullOrEmpty(hashId) ? hashId : finalId]
          };
        }
      }
@@ -6,6 +6,7 @@ using Speckle.Connectors.Common.Caching;
 using Speckle.Connectors.Common.Conversion;
 using Speckle.Connectors.Common.Operations;
 using Speckle.Converter.Navisworks.Helpers;
+using Speckle.Converter.Navisworks.Services;
 using Speckle.Converter.Navisworks.Settings;
 using Speckle.Converters.Common;
 using Speckle.Objects.Data;
@@ -25,7 +26,8 @@ public class NavisworksRootObjectBuilder(
  ISdkActivityFactory activityFactory,
  NavisworksMaterialUnpacker materialUnpacker,
  NavisworksColorUnpacker colorUnpacker,
-  IElementSelectionService elementSelectionService
+  IElementSelectionService elementSelectionService,
+  InstanceStoreManager instanceStoreManager
 ) : IRootObjectBuilder<NAV.ModelItem>
 {
  private bool SkipNodeMerging { get; set; }
@@ -41,7 +43,7 @@ public class NavisworksRootObjectBuilder(
  {
 #if DEBUG
    // This is a temporary workaround to disable node merging for debugging purposes - false is default, true is for debugging
-    SkipNodeMerging = false;
+    SkipNodeMerging = true;
 #endif
    using var activity = activityFactory.Start("Build");

@@ -50,22 +52,42 @@ public class NavisworksRootObjectBuilder(
    // 2. Initialize root collection
    var rootCollection = InitializeRootCollection();

+    // InstanceStoreManager is scoped - starts fresh for each conversion session
+
    // 3. Convert all model items and store results
-    var (convertedElements, conversionResults) = await ConvertModelItemsAsync(
-      navisworksModelItems,
-      projectId,
-      onOperationProgressed,
-      cancellationToken
-    );
+    (Dictionary<string, Base?> convertedElements, List<SendConversionResult> conversionResults) =
+      await ConvertModelItemsAsync(navisworksModelItems, projectId, onOperationProgressed, cancellationToken);

    ValidateConversionResults(conversionResults);

    var groupedNodes = SkipNodeMerging ? [] : GroupSiblingGeometryNodes(navisworksModelItems);
    var finalElements = BuildFinalElements(convertedElements, groupedNodes);
+    List<Base> geometryDefinitions = instanceStoreManager.GetGeometryDefinitions();

    await AddProxiesToCollection(rootCollection, navisworksModelItems, groupedNodes);

-    rootCollection.elements = finalElements;
+    // rootCollection.elements will contain two Collections: one for geometry definitions and one for the main elements
+
+    var geometryDefinitionsCollection = new Collection
+    {
+      name = "Geometry Definitions",
+      ["units"] = converterSettings.Current.Derived.SpeckleUnits,
+      elements = geometryDefinitions
+    };
+
+    var mainElementsCollection = new Collection
+    {
+      name = rootCollection.name,
+      ["units"] = converterSettings.Current.Derived.SpeckleUnits,
+      elements = finalElements
+    };
+
+    rootCollection.elements = [mainElementsCollection];
+    if (geometryDefinitions.Count > 0)
+    {
+      rootCollection.elements.Add(geometryDefinitionsCollection);
+    }
+
    return new RootObjectBuilderResult(rootCollection, conversionResults);
  }

@@ -288,6 +310,24 @@ public class NavisworksRootObjectBuilder(
      rootCollection[ProxyKeys.COLOR] = colors;
    }

+    // Add instance definition proxies from dual store
+    var instanceDefinitionProxies = instanceStoreManager.GetInstanceDefinitionProxies();
+    logger.LogDebug("Retrieved {Count} instance definition proxies from store", instanceDefinitionProxies.Count);
+
+    if (instanceDefinitionProxies.Count > 0)
+    {
+      rootCollection[ProxyKeys.INSTANCE_DEFINITION] = instanceDefinitionProxies.ToList();
+      logger.LogDebug(
+        "Added {Count} instance definition proxies to root collection under key '{Key}'",
+        instanceDefinitionProxies.Count,
+        ProxyKeys.INSTANCE_DEFINITION
+      );
+    }
+    else
+    {
+      logger.LogDebug("No instance definition proxies to add to root collection");
+    }
+
    return Task.CompletedTask;
  }

@@ -6,6 +6,7 @@ using Speckle.Connector.Navisworks.DependencyInjection;
 using Speckle.Connector.Navisworks.HostApp;
 using Speckle.Connector.Navisworks.Plugin.Tools;
 using Speckle.Connectors.Common;
+using Speckle.Connectors.Common.Operations;
 using Speckle.Connectors.DUI;
 using Speckle.Connectors.DUI.WebView;
 using Speckle.Converter.Navisworks.DependencyInjection;
@@ -46,6 +47,8 @@ internal sealed class Connector : NAV.Plugins.DockPanePlugin
    Container = services.BuildServiceProvider();
    Container.UseDUI();
    Container.GetRequiredService<NavisworksDocumentEvents>();
+    Container.GetRequiredService<ISerializationOptions>().SkipCacheRead = true;
+    Container.GetRequiredService<ISerializationOptions>().SkipCacheWrite = true;

    var u = Container.GetRequiredService<DUI3ControlWebView>();

@@ -281,9 +281,9 @@
        "dependencies": {
          "Microsoft.Extensions.DependencyInjection": "[2.2.0, )",
          "Speckle.Connectors.Logging": "[1.0.0, )",
-          "Speckle.Objects": "[3.5.4, )",
-          "Speckle.Sdk": "[3.5.4, )",
-          "Speckle.Sdk.Dependencies": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )",
+          "Speckle.Sdk": "[3.9.0, )",
+          "Speckle.Sdk.Dependencies": "[3.9.0, )"
        }
      },
      "speckle.connectors.dui": {
@@ -306,7 +306,7 @@
        "type": "Project",
        "dependencies": {
          "Microsoft.Extensions.Logging.Abstractions": "[2.2.0, )",
-          "Speckle.Objects": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )"
        }
      },
      "speckle.converters.revit2022": {
@@ -351,11 +351,11 @@
      },
      "Speckle.Objects": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o7ex4+yHJYI8pJbsjNqw+D8r8WjkBoB5aK/GQlGJd/0zydrPxN4SMKS4arpRBR3CUD6JhtQMatScXZOrslGXQg==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "fAOUhScCfDFVVynvipczjyw9RZlOgPOo8aH5A7EDAwZiDuDdd4EsnrqBCSPlmuoPYzY7hsN+5mfRkfw2rB36Ig==",
        "dependencies": {
-          "Speckle.Sdk": "3.5.4"
+          "Speckle.Sdk": "3.9.0"
        }
      },
      "Speckle.Revit.API": {
@@ -366,9 +366,9 @@
      },
      "Speckle.Sdk": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o4bEJTz+OBI1koy9xqXSIq3UtUFCKtk6Btg82rdVM2aFMPT3ZoYVarG+ylPcUOHd684XpgGASxE6dIgXz2pvng==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "GtbvnySinrE6Canm6fVjyUOxs4G1bw0aRLs9oPVMdodOKc9TxIQjp1lzVBtr6Jli+nzIxtC86xP5J6r9tufnrQ==",
        "dependencies": {
          "GraphQL.Client": "6.0.0",
          "Microsoft.Bcl.AsyncInterfaces": "5.0.0",
@@ -378,14 +378,14 @@
          "Microsoft.Extensions.Logging": "2.2.0",
          "Speckle.DoubleNumerics": "4.1.0",
          "Speckle.Newtonsoft.Json": "13.0.2",
-          "Speckle.Sdk.Dependencies": "3.5.4"
+          "Speckle.Sdk.Dependencies": "3.9.0"
        }
      },
      "Speckle.Sdk.Dependencies": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "d0ZOHiK11Hq9r7YEkfTvVu33ygWtsrgysIWdCRAz6rdlcAgMCEkWVBoe3jDjxdmUy20TToaQlFKfMH4hTyzWXg=="
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "m/3i+DX/1McN8ig0CcjmHM1BcNmNxgmny/735sKntzzDw23wdo868eOOTrogzmDoYHTyc7J4IjK+GE7iAyWn/g=="
      }
    }
  }
@@ -281,9 +281,9 @@
        "dependencies": {
          "Microsoft.Extensions.DependencyInjection": "[2.2.0, )",
          "Speckle.Connectors.Logging": "[1.0.0, )",
-          "Speckle.Objects": "[3.5.4, )",
-          "Speckle.Sdk": "[3.5.4, )",
-          "Speckle.Sdk.Dependencies": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )",
+          "Speckle.Sdk": "[3.9.0, )",
+          "Speckle.Sdk.Dependencies": "[3.9.0, )"
        }
      },
      "speckle.connectors.dui": {
@@ -306,7 +306,7 @@
        "type": "Project",
        "dependencies": {
          "Microsoft.Extensions.Logging.Abstractions": "[2.2.0, )",
-          "Speckle.Objects": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )"
        }
      },
      "speckle.converters.revit2023": {
@@ -351,11 +351,11 @@
      },
      "Speckle.Objects": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o7ex4+yHJYI8pJbsjNqw+D8r8WjkBoB5aK/GQlGJd/0zydrPxN4SMKS4arpRBR3CUD6JhtQMatScXZOrslGXQg==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "fAOUhScCfDFVVynvipczjyw9RZlOgPOo8aH5A7EDAwZiDuDdd4EsnrqBCSPlmuoPYzY7hsN+5mfRkfw2rB36Ig==",
        "dependencies": {
-          "Speckle.Sdk": "3.5.4"
+          "Speckle.Sdk": "3.9.0"
        }
      },
      "Speckle.Revit.API": {
@@ -366,9 +366,9 @@
      },
      "Speckle.Sdk": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o4bEJTz+OBI1koy9xqXSIq3UtUFCKtk6Btg82rdVM2aFMPT3ZoYVarG+ylPcUOHd684XpgGASxE6dIgXz2pvng==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "GtbvnySinrE6Canm6fVjyUOxs4G1bw0aRLs9oPVMdodOKc9TxIQjp1lzVBtr6Jli+nzIxtC86xP5J6r9tufnrQ==",
        "dependencies": {
          "GraphQL.Client": "6.0.0",
          "Microsoft.Bcl.AsyncInterfaces": "5.0.0",
@@ -378,14 +378,14 @@
          "Microsoft.Extensions.Logging": "2.2.0",
          "Speckle.DoubleNumerics": "4.1.0",
          "Speckle.Newtonsoft.Json": "13.0.2",
-          "Speckle.Sdk.Dependencies": "3.5.4"
+          "Speckle.Sdk.Dependencies": "3.9.0"
        }
      },
      "Speckle.Sdk.Dependencies": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "d0ZOHiK11Hq9r7YEkfTvVu33ygWtsrgysIWdCRAz6rdlcAgMCEkWVBoe3jDjxdmUy20TToaQlFKfMH4hTyzWXg=="
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "m/3i+DX/1McN8ig0CcjmHM1BcNmNxgmny/735sKntzzDw23wdo868eOOTrogzmDoYHTyc7J4IjK+GE7iAyWn/g=="
      }
    }
  }
@@ -281,9 +281,9 @@
        "dependencies": {
          "Microsoft.Extensions.DependencyInjection": "[2.2.0, )",
          "Speckle.Connectors.Logging": "[1.0.0, )",
-          "Speckle.Objects": "[3.5.4, )",
-          "Speckle.Sdk": "[3.5.4, )",
-          "Speckle.Sdk.Dependencies": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )",
+          "Speckle.Sdk": "[3.9.0, )",
+          "Speckle.Sdk.Dependencies": "[3.9.0, )"
        }
      },
      "speckle.connectors.dui": {
@@ -306,7 +306,7 @@
        "type": "Project",
        "dependencies": {
          "Microsoft.Extensions.Logging.Abstractions": "[2.2.0, )",
-          "Speckle.Objects": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )"
        }
      },
      "speckle.converters.revit2024": {
@@ -351,11 +351,11 @@
      },
      "Speckle.Objects": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o7ex4+yHJYI8pJbsjNqw+D8r8WjkBoB5aK/GQlGJd/0zydrPxN4SMKS4arpRBR3CUD6JhtQMatScXZOrslGXQg==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "fAOUhScCfDFVVynvipczjyw9RZlOgPOo8aH5A7EDAwZiDuDdd4EsnrqBCSPlmuoPYzY7hsN+5mfRkfw2rB36Ig==",
        "dependencies": {
-          "Speckle.Sdk": "3.5.4"
+          "Speckle.Sdk": "3.9.0"
        }
      },
      "Speckle.Revit.API": {
@@ -366,9 +366,9 @@
      },
      "Speckle.Sdk": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o4bEJTz+OBI1koy9xqXSIq3UtUFCKtk6Btg82rdVM2aFMPT3ZoYVarG+ylPcUOHd684XpgGASxE6dIgXz2pvng==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "GtbvnySinrE6Canm6fVjyUOxs4G1bw0aRLs9oPVMdodOKc9TxIQjp1lzVBtr6Jli+nzIxtC86xP5J6r9tufnrQ==",
        "dependencies": {
          "GraphQL.Client": "6.0.0",
          "Microsoft.Bcl.AsyncInterfaces": "5.0.0",
@@ -378,14 +378,14 @@
          "Microsoft.Extensions.Logging": "2.2.0",
          "Speckle.DoubleNumerics": "4.1.0",
          "Speckle.Newtonsoft.Json": "13.0.2",
-          "Speckle.Sdk.Dependencies": "3.5.4"
+          "Speckle.Sdk.Dependencies": "3.9.0"
        }
      },
      "Speckle.Sdk.Dependencies": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "d0ZOHiK11Hq9r7YEkfTvVu33ygWtsrgysIWdCRAz6rdlcAgMCEkWVBoe3jDjxdmUy20TToaQlFKfMH4hTyzWXg=="
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "m/3i+DX/1McN8ig0CcjmHM1BcNmNxgmny/735sKntzzDw23wdo868eOOTrogzmDoYHTyc7J4IjK+GE7iAyWn/g=="
      }
    }
  }
@@ -226,9 +226,9 @@
        "dependencies": {
          "Microsoft.Extensions.DependencyInjection": "[2.2.0, )",
          "Speckle.Connectors.Logging": "[1.0.0, )",
-          "Speckle.Objects": "[3.5.4, )",
-          "Speckle.Sdk": "[3.5.4, )",
-          "Speckle.Sdk.Dependencies": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )",
+          "Speckle.Sdk": "[3.9.0, )",
+          "Speckle.Sdk.Dependencies": "[3.9.0, )"
        }
      },
      "speckle.connectors.dui": {
@@ -251,7 +251,7 @@
        "type": "Project",
        "dependencies": {
          "Microsoft.Extensions.Logging.Abstractions": "[2.2.0, )",
-          "Speckle.Objects": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )"
        }
      },
      "speckle.converters.revit2025": {
@@ -296,11 +296,11 @@
      },
      "Speckle.Objects": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o7ex4+yHJYI8pJbsjNqw+D8r8WjkBoB5aK/GQlGJd/0zydrPxN4SMKS4arpRBR3CUD6JhtQMatScXZOrslGXQg==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "fAOUhScCfDFVVynvipczjyw9RZlOgPOo8aH5A7EDAwZiDuDdd4EsnrqBCSPlmuoPYzY7hsN+5mfRkfw2rB36Ig==",
        "dependencies": {
-          "Speckle.Sdk": "3.5.4"
+          "Speckle.Sdk": "3.9.0"
        }
      },
      "Speckle.Revit.API": {
@@ -311,9 +311,9 @@
      },
      "Speckle.Sdk": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o4bEJTz+OBI1koy9xqXSIq3UtUFCKtk6Btg82rdVM2aFMPT3ZoYVarG+ylPcUOHd684XpgGASxE6dIgXz2pvng==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "GtbvnySinrE6Canm6fVjyUOxs4G1bw0aRLs9oPVMdodOKc9TxIQjp1lzVBtr6Jli+nzIxtC86xP5J6r9tufnrQ==",
        "dependencies": {
          "GraphQL.Client": "6.0.0",
          "Microsoft.Data.Sqlite": "7.0.5",
@@ -321,14 +321,14 @@
          "Microsoft.Extensions.Logging": "2.2.0",
          "Speckle.DoubleNumerics": "4.1.0",
          "Speckle.Newtonsoft.Json": "13.0.2",
-          "Speckle.Sdk.Dependencies": "3.5.4"
+          "Speckle.Sdk.Dependencies": "3.9.0"
        }
      },
      "Speckle.Sdk.Dependencies": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "d0ZOHiK11Hq9r7YEkfTvVu33ygWtsrgysIWdCRAz6rdlcAgMCEkWVBoe3jDjxdmUy20TToaQlFKfMH4hTyzWXg=="
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "m/3i+DX/1McN8ig0CcjmHM1BcNmNxgmny/735sKntzzDw23wdo868eOOTrogzmDoYHTyc7J4IjK+GE7iAyWn/g=="
      }
    },
    "net8.0-windows7.0/win-x64": {
@@ -219,9 +219,9 @@
        "dependencies": {
          "Microsoft.Extensions.DependencyInjection": "[2.2.0, )",
          "Speckle.Connectors.Logging": "[1.0.0, )",
-          "Speckle.Objects": "[3.5.4, )",
-          "Speckle.Sdk": "[3.5.4, )",
-          "Speckle.Sdk.Dependencies": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )",
+          "Speckle.Sdk": "[3.9.0, )",
+          "Speckle.Sdk.Dependencies": "[3.9.0, )"
        }
      },
      "speckle.connectors.dui": {
@@ -244,7 +244,7 @@
        "type": "Project",
        "dependencies": {
          "Microsoft.Extensions.Logging.Abstractions": "[2.2.0, )",
-          "Speckle.Objects": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )"
        }
      },
      "speckle.converters.revit2026": {
@@ -280,11 +280,11 @@
      },
      "Speckle.Objects": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o7ex4+yHJYI8pJbsjNqw+D8r8WjkBoB5aK/GQlGJd/0zydrPxN4SMKS4arpRBR3CUD6JhtQMatScXZOrslGXQg==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "fAOUhScCfDFVVynvipczjyw9RZlOgPOo8aH5A7EDAwZiDuDdd4EsnrqBCSPlmuoPYzY7hsN+5mfRkfw2rB36Ig==",
        "dependencies": {
-          "Speckle.Sdk": "3.5.4"
+          "Speckle.Sdk": "3.9.0"
        }
      },
      "Speckle.Revit.API": {
@@ -295,9 +295,9 @@
      },
      "Speckle.Sdk": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o4bEJTz+OBI1koy9xqXSIq3UtUFCKtk6Btg82rdVM2aFMPT3ZoYVarG+ylPcUOHd684XpgGASxE6dIgXz2pvng==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "GtbvnySinrE6Canm6fVjyUOxs4G1bw0aRLs9oPVMdodOKc9TxIQjp1lzVBtr6Jli+nzIxtC86xP5J6r9tufnrQ==",
        "dependencies": {
          "GraphQL.Client": "6.0.0",
          "Microsoft.Data.Sqlite": "7.0.5",
@@ -305,14 +305,14 @@
          "Microsoft.Extensions.Logging": "2.2.0",
          "Speckle.DoubleNumerics": "4.1.0",
          "Speckle.Newtonsoft.Json": "13.0.2",
-          "Speckle.Sdk.Dependencies": "3.5.4"
+          "Speckle.Sdk.Dependencies": "3.9.0"
        }
      },
      "Speckle.Sdk.Dependencies": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "d0ZOHiK11Hq9r7YEkfTvVu33ygWtsrgysIWdCRAz6rdlcAgMCEkWVBoe3jDjxdmUy20TToaQlFKfMH4hTyzWXg=="
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "m/3i+DX/1McN8ig0CcjmHM1BcNmNxgmny/735sKntzzDw23wdo868eOOTrogzmDoYHTyc7J4IjK+GE7iAyWn/g=="
      }
    },
    "net8.0-windows7.0/win-x64": {
@@ -1,3 +1,4 @@
+using System.Runtime.InteropServices;
 using System.Windows.Controls;
 using System.Windows.Threading;
 using Autodesk.Revit.UI;
@@ -31,6 +32,10 @@ public partial class CefSharpPanel : Page, Autodesk.Revit.UI.IDockablePaneProvid
        DispatcherPriority.Background
      );
    }
+    catch (SEHException)
+    {
+      //do nothing as we can't control external components
+    }
    catch (OperationCanceledException)
    {
      //do nothing, happens when closing Revit while a script is being executed
@@ -106,7 +106,7 @@ internal sealed class BasicConnectorBindingRevit : IBasicConnectorBinding

      if (senderModelCard.SendFilter is RevitViewsFilter revitViewsFilter)
      {
-        var view = revitViewsFilter.GetView();
+        var view = revitViewsFilter.GetView(activeUIDoc.Document);
        if (view is not null)
        {
          await _revitTask
@@ -29,9 +29,11 @@ internal sealed class RevitSendBinding : RevitBaseBinding, ISendBinding
  private readonly DocumentModelStore _store;
  private readonly ICancellationManager _cancellationManager;
  private readonly ISendConversionCache _sendConversionCache;
+
  private readonly ToSpeckleSettingsManager _toSpeckleSettingsManager;
  private readonly ElementUnpacker _elementUnpacker;
  private readonly IRevitConversionSettingsFactory _revitConversionSettingsFactory;
+  private readonly RevitToSpeckleCacheSingleton _revitToSpeckleCacheSingleton;
  private readonly ITopLevelExceptionHandler _topLevelExceptionHandler;
  private readonly LinkedModelHandler _linkedModelHandler;
  private readonly IThreadContext _threadContext;
@@ -55,6 +57,7 @@ internal sealed class RevitSendBinding : RevitBaseBinding, ISendBinding
    ToSpeckleSettingsManager toSpeckleSettingsManager,
    ElementUnpacker elementUnpacker,
    IRevitConversionSettingsFactory revitConversionSettingsFactory,
+    RevitToSpeckleCacheSingleton revitToSpeckleCacheSingleton,
    ITopLevelExceptionHandler topLevelExceptionHandler,
    LinkedModelHandler linkedModelHandler,
    IThreadContext threadContext,
@@ -71,6 +74,7 @@ internal sealed class RevitSendBinding : RevitBaseBinding, ISendBinding
    _toSpeckleSettingsManager = toSpeckleSettingsManager;
    _elementUnpacker = elementUnpacker;
    _revitConversionSettingsFactory = revitConversionSettingsFactory;
+    _revitToSpeckleCacheSingleton = revitToSpeckleCacheSingleton;
    _topLevelExceptionHandler = topLevelExceptionHandler;
    _linkedModelHandler = linkedModelHandler;
    _threadContext = threadContext;
@@ -110,6 +114,11 @@ internal sealed class RevitSendBinding : RevitBaseBinding, ISendBinding

  public async Task Send(string modelCardId)
  {
+    var document = _revitContext.UIApplication?.ActiveUIDocument?.Document;
+    if (document == null)
+    {
+      throw new SpeckleException("No document is active for sending.");
+    }
    using var manager = _sendOperationManagerFactory.Create();

    await manager.Process<DocumentToConvert>(
@@ -120,24 +129,20 @@ internal sealed class RevitSendBinding : RevitBaseBinding, ISendBinding
        sp.GetRequiredService<IConverterSettingsStore<RevitConversionSettings>>()
          .Initialize(
            _revitConversionSettingsFactory.Create(
-              _toSpeckleSettingsManager.GetDetailLevelSetting(card),
-              _toSpeckleSettingsManager.GetReferencePointSetting(card),
-              _toSpeckleSettingsManager.GetSendParameterNullOrEmptyStringsSetting(card),
-              _toSpeckleSettingsManager.GetLinkedModelsSetting(card),
-              _toSpeckleSettingsManager.GetSendRebarsAsVolumetric(card)
+              _toSpeckleSettingsManager.GetDetailLevelSetting(document, card),
+              _toSpeckleSettingsManager.GetReferencePointSetting(document, card),
+              _toSpeckleSettingsManager.GetSendParameterNullOrEmptyStringsSetting(document, card),
+              _toSpeckleSettingsManager.GetLinkedModelsSetting(document, card),
+              _toSpeckleSettingsManager.GetSendRebarsAsVolumetric(document, card)
            )
          );
      },
-      async x => await RefreshElementsIdsOnSender(x.NotNull())
+      async x => await RefreshElementsIdsOnSender(document, x.NotNull())
    );
  }

-  private async Task<List<DocumentToConvert>> RefreshElementsIdsOnSender(SenderModelCard modelCard)
+  private async Task<List<DocumentToConvert>> RefreshElementsIdsOnSender(Document document, SenderModelCard modelCard)
  {
-    var activeUIDoc =
-      _revitContext.UIApplication?.ActiveUIDocument
-      ?? throw new SpeckleException("Unable to retrieve active UI document");
-
    if (modelCard.SendFilter.NotNull() is IRevitSendFilter viewFilter)
    {
      viewFilter.SetContext(_revitContext);
@@ -147,10 +152,7 @@ internal sealed class RevitSendBinding : RevitBaseBinding, ISendBinding
      () => Task.FromResult(modelCard.SendFilter.NotNull().RefreshObjectIds())
    );

-    var allElements = selectedObjects
-      .Select(uid => activeUIDoc.Document.GetElement(uid))
-      .Where(el => el is not null)
-      .ToList();
+    var allElements = selectedObjects.Select(uid => document.GetElement(uid)).Where(el => el is not null).ToList();

    // split elements between main model and linked models
    var elementsOnMainModel = allElements.Where(el => el is not RevitLinkInstance).ToList();
@@ -158,14 +160,11 @@ internal sealed class RevitSendBinding : RevitBaseBinding, ISendBinding

    // should ideally reuse the initialized value from the scoped IConverterSettingsStore<RevitConversionSettings>.
    // but, it's scoped and to avoid bigger scarier changes I'm re-fetching the setting here (inexpensive operation?)
-    Transform? mainModelTransform = _toSpeckleSettingsManager.GetReferencePointSetting(modelCard);
-    List<DocumentToConvert> documentElementContexts =
-    [
-      new(mainModelTransform, activeUIDoc.Document, elementsOnMainModel)
-    ];
+    Transform? mainModelTransform = _toSpeckleSettingsManager.GetReferencePointSetting(document, modelCard);
+    List<DocumentToConvert> documentElementContexts = [new(mainModelTransform, document, elementsOnMainModel)];

    // get the linked models setting - this decision belongs at this level
-    bool includeLinkedModels = _toSpeckleSettingsManager.GetLinkedModelsSetting(modelCard);
+    bool includeLinkedModels = _toSpeckleSettingsManager.GetLinkedModelsSetting(document, modelCard);

    // ⚠️ process linked models - RevitSendBinding controls the flow based on settings!
    // If setting not enabled, we won't unpack (see if-else block)
@@ -192,7 +191,12 @@ internal sealed class RevitSendBinding : RevitBaseBinding, ISendBinding
        if (includeLinkedModels)
        {
          // handler is only responsible for element collection mechanics
-          var linkedElements = _linkedModelHandler.GetLinkedModelElements(modelCard.SendFilter, linkedDoc, transform);
+          var linkedElements = _linkedModelHandler.GetLinkedModelElements(
+            document,
+            modelCard.SendFilter,
+            linkedDoc,
+            transform
+          );
          linkedDocumentContexts.Add(new(transform, linkedDoc, linkedElements));
        }
        // ⚠️ when disabled, still adds empty contexts to maintain warning generation in RevitRootObjectBuilder
@@ -332,9 +336,14 @@ internal sealed class RevitSendBinding : RevitBaseBinding, ISendBinding

  private async Task PostSetObjectIds()
  {
+    var document = _revitContext.UIApplication?.ActiveUIDocument?.Document;
+    if (document == null)
+    {
+      return;
+    }
    foreach (var sender in _store.GetSenders().ToList())
    {
-      await RefreshElementsIdsOnSender(sender);
+      await RefreshElementsIdsOnSender(document, sender);
    }
  }

@@ -444,6 +453,7 @@ internal sealed class RevitSendBinding : RevitBaseBinding, ISendBinding
  private async Task OnDocumentChanged()
  {
    _sendConversionCache.ClearCache();
+    _revitToSpeckleCacheSingleton.ClearCache();

    if (_cancellationManager.NumberOfOperations > 0)
    {
@@ -34,18 +34,22 @@ public class LevelUnpacker
    Dictionary<string, LevelProxy> levelProxies = new();
    foreach (var element in elements)
    {
-      if (levelProxies.TryGetValue(element.LevelId.ToString(), out LevelProxy? levelProxy))
+      // NOTE: Use level.UniqueId (not element.LevelId) as key
+      // face-based instances don't have a valid element.LevelId, hence all the changes in the LevelExtractor
+      var level = _levelExtractor.GetLevel(element);
+      if (level is null)
+      {
+        continue;
+      }
+
+      string levelKey = level.UniqueId;
+
+      if (levelProxies.TryGetValue(levelKey, out LevelProxy? levelProxy))
      {
        levelProxy.objects.Add(element.UniqueId);
      }
      else
      {
-        var level = _levelExtractor.GetLevel(element);
-        if (level is null)
-        {
-          continue;
-        }
-
        var levelDataObject = new DataObject()
        {
          name = level.Name,
@@ -53,11 +57,11 @@ public class LevelUnpacker
          properties = _propertiesExtractor.GetProperties(level)
        };
        var unitSettings = _converterSettings.Current.Document.GetUnits();
-        var lengthUnitType = unitSettings.GetFormatOptions(Autodesk.Revit.DB.SpecTypeId.Length).GetUnitTypeId();
+        var lengthUnitType = unitSettings.GetFormatOptions(SpecTypeId.Length).GetUnitTypeId();
        levelDataObject["elevation"] = UnitUtils.ConvertFromInternalUnits(level.Elevation, lengthUnitType);
        levelDataObject["units"] = _converterSettings.Current.SpeckleUnits;

-        levelProxies[element.LevelId.ToString()] = new LevelProxy()
+        levelProxies[levelKey] = new LevelProxy()
        {
          applicationId = level.UniqueId,
          objects = [element.UniqueId],
@@ -3,7 +3,6 @@ using Autodesk.Revit.DB;
 using Speckle.Connectors.DUI.Models.Card.SendFilter;
 using Speckle.Connectors.RevitShared;
 using Speckle.Connectors.RevitShared.Operations.Send.Filters;
-using Speckle.Converters.RevitShared.Helpers;
 using Speckle.Sdk;
 using Speckle.Sdk.Common;

@@ -17,20 +16,19 @@ namespace Speckle.Connectors.Revit.HostApp;
 /// </summary>
 public class LinkedModelHandler
 {
-  private readonly RevitContext _revitContext;
  public Dictionary<string, string> LinkedModelDisplayNames { get; } = new();

-  public LinkedModelHandler(RevitContext revitContext)
-  {
-    _revitContext = revitContext;
-  }
-
  /// <summary>
  /// Gets elements from a linked document based on the provided send filter.
  /// This method handles the specifics of element collection but doesn't make decisions
  /// about whether the linked model should be processed - that's the caller's responsibility.
  /// </summary>
-  public List<Element> GetLinkedModelElements(ISendFilter sendFilter, Document linkedDocument, Transform? transform)
+  public List<Element> GetLinkedModelElements(
+    Document currentDocument,
+    ISendFilter sendFilter,
+    Document linkedDocument,
+    Transform? transform
+  )
  {
    // send mode → Categories
    if (sendFilter is RevitCategoriesFilter categoryFilter && categoryFilter.SelectedCategories is not null)
@@ -48,19 +46,15 @@ public class LinkedModelHandler
    }

    // send mode → Views (taken from the legacy code)
-    if (sendFilter is RevitViewsFilter viewFilter && viewFilter.GetView() != null)
+    if (sendFilter is RevitViewsFilter viewFilter && viewFilter.GetView(currentDocument) != null)
    {
-      RevitLinkInstance linkInstance = FindLinkInstanceForDocument(
-        linkedDocument.PathName,
-        _revitContext.UIApplication.NotNull().ActiveUIDocument.Document,
-        transform
-      );
+      RevitLinkInstance linkInstance = FindLinkInstanceForDocument(linkedDocument.PathName, currentDocument, transform);

 #if REVIT2024_OR_GREATER
      // revit 2024 and 2025 we can use the three-parameter constructor to get only visible elements
      using var viewCollector = new FilteredElementCollector(
-        _revitContext.UIApplication.ActiveUIDocument.Document,
-        viewFilter.GetView().NotNull().Id,
+        currentDocument,
+        viewFilter.GetView(currentDocument).NotNull().Id,
        linkInstance.Id
      );

@@ -70,7 +64,7 @@ public class LinkedModelHandler
      // 🚨 LIMITATION: in Revit 2023 and below, we can only check if the entire linked model is visible,
      // not individual elements within it. If the linked model is visible, all its elements will be included.
      // constructor overload pertaining to searching and filtering visible elements from a revit link only added 2024.
-      if (linkInstance.IsHidden(viewFilter.GetView().NotNull()))
+      if (linkInstance.IsHidden(viewFilter.GetView(currentDocument).NotNull()))
      {
        return new List<Element>(); // if the linked model is hidden, return no elements
      }
@@ -97,10 +97,12 @@ internal sealed class RevitDocumentStore : DocumentModelStore
    try
    {
      var key = GetKeyForDocument(document);
-      if (key != null)
+      if (key is null)
      {
-        _jsonCacheManager.UpdateObject(key, modelCardState);
+        LoadFromString(null);
+        return;
      }
+      _jsonCacheManager.UpdateObject(key, modelCardState);
    }
    catch (Exception ex) when (!ex.IsFatal())
    {
@@ -111,11 +113,17 @@ internal sealed class RevitDocumentStore : DocumentModelStore

  private string? GetKeyForDocument(Document doc)
  {
-    string? id = doc?.ProjectInformation?.UniqueId; //ProjectInformation Should only be null for family docs
-#if REVIT_2024_OR_GREATER
-    id ??= doc.CreationGUID.ToString(); //fallback for family docs
+#if REVIT2024_OR_GREATER
+    return doc.CreationGUID.ToString();
+#else
+    //basically, no document state will ever be saved when it's a new document.  It must be saved first for path name to be a valid value.
+    var x = doc.PathName;
+    if (string.IsNullOrEmpty(x))
+    {
+      return doc.Title;
+    }
+    return x;
 #endif
-    return id;
  }

  protected override void LoadState()
@@ -128,14 +136,12 @@ internal sealed class RevitDocumentStore : DocumentModelStore
    }

    var key = GetKeyForDocument(document);
-    if (key != null)
+    if (key is null)
    {
-      var state = _jsonCacheManager.GetObject(key);
-      if (state == null)
-      {
-        return;
-      }
-      LoadFromString(state);
+      LoadFromString(null);
+      return;
    }
+    var state = _jsonCacheManager.GetObject(key);
+    LoadFromString(state);
  }
 }
@@ -120,9 +120,14 @@ public class RevitMaterialBaker

      try
      {
+        // all values assumed to be on the 0 - 1 scale need to pass through this validation and logging (if assumption wrong)
+        double roughness = ClampToUnitRange(speckleRenderMaterial.roughness, "roughness", speckleRenderMaterial.name);
+        double opacity = ClampToUnitRange(speckleRenderMaterial.opacity, "opacity", speckleRenderMaterial.name);
+        double metalness = ClampToUnitRange(speckleRenderMaterial.metalness, "metalness", speckleRenderMaterial.name);
+
        var diffuse = System.Drawing.Color.FromArgb(speckleRenderMaterial.diffuse);
-        double transparency = 1 - speckleRenderMaterial.opacity;
-        double smoothness = 1 - speckleRenderMaterial.roughness;
+        double transparency = 1 - opacity;
+        double smoothness = 1 - roughness;
        string materialId = speckleRenderMaterial.applicationId ?? speckleRenderMaterial.id.NotNull();
        string matName = _revitUtils.RemoveInvalidChars($"{speckleRenderMaterial.name}-({materialId})-{baseLayerName}");

@@ -130,7 +135,7 @@ public class RevitMaterialBaker
        var revitMaterial = (Material)_converterSettings.Current.Document.GetElement(newMaterialId);
        revitMaterial.Color = new Color(diffuse.R, diffuse.G, diffuse.B);
        revitMaterial.Transparency = (int)(transparency * 100);
-        revitMaterial.Shininess = (int)(speckleRenderMaterial.metalness * 128);
+        revitMaterial.Shininess = (int)(metalness * 128);
        revitMaterial.Smoothness = (int)(smoothness * 128);

        foreach (var objectId in proxy.objects)
@@ -163,4 +168,30 @@ public class RevitMaterialBaker
      document.Delete(materialIds);
    }
  }
+
+  /// <summary>
+  /// After CNX-2661, we've seen some edge cases contradicting the expected 0 - 1 range for PRB properties.
+  /// Defensively, we'd rather clamp these values than throw.
+  /// </summary>
+  /// <remarks>
+  /// Created a method so that we can extend the checks to any numerical value potentially leading to a negative value,
+  /// which would throw an exception. Generalised method since Math.Clamp() only available since C# 8.0 and this method
+  /// handles logging (in the hope that we can get a better feel for these "weird" models, e.g. 0 - 100 scale??)
+  /// </remarks>
+  private double ClampToUnitRange(double value, string propertyName, string materialName)
+  {
+    if (value is < 0 or > 1)
+    {
+      _logger.LogWarning(
+        "Material '{MaterialName}' has an invalid {PropertyName} value of {Value} and was clamped to 0 - 1 range",
+        materialName,
+        propertyName,
+        value
+      );
+
+      value = Math.Min(Math.Max(0, value), 1);
+    }
+
+    return value;
+  }
 }
@@ -66,8 +66,8 @@ public sealed class RevitHostObjectBuilder(
    // TODO: formalise getting transform info from rootObject. this dict access is gross.
    Autodesk.Revit.DB.Transform? referencePointTransformFromRootObject = null;
    if (
-      rootObject.DynamicPropertyKeys.Contains(ReferencePointHelper.REFERENCE_POINT_TRANSFORM_KEY)
-      && rootObject[ReferencePointHelper.REFERENCE_POINT_TRANSFORM_KEY] is Dictionary<string, object> transformDict
+      rootObject.DynamicPropertyKeys.Contains(RootKeys.REFERENCE_POINT_TRANSFORM)
+      && rootObject[RootKeys.REFERENCE_POINT_TRANSFORM] is Dictionary<string, object> transformDict
      && transformDict.TryGetValue("transform", out var transformValue)
    )
    {
@@ -110,7 +110,8 @@ public sealed class RevitHostObjectBuilder(
    // TODO: TransformTo and material baking needs to be fixed in Revit!!

    // create a mapping from original to modified IDs <- so that we can actually map ids in the proxies to the objects
-    Dictionary<string, string> originalToModifiedIds = new();
+    // as part of CNX-2677, we have a one-to-many problem. many instances share the same reference, so we use a list
+    Dictionary<string, List<string>> originalToModifiedIds = new();

    // modify application IDs BEFORE material baking
    foreach (LocalToGlobalMap localToGlobalMap in localToGlobalMaps)
@@ -139,7 +140,13 @@ public sealed class RevitHostObjectBuilder(
        string modifiedAppId = $"{originalAppId}_{Guid.NewGuid().ToString("N")[..8]}";
        if (originalAppId != null)
        {
-          originalToModifiedIds[originalAppId] = modifiedAppId;
+          if (!originalToModifiedIds.TryGetValue(originalAppId, out List<string>? modifiedIds))
+          {
+            modifiedIds = new List<string>();
+            originalToModifiedIds[originalAppId] = modifiedIds;
+          }
+
+          modifiedIds.Add(modifiedAppId);
        }

        localToGlobalMap.AtomicObject.applicationId = modifiedAppId;
@@ -152,14 +159,20 @@ public sealed class RevitHostObjectBuilder(
    {
      foreach (var proxy in unpackedRoot.RenderMaterialProxies)
      {
-        var updatedObjects = new List<string>();
+        var objectIdsToUse = new List<string>();
        foreach (var objectId in proxy.objects)
        {
          // Use the modified ID if it exists, otherwise keep the original <- this SUCKS and we need to change
-          string idToUse = originalToModifiedIds.TryGetValue(objectId, out var modifiedId) ? modifiedId : objectId;
-          updatedObjects.Add(idToUse);
+          if (originalToModifiedIds.TryGetValue(objectId, out var modifiedIds))
+          {
+            objectIdsToUse.AddRange(modifiedIds);
+          }
+          else
+          {
+            objectIdsToUse.Add(objectId);
+          }
        }
-        proxy.objects = updatedObjects;
+        proxy.objects = objectIdsToUse;
      }
    }

@@ -11,14 +11,13 @@ namespace Speckle.Connectors.RevitShared.Operations.Send.Filters;
 public class RevitViewsFilter : DiscriminatedObject, ISendFilter, IRevitSendFilter
 {
  private RevitContext _revitContext;
-  private Document? _doc;
  public string Id { get; set; } = "revitViews";
  public string Name { get; set; } = "Views";
  public string Type { get; set; } = "Custom";
  public string? Summary { get; set; }
  public bool IsDefault { get; set; }
  public string? SelectedView { get; set; }
-  public List<string> SelectedObjectIds { get; set; }
+  public List<string> SelectedObjectIds { get; set; } = new();
  public Dictionary<string, string>? IdMap { get; set; } = new();
  public List<string>? AvailableViews { get; set; }

@@ -27,12 +26,14 @@ public class RevitViewsFilter : DiscriminatedObject, ISendFilter, IRevitSendFilt
  public RevitViewsFilter(RevitContext revitContext)
  {
    _revitContext = revitContext;
-    _doc = _revitContext.UIApplication?.ActiveUIDocument?.Document;
-
-    GetViews();
+    var doc = _revitContext.UIApplication?.ActiveUIDocument?.Document;
+    if (doc is not null)
+    {
+      GetViews(doc);
+    }
  }

-  public View? GetView()
+  public View? GetView(Document document)
  {
    if (SelectedView is null)
    {
@@ -42,7 +43,7 @@ public class RevitViewsFilter : DiscriminatedObject, ISendFilter, IRevitSendFilt
    var viewFamilyString = result[0];
    var viewString = result[1];

-    using var collector = new FilteredElementCollector(_doc);
+    using var collector = new FilteredElementCollector(document);
    return collector
      .OfClass(typeof(View))
      .Cast<View>()
@@ -56,7 +57,8 @@ public class RevitViewsFilter : DiscriminatedObject, ISendFilter, IRevitSendFilt
  /// <exception cref="SpeckleSendFilterException">Whenever no view is found.</exception>
  public List<string> RefreshObjectIds()
  {
-    if (SelectedView is null)
+    var document = _revitContext.UIApplication?.ActiveUIDocument?.Document;
+    if (SelectedView is null || document is null)
    {
      return [];
    }
@@ -66,7 +68,7 @@ public class RevitViewsFilter : DiscriminatedObject, ISendFilter, IRevitSendFilt
    var viewFamilyString = result[0];
    var viewString = result[1];

-    using var collector = new FilteredElementCollector(_doc);
+    using var collector = new FilteredElementCollector(document);
    View? view = collector
      .OfClass(typeof(View))
      .Cast<View>()
@@ -78,7 +80,7 @@ public class RevitViewsFilter : DiscriminatedObject, ISendFilter, IRevitSendFilt
      return [];
    }

-    IEnumerable<Element> elementsInView = GetFilteredElementsForView(view);
+    IEnumerable<Element> elementsInView = GetFilteredElementsForView(document, view);

    // NOTE: FilteredElementCollector() includes sweeps and reveals from a wall family's definition and includes them as additional objects
    // on this return. displayValue for Wall already includes these, therefore we end up with duplicate elements on wall sweeps
@@ -94,9 +96,9 @@ public class RevitViewsFilter : DiscriminatedObject, ISendFilter, IRevitSendFilt
    return objectIds;
  }

-  private void GetViews()
+  private void GetViews(Document document)
  {
-    using var collector = new FilteredElementCollector(_doc);
+    using var collector = new FilteredElementCollector(document);
    var views = collector
      .OfClass(typeof(View))
      .Cast<View>()
@@ -125,7 +127,6 @@ public class RevitViewsFilter : DiscriminatedObject, ISendFilter, IRevitSendFilt
  public void SetContext(RevitContext revitContext)
  {
    _revitContext = revitContext;
-    _doc = _revitContext.UIApplication?.ActiveUIDocument.Document;
  }

  // NOTE: Element collector returns parts and source elements even when Parts Visibility is set as "Show Parts" only.
@@ -161,9 +162,9 @@ public class RevitViewsFilter : DiscriminatedObject, ISendFilter, IRevitSendFilt
    return elementsToExclude;
  }

-  private IEnumerable<Element> GetFilteredElementsForView(View view)
+  private IEnumerable<Element> GetFilteredElementsForView(Document document, View view)
  {
-    using var viewCollector = new FilteredElementCollector(_doc, view.Id);
+    using var viewCollector = new FilteredElementCollector(document, view.Id);
    var allElements = viewCollector.ToElements();

    // parts filtering when view is set to show Parts only (and overwrites allElements)
@@ -183,6 +183,7 @@ public class RevitRootObjectBuilder(
            // non-transformed elements can safely rely on cache
            // TODO: Potential here to transform cached objects and NOT reconvert,
            // TODO: we wont do !hasTransform here, and re-set application id before this
+
            if (!hasTransform && sendConversionCache.TryGetValue(projectId, applicationId, out ObjectReference? value))
            {
              converted = value;
@@ -248,6 +249,17 @@ public class RevitRootObjectBuilder(
    var levelProxies = levelUnpacker.Unpack(flatElements);
    rootObject[ProxyKeys.LEVEL] = levelProxies;

+    rootObject[ProxyKeys.INSTANCE_DEFINITION] = revitToSpeckleCacheSingleton.GetInstanceDefinitionProxiesForObjects(
+      idsAndSubElementIds
+    );
+    rootObject.elements.Add(
+      new Collection()
+      {
+        elements = revitToSpeckleCacheSingleton.GetBaseObjectsForObjects(idsAndSubElementIds),
+        name = "revitInstancedObjects"
+      }
+    );
+
    // NOTE: these are currently not used anywhere, we'll skip them until someone calls for it back
    // rootObject[ProxyKeys.PARAMETER_DEFINITIONS] = _parameterDefinitionHandler.Definitions;

@@ -255,7 +267,7 @@ public class RevitRootObjectBuilder(
    if (converterSettings.Current.ReferencePointTransform is Transform transform)
    {
      var transformMatrix = ReferencePointHelper.CreateTransformDataForRootObject(transform);
-      rootObject[ReferencePointHelper.REFERENCE_POINT_TRANSFORM_KEY] = transformMatrix;
+      rootObject[RootKeys.REFERENCE_POINT_TRANSFORM] = transformMatrix;
    }

    return new RootObjectBuilderResult(rootObject, results);
@@ -1,25 +1,21 @@
 using Autodesk.Revit.DB;
-using Autodesk.Revit.UI;
 using Microsoft.Extensions.Logging;
 using Speckle.Connectors.Common.Caching;
 using Speckle.Connectors.DUI.Models.Card;
 using Speckle.Connectors.Revit.HostApp;
-using Speckle.Converters.RevitShared.Helpers;
 using Speckle.Converters.RevitShared.Settings;
 using Speckle.InterfaceGenerator;
-using Speckle.Sdk;
 using Speckle.Sdk.Common;

 namespace Speckle.Connectors.Revit.Operations.Send.Settings;

 [GenerateAutoInterface]
-public class ToSpeckleSettingsManager : IToSpeckleSettingsManager
+public class ToSpeckleSettingsManager(
+  ISendConversionCache sendConversionCache,
+  ElementUnpacker elementUnpacker,
+  ILogger<ToSpeckleSettingsManager> logger
+) : IToSpeckleSettingsManager
 {
-  private readonly RevitContext _revitContext;
-  private readonly ISendConversionCache _sendConversionCache;
-  private readonly ElementUnpacker _elementUnpacker;
-  private readonly ILogger<ToSpeckleSettingsManager> _logger;
-
  // cache invalidation process run with ModelCardId since the settings are model specific
  private readonly Dictionary<string, DetailLevelType> _detailLevelCache = [];
  private readonly Dictionary<string, Transform?> _referencePointCache = [];
@@ -27,20 +23,7 @@ public class ToSpeckleSettingsManager : IToSpeckleSettingsManager
  private readonly Dictionary<string, bool?> _sendLinkedModelsCache = [];
  private readonly Dictionary<string, bool?> _sendRebarsAsVolumetricCache = [];

-  public ToSpeckleSettingsManager(
-    RevitContext revitContext,
-    ISendConversionCache sendConversionCache,
-    ElementUnpacker elementUnpacker,
-    ILogger<ToSpeckleSettingsManager> logger
-  )
-  {
-    _revitContext = revitContext;
-    _elementUnpacker = elementUnpacker;
-    _sendConversionCache = sendConversionCache;
-    _logger = logger;
-  }
-
-  public DetailLevelType GetDetailLevelSetting(SenderModelCard modelCard)
+  public DetailLevelType GetDetailLevelSetting(Document document, SenderModelCard modelCard)
  {
    var fidelityString =
      modelCard.Settings?.FirstOrDefault(s => s.Id == DetailLevelSetting.SETTING_ID)?.Value as string;
@@ -53,7 +36,7 @@ public class ToSpeckleSettingsManager : IToSpeckleSettingsManager
      {
        if (previousType != fidelity)
        {
-          EvictCacheForModelCard(modelCard);
+          EvictCacheForModelCard(document, modelCard);
        }
      }
      _detailLevelCache[modelCard.ModelCardId.NotNull()] = fidelity;
@@ -61,7 +44,7 @@ public class ToSpeckleSettingsManager : IToSpeckleSettingsManager
    }

    // log the issue
-    _logger.LogWarning(
+    logger.LogWarning(
      "Invalid detail level setting received: '{FidelityString}' for model {ModelCardId}, using default: {DefaultValue}",
      fidelityString,
      modelCard.ModelCardId,
@@ -74,7 +57,7 @@ public class ToSpeckleSettingsManager : IToSpeckleSettingsManager
    return defaultValue;
  }

-  public Transform? GetReferencePointSetting(ModelCard modelCard)
+  public Transform? GetReferencePointSetting(Document document, ModelCard modelCard)
  {
    var referencePointString =
      modelCard.Settings?.FirstOrDefault(s => s.Id == SendReferencePointSetting.SETTING_ID)?.Value as string;
@@ -88,14 +71,14 @@ public class ToSpeckleSettingsManager : IToSpeckleSettingsManager
    {
      // get the current transform from setting first
      // we are doing this because we can't track if reference points were changed between send operations.
-      Transform? currentTransform = GetTransform(referencePoint);
+      Transform? currentTransform = GetTransform(document, referencePoint);

      if (_referencePointCache.TryGetValue(modelCard.ModelCardId.NotNull(), out Transform? previousTransform))
      {
        // invalidate conversion cache if the transform has changed
        if (modelCard is SenderModelCard senderModelCard && previousTransform != currentTransform)
        {
-          EvictCacheForModelCard(senderModelCard);
+          EvictCacheForModelCard(document, senderModelCard);
        }
      }

@@ -104,7 +87,7 @@ public class ToSpeckleSettingsManager : IToSpeckleSettingsManager
    }

    // log the issue
-    _logger.LogWarning(
+    logger.LogWarning(
      "Invalid reference point setting received: '{ReferencePointString}' for model {ModelCardId}, using default: {DefaultValue}",
      referencePointString,
      modelCard.ModelCardId,
@@ -116,8 +99,9 @@ public class ToSpeckleSettingsManager : IToSpeckleSettingsManager
    return null;
  }

-  public bool GetSendParameterNullOrEmptyStringsSetting(SenderModelCard modelCard) =>
+  public bool GetSendParameterNullOrEmptyStringsSetting(Document document, SenderModelCard modelCard) =>
    GetBooleanSettingWithCache(
+      document,
      SendParameterNullOrEmptyStringsSetting.SETTING_ID,
      SendParameterNullOrEmptyStringsSetting.DEFAULT_VALUE,
      modelCard,
@@ -127,8 +111,9 @@ public class ToSpeckleSettingsManager : IToSpeckleSettingsManager

  // NOTE: Cache invalidation currently a placeholder until we have more understanding on the sends
  // TODO: Evaluate cache invalidation for GetLinkedModelsSetting
-  public bool GetLinkedModelsSetting(SenderModelCard modelCard) =>
+  public bool GetLinkedModelsSetting(Document document, SenderModelCard modelCard) =>
    GetBooleanSettingWithCache(
+      document,
      LinkedModelsSetting.SETTING_ID,
      LinkedModelsSetting.DEFAULT_VALUE,
      modelCard,
@@ -136,8 +121,9 @@ public class ToSpeckleSettingsManager : IToSpeckleSettingsManager
      "Linked models"
    );

-  public bool GetSendRebarsAsVolumetric(SenderModelCard modelCard) =>
+  public bool GetSendRebarsAsVolumetric(Document document, SenderModelCard modelCard) =>
    GetBooleanSettingWithCache(
+      document,
      SendRebarsAsVolumetricSetting.SETTING_ID,
      SendRebarsAsVolumetricSetting.DEFAULT_VALUE,
      modelCard,
@@ -149,6 +135,7 @@ public class ToSpeckleSettingsManager : IToSpeckleSettingsManager
  /// Helper method to handle boolean settings with caching and logging
  /// </summary>
  private bool GetBooleanSettingWithCache(
+    Document document,
    string settingId,
    bool defaultValue,
    SenderModelCard modelCard,
@@ -163,7 +150,7 @@ public class ToSpeckleSettingsManager : IToSpeckleSettingsManager
    {
      if (previousValue != returnValue)
      {
-        EvictCacheForModelCard(modelCard);
+        EvictCacheForModelCard(document, modelCard);
      }
    }

@@ -173,7 +160,7 @@ public class ToSpeckleSettingsManager : IToSpeckleSettingsManager
    // respected (linked models disabled but still sent linked models), I think we should note this occurence so we know
    if (settingValue == null)
    {
-      _logger.LogWarning(
+      logger.LogWarning(
        "{SettingName} setting was null for model {ModelCardId}, using default: {DefaultValue}",
        settingName,
        modelCard.ModelCardId,
@@ -184,71 +171,59 @@ public class ToSpeckleSettingsManager : IToSpeckleSettingsManager
    return returnValue;
  }

-  private void EvictCacheForModelCard(SenderModelCard modelCard)
+  private void EvictCacheForModelCard(Document document, SenderModelCard modelCard)
  {
-    var doc = _revitContext.UIApplication?.ActiveUIDocument?.Document;
-    if (doc == null)
-    {
-      throw new SpeckleException("Unable to retrieve active UI document");
-    }
-    var objectIds = modelCard.SendFilter != null ? modelCard.SendFilter.NotNull().SelectedObjectIds : [];
-    var unpackedObjectIds = _elementUnpacker.GetUnpackedElementIds(objectIds, doc);
-    _sendConversionCache.EvictObjects(unpackedObjectIds);
+    var objectIds = modelCard.SendFilter?.SelectedObjectIds ?? [];
+    var unpackedObjectIds = elementUnpacker.GetUnpackedElementIds(objectIds, document);
+    sendConversionCache.EvictObjects(unpackedObjectIds);
  }

-  private Transform? GetTransform(ReferencePointType referencePointType)
+  private Transform? GetTransform(Document document, ReferencePointType referencePointType)
  {
    Transform? referencePointTransform = null;

-    if (_revitContext.UIApplication is UIApplication uiApplication)
+    // first get the main doc base points and reference setting transform
+    using FilteredElementCollector filteredElementCollector = new(document);
+    var points = filteredElementCollector.OfClass(typeof(BasePoint)).Cast<BasePoint>().ToList();
+    BasePoint? projectPoint = points.FirstOrDefault(o => !o.IsShared);
+    BasePoint? surveyPoint = points.FirstOrDefault(o => o.IsShared);
+
+    switch (referencePointType)
    {
-      // first get the main doc base points and reference setting transform
-      using FilteredElementCollector filteredElementCollector = new(uiApplication.ActiveUIDocument.Document);
-      var points = filteredElementCollector.OfClass(typeof(BasePoint)).Cast<BasePoint>().ToList();
-      BasePoint? projectPoint = points.FirstOrDefault(o => !o.IsShared);
-      BasePoint? surveyPoint = points.FirstOrDefault(o => o.IsShared);
+      // note that the project base (ui) rotation is registered on the survey pt, not on the base point
+      case ReferencePointType.ProjectBase:
+        if (projectPoint is not null)
+        {
+          referencePointTransform = Transform.CreateTranslation(projectPoint.Position);
+        }
+        else
+        {
+          throw new InvalidOperationException("Couldn't retrieve Project Point from document");
+        }
+        break;

-      switch (referencePointType)
-      {
-        // note that the project base (ui) rotation is registered on the survey pt, not on the base point
-        case ReferencePointType.ProjectBase:
-          if (projectPoint is not null)
-          {
-            referencePointTransform = Transform.CreateTranslation(projectPoint.Position);
-          }
-          else
-          {
-            throw new InvalidOperationException("Couldn't retrieve Project Point from document");
-          }
-          break;
+      // note that the project base (ui) rotation is registered on the survey pt, not on the base point
+      case ReferencePointType.Survey:
+        if (surveyPoint is not null && projectPoint is not null)
+        {
+          // POC: should a null angle resolve to 0?
+          // retrieve the survey point rotation from the project point
+          var angle = projectPoint.get_Parameter(BuiltInParameter.BASEPOINT_ANGLETON_PARAM)?.AsDouble() ?? 0;

-        // note that the project base (ui) rotation is registered on the survey pt, not on the base point
-        case ReferencePointType.Survey:
-          if (surveyPoint is not null && projectPoint is not null)
-          {
-            // POC: should a null angle resolve to 0?
-            // retrieve the survey point rotation from the project point
-            var angle = projectPoint.get_Parameter(BuiltInParameter.BASEPOINT_ANGLETON_PARAM)?.AsDouble() ?? 0;
+          // POC: following disposed incorrectly or early or maybe a false negative?
+          using Transform translation = Transform.CreateTranslation(surveyPoint.Position);
+          referencePointTransform = translation.Multiply(Transform.CreateRotation(XYZ.BasisZ, angle));
+        }
+        else
+        {
+          throw new InvalidOperationException("Couldn't retrieve Survey and Project Point from document");
+        }
+        break;

-            // POC: following disposed incorrectly or early or maybe a false negative?
-            using Transform translation = Transform.CreateTranslation(surveyPoint.Position);
-            referencePointTransform = translation.Multiply(Transform.CreateRotation(XYZ.BasisZ, angle));
-          }
-          else
-          {
-            throw new InvalidOperationException("Couldn't retrieve Survey and Project Point from document");
-          }
-          break;
-
-        case ReferencePointType.InternalOrigin:
-          break;
-      }
-
-      return referencePointTransform;
+      case ReferencePointType.InternalOrigin:
+        break;
    }

-    throw new InvalidOperationException(
-      "Revit Context UI Application was null when retrieving reference point transform."
-    );
+    return referencePointTransform;
  }
 }
@@ -325,9 +325,9 @@
        "dependencies": {
          "Microsoft.Extensions.DependencyInjection": "[2.2.0, )",
          "Speckle.Connectors.Logging": "[1.0.0, )",
-          "Speckle.Objects": "[3.5.4, )",
-          "Speckle.Sdk": "[3.5.4, )",
-          "Speckle.Sdk.Dependencies": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )",
+          "Speckle.Sdk": "[3.9.0, )",
+          "Speckle.Sdk.Dependencies": "[3.9.0, )"
        }
      },
      "speckle.connectors.logging": {
@@ -337,7 +337,7 @@
        "type": "Project",
        "dependencies": {
          "Microsoft.Extensions.Logging.Abstractions": "[2.2.0, )",
-          "Speckle.Objects": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )"
        }
      },
      "speckle.converters.rhino7": {
@@ -382,18 +382,18 @@
      },
      "Speckle.Objects": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o7ex4+yHJYI8pJbsjNqw+D8r8WjkBoB5aK/GQlGJd/0zydrPxN4SMKS4arpRBR3CUD6JhtQMatScXZOrslGXQg==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "fAOUhScCfDFVVynvipczjyw9RZlOgPOo8aH5A7EDAwZiDuDdd4EsnrqBCSPlmuoPYzY7hsN+5mfRkfw2rB36Ig==",
        "dependencies": {
-          "Speckle.Sdk": "3.5.4"
+          "Speckle.Sdk": "3.9.0"
        }
      },
      "Speckle.Sdk": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o4bEJTz+OBI1koy9xqXSIq3UtUFCKtk6Btg82rdVM2aFMPT3ZoYVarG+ylPcUOHd684XpgGASxE6dIgXz2pvng==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "GtbvnySinrE6Canm6fVjyUOxs4G1bw0aRLs9oPVMdodOKc9TxIQjp1lzVBtr6Jli+nzIxtC86xP5J6r9tufnrQ==",
        "dependencies": {
          "GraphQL.Client": "6.0.0",
          "Microsoft.Bcl.AsyncInterfaces": "5.0.0",
@@ -403,14 +403,14 @@
          "Microsoft.Extensions.Logging": "2.2.0",
          "Speckle.DoubleNumerics": "4.1.0",
          "Speckle.Newtonsoft.Json": "13.0.2",
-          "Speckle.Sdk.Dependencies": "3.5.4"
+          "Speckle.Sdk.Dependencies": "3.9.0"
        }
      },
      "Speckle.Sdk.Dependencies": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "d0ZOHiK11Hq9r7YEkfTvVu33ygWtsrgysIWdCRAz6rdlcAgMCEkWVBoe3jDjxdmUy20TToaQlFKfMH4hTyzWXg=="
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "m/3i+DX/1McN8ig0CcjmHM1BcNmNxgmny/735sKntzzDw23wdo868eOOTrogzmDoYHTyc7J4IjK+GE7iAyWn/g=="
      }
    }
  }
@@ -325,9 +325,9 @@
        "dependencies": {
          "Microsoft.Extensions.DependencyInjection": "[2.2.0, )",
          "Speckle.Connectors.Logging": "[1.0.0, )",
-          "Speckle.Objects": "[3.5.4, )",
-          "Speckle.Sdk": "[3.5.4, )",
-          "Speckle.Sdk.Dependencies": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )",
+          "Speckle.Sdk": "[3.9.0, )",
+          "Speckle.Sdk.Dependencies": "[3.9.0, )"
        }
      },
      "speckle.connectors.logging": {
@@ -337,7 +337,7 @@
        "type": "Project",
        "dependencies": {
          "Microsoft.Extensions.Logging.Abstractions": "[2.2.0, )",
-          "Speckle.Objects": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )"
        }
      },
      "speckle.converters.rhino8": {
@@ -381,18 +381,18 @@
      },
      "Speckle.Objects": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o7ex4+yHJYI8pJbsjNqw+D8r8WjkBoB5aK/GQlGJd/0zydrPxN4SMKS4arpRBR3CUD6JhtQMatScXZOrslGXQg==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "fAOUhScCfDFVVynvipczjyw9RZlOgPOo8aH5A7EDAwZiDuDdd4EsnrqBCSPlmuoPYzY7hsN+5mfRkfw2rB36Ig==",
        "dependencies": {
-          "Speckle.Sdk": "3.5.4"
+          "Speckle.Sdk": "3.9.0"
        }
      },
      "Speckle.Sdk": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o4bEJTz+OBI1koy9xqXSIq3UtUFCKtk6Btg82rdVM2aFMPT3ZoYVarG+ylPcUOHd684XpgGASxE6dIgXz2pvng==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "GtbvnySinrE6Canm6fVjyUOxs4G1bw0aRLs9oPVMdodOKc9TxIQjp1lzVBtr6Jli+nzIxtC86xP5J6r9tufnrQ==",
        "dependencies": {
          "GraphQL.Client": "6.0.0",
          "Microsoft.Bcl.AsyncInterfaces": "5.0.0",
@@ -402,14 +402,14 @@
          "Microsoft.Extensions.Logging": "2.2.0",
          "Speckle.DoubleNumerics": "4.1.0",
          "Speckle.Newtonsoft.Json": "13.0.2",
-          "Speckle.Sdk.Dependencies": "3.5.4"
+          "Speckle.Sdk.Dependencies": "3.9.0"
        }
      },
      "Speckle.Sdk.Dependencies": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "d0ZOHiK11Hq9r7YEkfTvVu33ygWtsrgysIWdCRAz6rdlcAgMCEkWVBoe3jDjxdmUy20TToaQlFKfMH4hTyzWXg=="
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "m/3i+DX/1McN8ig0CcjmHM1BcNmNxgmny/735sKntzzDw23wdo868eOOTrogzmDoYHTyc7J4IjK+GE7iAyWn/g=="
      }
    }
  }
@@ -64,6 +64,13 @@ public class CreateCollection : VariableParameterComponentBase
      }
    }

+    // validate for duplicate application IDs across the entire collection hierarchy
+    if (HasDuplicateApplicationIds(rootCollection))
+    {
+      AddRuntimeMessage(GH_RuntimeMessageLevel.Error, "The same object(s) cannot appear in multiple collections");
+      return; // error already added in validation method
+    }
+
    dataAccess.SetData(0, new SpeckleCollectionWrapperGoo(rootCollection));
  }

@@ -182,6 +189,54 @@ public class CreateCollection : VariableParameterComponentBase
    }
  }

+  /// <summary>
+  /// Validates that all application IDs are unique across the entire collection hierarchy.
+  /// Shows an error if duplicates are found, indicating objects appear in multiple collections.
+  /// </summary>
+  /// <returns>True if duplicates exist, false if all IDs are unique</returns>
+  private bool HasDuplicateApplicationIds(SpeckleCollectionWrapper rootCollection)
+  {
+    // args to CheckForDuplicateApplicationIds passed in since the method can recursively check
+    var seenIds = new HashSet<string>();
+    var duplicateIds = new HashSet<string>();
+
+    // iterate, create hash set and check all application IDs
+    ProcessAndCheckForDuplicateApplicationIds(rootCollection, seenIds, duplicateIds);
+
+    return duplicateIds.Count > 0;
+  }
+
+  /// <summary>
+  /// Recursively collects application IDs from all in the collection hierarchy.
+  /// </summary>
+  /// <remarks>
+  /// Only checks the wrapper's ApplicationId, not for example geometries within DataObjects.
+  /// </remarks>
+  private void ProcessAndCheckForDuplicateApplicationIds(
+    SpeckleCollectionWrapper collection,
+    HashSet<string> seenIds,
+    HashSet<string> duplicateIds
+  )
+  {
+    foreach (var element in collection.Elements)
+    {
+      switch (element)
+      {
+        case SpeckleCollectionWrapper childCollection:
+          // recurse into child collections
+          ProcessAndCheckForDuplicateApplicationIds(childCollection, seenIds, duplicateIds);
+          break;
+
+        case SpeckleWrapper wrapper:
+          if (wrapper.ApplicationId != null && !seenIds.Add(wrapper.ApplicationId))
+          {
+            duplicateIds.Add(wrapper.ApplicationId);
+          }
+          break;
+      }
+    }
+  }
+
  // IGH_VariableParameterComponent implementation
  public override bool CanInsertParameter(GH_ParameterSide side, int index) => side == GH_ParameterSide.Input;

@@ -34,8 +34,7 @@ public class CreateSpeckleProperties : VariableParameterComponentBase
    pManager.AddParameter(param);
  }

-  protected override void RegisterOutputParams(GH_OutputParamManager pManager)
-  {
+  protected override void RegisterOutputParams(GH_OutputParamManager pManager) =>
    pManager.AddParameter(
      new SpecklePropertyGroupParam(),
      "Properties",
@@ -43,7 +42,6 @@ public class CreateSpeckleProperties : VariableParameterComponentBase
      "Properties for Speckle Objects",
      GH_ParamAccess.item
    );
-  }

  protected override void SolveInstance(IGH_DataAccess da)
  {
@@ -67,8 +65,7 @@ public class CreateSpeckleProperties : VariableParameterComponentBase
    {
      var paramName = Params.Input[i].NickName;

-      var data = Params.Input[i].VolatileData.AllData(true).ToList();
-      if (data.Count == 0)
+      if (Params.Input[i].VolatileDataCount == 0)
      {
        continue;
      }
@@ -165,13 +162,12 @@ public class CreateSpeckleProperties : VariableParameterComponentBase
      Params.RegisterInputParam(param);
    }

+    Params.OnParametersChanged();
    ExpireSolution(true);
  }

-  protected override void WriteComponentSpecificData(GH_IWriter writer)
-  {
+  protected override void WriteComponentSpecificData(GH_IWriter writer) =>
    writer.SetBoolean("CreateEmptyProperties", CreateEmptyProperties);
-  }

  protected override void ReadComponentSpecificData(GH_IReader reader)
  {
@@ -89,7 +89,7 @@ public class QuerySpeckleObjects : GH_Component, IGH_VariableParameterComponent
  private List<int>? _outputFilterIndices;

  // Caches the list of all objects by geometrybase type
-  private readonly Dictionary<ObjectType, List<SpeckleGeometryWrapper>> _filterDict = new();
+  private readonly Dictionary<ObjectType, List<SpeckleGeometryWrapper>> _filterDict = [];

  protected override void SolveInstance(IGH_DataAccess dataAccess)
  {
@@ -104,6 +104,9 @@ public class QuerySpeckleObjects : GH_Component, IGH_VariableParameterComponent
    string path = "";
    dataAccess.GetData(1, ref path);

+    // ensure fresh data for type-specific outputs
+    _filterDict.Clear();
+
    // filter by collection path
    // Note: the collection paths selector will omit the target collection from the path of nested collections.
    // the discard ("_objects") will be used to indicate objects found directly in the target collection.
@@ -127,10 +130,7 @@ public class QuerySpeckleObjects : GH_Component, IGH_VariableParameterComponent

    // sort geometry objects by filters
    var geometryObjects = filteredObjects.OfType<SpeckleGeometryWrapper>().ToList();
-    if (_filterDict.Count == 0)
-    {
-      SortObjectsByGeometryBaseType(geometryObjects);
-    }
+    SortObjectsByGeometryBaseType(geometryObjects);

    // Set output objects
    for (int i = 0; i < Params.Output.Count; i++)
@@ -173,13 +173,13 @@ public class QuerySpeckleObjects : GH_Component, IGH_VariableParameterComponent
  {
    if (_filterDict.Count > 0)
    {
-      AddRuntimeMessage(GH_RuntimeMessageLevel.Warning, $"Stored input objects are in an invalid state.");
+      AddRuntimeMessage(GH_RuntimeMessageLevel.Warning, "Stored input objects are in an invalid state");
      return;
    }

    foreach (ObjectType filter in Filters)
    {
-      _filterDict.Add(filter, new());
+      _filterDict.Add(filter, []);
    }

    foreach (var wrapper in objs)
@@ -233,7 +233,7 @@ public class QuerySpeckleObjects : GH_Component, IGH_VariableParameterComponent
    // repopulate current output params if needed
    if (_outputFilterIndices is null)
    {
-      _outputFilterIndices = new();
+      _outputFilterIndices = [];
      foreach (var output in Params.Output)
      {
        if (Enum.TryParse(output.Name, out ObjectType filter))
@@ -289,8 +289,5 @@ public class QuerySpeckleObjects : GH_Component, IGH_VariableParameterComponent
    base.RemovedFromDocument(document);
  }

-  private void OnParameterSourceChanged(object sender, GH_ParamServerEventArgs args) =>
-    // an empty filter dict will trigger the SortObjectsByGeometryBaseType method.
-    // we only want to re-sort objects if an input has changed, not on every trigger of solve instance.
-    _filterDict.Clear();
+  private void OnParameterSourceChanged(object sender, GH_ParamServerEventArgs args) { }
 }
@@ -103,7 +103,7 @@ public class SpeckleDataObjectPassthrough()
    List<SpeckleGeometryWrapperGoo> inputGeometry = new();
    if (!da.GetDataList(1, inputGeometry) && result == null)
    {
-      AddRuntimeMessage(GH_RuntimeMessageLevel.Warning, $"Pass in a Speckle DataObject or Geometries.");
+      AddRuntimeMessage(GH_RuntimeMessageLevel.Warning, "Pass in a Speckle DataObject or Geometries");
      return;
    }

@@ -111,7 +111,7 @@ public class SpeckleDataObjectPassthrough()
    {
      if (inputGeo.Value is SpeckleBlockInstanceWrapper)
      {
-        AddRuntimeMessage(GH_RuntimeMessageLevel.Error, $"DataObjects cannot contain Block Instances.");
+        AddRuntimeMessage(GH_RuntimeMessageLevel.Error, "DataObjects cannot contain Block Instances");
        return;
      }
    }
@@ -158,6 +158,10 @@ public class SpeckleDataObjectPassthrough()
      result.Properties = inputProperties;
    }

+    // generate application ID for new data objects. Unlike SpeckleGeometry, DataObject wrappers aren't created
+    // through casting (which auto-generates IDs), so we must explicitly ensure an ID exists here
+    result.ApplicationId ??= Guid.NewGuid().ToString();
+
    // get the path
    string? path =
      result.Path.Count > 1 ? string.Join(Constants.LAYER_PATH_DELIMITER, result.Path) : result.Path.FirstOrDefault();
@@ -138,7 +138,7 @@ public class SpeckleGeometryPassthrough()

    if (result == null && inputGeometry == null)
    {
-      AddRuntimeMessage(GH_RuntimeMessageLevel.Warning, $"Pass in a Speckle Geometry or Geometry.");
+      AddRuntimeMessage(GH_RuntimeMessageLevel.Warning, "Pass in a Speckle Geometry or Geometry");
      return;
    }

@@ -1,4 +1,5 @@
 using System.Runtime.InteropServices;
+using GH_IO.Serialization;
 using Grasshopper.GUI;
 using Grasshopper.GUI.Canvas;
 using Grasshopper.Kernel;
@@ -46,15 +47,13 @@ public class ReceiveAsyncComponent : GH_AsyncComponent<ReceiveAsyncComponent>
  public bool JustPastedIn { get; set; }
  public string LastVersionDate { get; set; }
  public string LastInfoMessage { get; set; }
-  public HostApp.SpeckleUrlModelResource? UrlModelResource { get; set; }
+  public SpeckleUrlModelResource? UrlModelResource { get; set; }

  // DI props
  public IClient ApiClient { get; private set; }

-  protected override void RegisterInputParams(GH_InputParamManager pManager)
-  {
+  protected override void RegisterInputParams(GH_InputParamManager pManager) =>
    pManager.AddParameter(new SpeckleUrlModelResourceParam(GH_ParamAccess.item));
-  }

  protected override void RegisterOutputParams(GH_OutputParamManager pManager)
  {
@@ -65,6 +64,14 @@ public class ReceiveAsyncComponent : GH_AsyncComponent<ReceiveAsyncComponent>
      "The model collection of the loaded version",
      GH_ParamAccess.item
    );
+
+    pManager.AddParameter(
+      new SpecklePropertyGroupParam(),
+      "Properties",
+      "properties",
+      "Model-wide properties from the root collection",
+      GH_ParamAccess.item
+    );
  }

  protected override void SolveInstance(IGH_DataAccess da)
@@ -284,7 +291,7 @@ public class ReceiveAsyncComponent : GH_AsyncComponent<ReceiveAsyncComponent>
      Account? account = urlResource.Account.GetAccount(scope);
      if (account is null)
      {
-        throw new SpeckleAccountManagerException($"No default account was found");
+        throw new SpeckleAccountManagerException("No default account was found");
      }

      ApiClient?.Dispose();
@@ -297,6 +304,32 @@ public class ReceiveAsyncComponent : GH_AsyncComponent<ReceiveAsyncComponent>
      AddRuntimeMessage(GH_RuntimeMessageLevel.Error, e.ToFormattedString());
    }
  }
+
+  public override bool Write(GH_IWriter writer)
+  {
+    // call base implementation first
+    var result = base.Write(writer);
+
+    // persist AutoReceive setting
+    writer.SetBoolean("AutoReceive", AutoReceive);
+
+    return result;
+  }
+
+  public override bool Read(GH_IReader reader)
+  {
+    // call base implementation first
+    var result = base.Read(reader);
+
+    // restore AutoReceive setting
+    bool autoReceive = false;
+    if (reader.TryGetBoolean("AutoReceive", ref autoReceive))
+    {
+      AutoReceive = autoReceive;
+    }
+
+    return result;
+  }
 }

 public sealed class ReceiveComponentWorker : WorkerInstance<ReceiveAsyncComponent>
@@ -311,6 +344,7 @@ public sealed class ReceiveComponentWorker : WorkerInstance<ReceiveAsyncComponen
  public Base Root { get; set; }
  public SpeckleUrlModelResource? UrlModelResource { get; set; }
  public SpeckleCollectionWrapperGoo Result { get; set; }
+  public SpecklePropertyGroupGoo? RootProperties { get; private set; }
  private List<(GH_RuntimeMessageLevel, string)> RuntimeMessages { get; } = new();

  public override WorkerInstance<ReceiveAsyncComponent> Duplicate(string id, CancellationToken cancellationToken)
@@ -347,6 +381,7 @@ public sealed class ReceiveComponentWorker : WorkerInstance<ReceiveAsyncComponen
    }

    da.SetData(0, Result);
+    da.SetData(1, RootProperties);
  }

  public override async Task DoWork(Action<string, double> reportProgress, Action done)
@@ -419,6 +454,12 @@ public sealed class ReceiveComponentWorker : WorkerInstance<ReceiveAsyncComponen

    CancellationToken.ThrowIfCancellationRequested();

+    SpecklePropertyGroupGoo? rootPropertiesGoo = null;
+    if (Root is RootCollection rootCollection && rootCollection.properties.Count > 0)
+    {
+      rootPropertiesGoo = new SpecklePropertyGroupGoo(rootCollection.properties);
+    }
+
    // Step 2 - CONVERT
    //receiveComponent.Message = $"Unpacking...";
    TraversalContextUnpacker traversalContextUnpacker = new();
@@ -454,6 +495,7 @@ public sealed class ReceiveComponentWorker : WorkerInstance<ReceiveAsyncComponen
    mapHandler.ConvertBlockInstances(blockInstances, unpackedRoot.DefinitionProxies);

    Result = new SpeckleCollectionWrapperGoo(collectionRebuilder.RootCollectionWrapper);
+    RootProperties = rootPropertiesGoo;

    // TODO: If we have NodeRun events later, better to have `ComponentTracker` to use across components
    var customProperties = new Dictionary<string, object>()
@@ -1,5 +1,6 @@
 using Grasshopper.Kernel;
 using Microsoft.Extensions.DependencyInjection;
+using Rhino;
 using Speckle.Connectors.Common;
 using Speckle.Connectors.Common.Analytics;
 using Speckle.Connectors.Common.Operations;
@@ -12,6 +13,7 @@ using Speckle.Connectors.GrasshopperShared.Properties;
 using Speckle.Connectors.GrasshopperShared.Registration;
 using Speckle.Sdk;
 using Speckle.Sdk.Api;
+using Speckle.Sdk.Api.GraphQL.Models;
 using Speckle.Sdk.Credentials;
 using Speckle.Sdk.Models.Collections;

@@ -31,11 +33,21 @@ public class ReceiveComponentInput

 public class ReceiveComponentOutput
 {
-  public SpeckleCollectionWrapperGoo RootObject { get; set; }
+  /// <remarks>
+  /// Made nullable as output can be null when Run = false or on error
+  /// </remarks>
+  public SpeckleCollectionWrapperGoo? RootObject { get; set; }
+  public SpecklePropertyGroupGoo? RootProperties { get; set; }
 }

 public class ReceiveComponent : SpeckleTaskCapableComponent<ReceiveComponentInput, ReceiveComponentOutput>
 {
+  private IClient? _apiClient;
+  private string? _lastVersionId;
+  private SpeckleUrlModelResource? _lastResource;
+  public override Guid ComponentGuid => new("74954F59-B1B7-41FD-97DE-4C6B005F2801");
+  protected override Bitmap Icon => Resources.speckle_operations_syncload;
+
  public ReceiveComponent()
    : base(
      "(Sync) Load",
@@ -45,9 +57,6 @@ public class ReceiveComponent : SpeckleTaskCapableComponent<ReceiveComponentInpu
      ComponentCategories.DEVELOPER
    ) { }

-  public override Guid ComponentGuid => new("74954F59-B1B7-41FD-97DE-4C6B005F2801");
-  protected override Bitmap Icon => Resources.speckle_operations_syncload;
-
  protected override void RegisterInputParams(GH_InputParamManager pManager)
  {
    pManager.AddParameter(new SpeckleUrlModelResourceParam(GH_ParamAccess.item));
@@ -63,6 +72,14 @@ public class ReceiveComponent : SpeckleTaskCapableComponent<ReceiveComponentInpu
      "The model collection of the loaded version",
      GH_ParamAccess.item
    );
+
+    pManager.AddParameter(
+      new SpecklePropertyGroupParam(),
+      "Properties",
+      "properties",
+      "Model-wide properties from the root collection",
+      GH_ParamAccess.item
+    );
  }

  protected override ReceiveComponentInput GetInput(IGH_DataAccess da)
@@ -77,19 +94,30 @@ public class ReceiveComponent : SpeckleTaskCapableComponent<ReceiveComponentInpu
    bool run = false;
    da.GetData(1, ref run);

-    return new(url, run);
+    if (run)
+    {
+      SetupSubscription(url);
+    }
+    else
+    {
+      CleanupSubscription();
+    }
+
+    return new ReceiveComponentInput(url, run);
  }

  protected override void SetOutput(IGH_DataAccess da, ReceiveComponentOutput result)
  {
    if (result.RootObject is null)
    {
-      Message = "Not Loaded";
+      Message = _apiClient != null ? "Monitoring" : "Not Loaded";
    }
    else
    {
      da.SetData(0, result.RootObject);
-      Message = "Done";
+      da.SetData(1, result.RootProperties);
+
+      Message = _apiClient != null ? "Loaded" : "Done";
    }
  }

@@ -107,11 +135,11 @@ public class ReceiveComponent : SpeckleTaskCapableComponent<ReceiveComponentInpu
        GH_RuntimeMessageLevel.Error,
        "Only one model can be loaded at a time. To load to multiple models, please use different load components."
      );
-      return new();
+      return new ReceiveComponentOutput();
    }
    if (!input.Run)
    {
-      return new();
+      return new ReceiveComponentOutput();
    }

    using var scope = PriorityLoader.CreateScopeForActiveDocument();
@@ -123,12 +151,15 @@ public class ReceiveComponent : SpeckleTaskCapableComponent<ReceiveComponentInpu
    Account? account = input.Resource.Account.GetAccount(scope);
    if (account is null)
    {
-      throw new SpeckleAccountManagerException($"No default account was found");
+      throw new SpeckleAccountManagerException("No default account was found");
    }

    using var client = clientFactory.Create(account);
    var receiveInfo = await input.Resource.GetReceiveInfo(client, cancellationToken).ConfigureAwait(false);

+    // store version id for tracking
+    _lastVersionId = receiveInfo.SelectedVersionId;
+
    var progress = new Progress<CardProgress>(_ =>
    {
      // TODO: Progress only makes sense in non-blocking async receive, which is not supported yet.
@@ -139,8 +170,15 @@ public class ReceiveComponent : SpeckleTaskCapableComponent<ReceiveComponentInpu
      .ReceiveCommitObject(receiveInfo, progress, cancellationToken)
      .ConfigureAwait(false);

+    // extract model-wide root properties (see cnx-2722)
+    SpecklePropertyGroupGoo? rootPropertiesGoo = null;
+    if (root is RootCollection rootCollection && rootCollection.properties.Count > 0)
+    {
+      rootPropertiesGoo = new SpecklePropertyGroupGoo(rootCollection.properties);
+    }
+
    // TODO: If we have NodeRun events later, better to have `ComponentTracker` to use across components
-    var customProperties = new Dictionary<string, object>()
+    var customProperties = new Dictionary<string, object>
    {
      { "isAsync", false },
      { "sourceHostApp", HostApplications.GetSlugFromHostAppNameAndVersion(receiveInfo.SourceApplication) }
@@ -193,6 +231,118 @@ public class ReceiveComponent : SpeckleTaskCapableComponent<ReceiveComponentInpu

    // var x = new SpeckleCollectionGoo { Value = collGen.RootCollection };
    var goo = new SpeckleCollectionWrapperGoo(collectionRebuilder.RootCollectionWrapper);
-    return new ReceiveComponentOutput { RootObject = goo };
+    return new ReceiveComponentOutput { RootObject = goo, RootProperties = rootPropertiesGoo };
+  }
+
+  private void SetupSubscription(SpeckleUrlModelResource resource)
+  {
+    // skip if already subscribed to this resource
+    if (_apiClient != null && _lastResource != null && _lastResource.Equals(resource))
+    {
+      return;
+    }
+
+    // only subscribe for Model URLs (not specific versions)
+    if (resource is SpeckleUrlModelVersionResource)
+    {
+      CleanupSubscription();
+      _lastResource = resource;
+      return;
+    }
+
+    try
+    {
+      CleanupSubscription(); // clean up old subscription first
+
+      using var scope = PriorityLoader.CreateScopeForActiveDocument();
+      var account = resource.Account.GetAccount(scope);
+      if (account == null)
+      {
+        return;
+      }
+
+      _apiClient = scope.Get<IClientFactory>().Create(account);
+      _apiClient.Subscription.CreateProjectVersionsUpdatedSubscription(resource.ProjectId).Listeners +=
+        OnVersionCreated;
+
+      _lastResource = resource;
+      Message = "Monitoring";
+    }
+    catch (Exception ex) when (!ex.IsFatal())
+    {
+      AddRuntimeMessage(GH_RuntimeMessageLevel.Warning, $"Could not setup monitoring: {ex.Message}");
+    }
+  }
+
+  private void OnVersionCreated(object? sender, ProjectVersionsUpdatedMessage e) =>
+    // new version detected - trigger reload
+    RhinoApp.InvokeOnUiThread(
+      (Action)
+        delegate
+        {
+          ExpireSolution(true);
+        }
+    );
+
+  private void CleanupSubscription()
+  {
+    if (_apiClient != null && _lastResource != null)
+    {
+      try
+      {
+        _apiClient.Subscription.CreateProjectVersionsUpdatedSubscription(_lastResource.ProjectId).Listeners -=
+          OnVersionCreated;
+      }
+      catch (Exception ex) when (!ex.IsFatal())
+      {
+        // ignore cleanup errors
+      }
+
+      _apiClient.Dispose();
+      _apiClient = null;
+    }
+  }
+
+  // Cleanup on removal
+  public override void RemovedFromDocument(GH_Document document)
+  {
+    CleanupSubscription();
+    base.RemovedFromDocument(document);
+  }
+
+  // Handle document context changes
+  public override void DocumentContextChanged(GH_Document document, GH_DocumentContext context)
+  {
+    if (context == GH_DocumentContext.Unloaded)
+    {
+      CleanupSubscription();
+    }
+    else if (context == GH_DocumentContext.Loaded && _lastResource != null && _apiClient != null)
+    {
+      // Check for version changes when document reopens
+      Task.Run(async () =>
+      {
+        try
+        {
+          var receiveInfo = await _lastResource.GetReceiveInfo(_apiClient);
+          if (receiveInfo.SelectedVersionId != _lastVersionId)
+          {
+            RhinoApp.InvokeOnUiThread(
+              (Action)
+                delegate
+                {
+                  ExpireSolution(true);
+                }
+            );
+          }
+        }
+        catch (Exception ex) when (!ex.IsFatal())
+        {
+          // ignore errors during background check
+        }
+      });
+    }
+
+    base.DocumentContextChanged(document, context);
  }
 }
@@ -51,6 +51,7 @@ public class SendAsyncComponent : GH_AsyncComponent<SendAsyncComponent>
  public IClient ApiClient { get; set; }
  public HostApp.SpeckleUrlModelResource? UrlModelResource { get; set; }
  public SpeckleCollectionWrapperGoo? RootCollectionWrapper { get; set; }
+  public SpecklePropertyGroupGoo? RootProperties { get; private set; }
  public SpeckleUrlModelResource? OutputParam { get; set; }
  public bool HasMultipleInputs { get; set; }

@@ -58,7 +59,10 @@ public class SendAsyncComponent : GH_AsyncComponent<SendAsyncComponent>

  protected override void RegisterInputParams(GH_InputParamManager pManager)
  {
+    // speckle model
    pManager.AddParameter(new SpeckleUrlModelResourceParam());
+
+    // collection
    pManager.AddParameter(
      new SpeckleCollectionParam(GH_ParamAccess.item),
      "Collection",
@@ -68,6 +72,16 @@ public class SendAsyncComponent : GH_AsyncComponent<SendAsyncComponent>
    );
    pManager.AddTextParameter("Version Message", "versionMessage", "The version message", GH_ParamAccess.item);
    pManager[2].Optional = true;
+
+    // model-wide props (see cnx-2722)
+    pManager.AddParameter(
+      new SpecklePropertyGroupParam(),
+      "Properties",
+      "properties",
+      "Optional model-wide properties to attach to the root collection",
+      GH_ParamAccess.item
+    );
+    pManager[3].Optional = true;
  }

  protected override void RegisterOutputParams(GH_OutputParamManager pManager)
@@ -280,6 +294,19 @@ public class SendAsyncComponent : GH_AsyncComponent<SendAsyncComponent>
    string? versionMessage = null;
    da.GetData(2, ref versionMessage);
    VersionMessage = versionMessage;
+
+    SpecklePropertyGroupGoo? rootPropsGoo = null;
+    da.GetData(3, ref rootPropsGoo);
+
+    // validate single properties group
+    // we can't support a list input here, what does that even mean? grafting the collection to each props entry?? scary.
+    if (Params.Input[3].VolatileData.DataCount > 1)
+    {
+      AddRuntimeMessage(GH_RuntimeMessageLevel.Error, "Only one Model Properties group is allowed");
+      return;
+    }
+
+    RootProperties = rootPropsGoo;
  }
 }

@@ -395,6 +422,13 @@ public class SendComponentWorker : WorkerInstance<SendAsyncComponent>
      throw new InvalidOperationException("Root Collection was null");
    }

+    // safe to always create new wrapper since users cannot create SpeckleRootCollectionWrapper directly - it's only
+    // constructed here from the Collection + Model Properties inputs.
+    // if this changes, then we need to update below!
+    var rootWrapper = new SpeckleRootCollectionWrapper(rootCollectionWrapper.Value, Parent.RootProperties?.Unwrap());
+
+    rootCollectionWrapper = new SpeckleRootCollectionWrapperGoo(rootWrapper);
+
    // Step 1 - SEND TO SERVER
    var sendInfo = await urlModelResource.GetSendInfo(Parent.ApiClient, CancellationToken).ConfigureAwait(false);

@@ -408,7 +442,7 @@ public class SendComponentWorker : WorkerInstance<SendAsyncComponent>
    var sendOperation = scope.ServiceProvider.GetRequiredService<SendOperation<SpeckleCollectionWrapperGoo>>();
    SendOperationResult? result = await sendOperation
      .Execute(
-        new List<SpeckleCollectionWrapperGoo>() { rootCollectionWrapper },
+        new List<SpeckleCollectionWrapperGoo> { rootCollectionWrapper },
        sendInfo,
        Parent.VersionMessage,
        progress,
@@ -20,12 +20,19 @@ public class SendComponentInput
  public SpeckleUrlModelResource Resource { get; }
  public SpeckleCollectionWrapperGoo Input { get; }
  public bool Run { get; }
+  public SpecklePropertyGroupGoo? RootProperties { get; }

-  public SendComponentInput(SpeckleUrlModelResource resource, SpeckleCollectionWrapperGoo input, bool run)
+  public SendComponentInput(
+    SpeckleUrlModelResource resource,
+    SpeckleCollectionWrapperGoo input,
+    bool run,
+    SpecklePropertyGroupGoo? rootProperties
+  )
  {
    Resource = resource;
    Input = input;
    Run = run;
+    RootProperties = rootProperties;
  }
 }

@@ -36,6 +43,11 @@ public class SendComponentOutput(SpeckleUrlModelResource? resource)

 public class SendComponent : SpeckleTaskCapableComponent<SendComponentInput, SendComponentOutput>
 {
+  public override Guid ComponentGuid => new("0CF0D173-BDF0-4AC2-9157-02822B90E9FB");
+  public string? Url { get; private set; }
+  public string? VersionMessage { get; private set; }
+  protected override Bitmap Icon => Resources.speckle_operations_syncpublish;
+
  public SendComponent()
    : base(
      "(Sync) Publish",
@@ -45,17 +57,12 @@ public class SendComponent : SpeckleTaskCapableComponent<SendComponentInput, Sen
      ComponentCategories.DEVELOPER
    ) { }

-  public override Guid ComponentGuid => new("0CF0D173-BDF0-4AC2-9157-02822B90E9FB");
-
-  public string? Url { get; private set; }
-
-  public string? VersionMessage { get; private set; }
-
-  protected override Bitmap Icon => Resources.speckle_operations_syncpublish;
-
  protected override void RegisterInputParams(GH_InputParamManager pManager)
  {
+    // speckle model
    pManager.AddParameter(new SpeckleUrlModelResourceParam());
+
+    // collection
    pManager.AddParameter(
      new SpeckleCollectionParam(GH_ParamAccess.item),
      "Collection",
@@ -65,13 +72,22 @@ public class SendComponent : SpeckleTaskCapableComponent<SendComponentInput, Sen
    );
    pManager.AddTextParameter("Version Message", "versionMessage", "The version message", GH_ParamAccess.item);
    pManager[2].Optional = true;
+
+    // model-wide props (see cnx-2722)
+    pManager.AddParameter(
+      new SpecklePropertyGroupParam(),
+      "Properties",
+      "properties",
+      "Optional model-wide properties to attach to the root collection",
+      GH_ParamAccess.item
+    );
+    pManager[3].Optional = true;
+
    pManager.AddBooleanParameter("Run", "r", "Run the publish operation", GH_ParamAccess.item);
  }

-  protected override void RegisterOutputParams(GH_OutputParamManager pManager)
-  {
+  protected override void RegisterOutputParams(GH_OutputParamManager pManager) =>
    pManager.AddParameter(new SpeckleUrlModelResourceParam());
-  }

  protected override SendComponentInput GetInput(IGH_DataAccess da)
  {
@@ -93,10 +109,20 @@ public class SendComponent : SpeckleTaskCapableComponent<SendComponentInput, Sen
    da.GetData(2, ref versionMessage);
    VersionMessage = versionMessage;

-    bool run = false;
-    da.GetData(3, ref run);
+    SpecklePropertyGroupGoo? rootPropsGoo = null;
+    da.GetData(3, ref rootPropsGoo);

-    return new SendComponentInput(resource.NotNull(), rootCollectionWrapper, run);
+    // validate single properties group
+    // we can't support a list input here, what does that even mean? grafting the collection to each props entry?? scary.
+    if (Params.Input[3].VolatileData.DataCount > 1)
+    {
+      throw new SpeckleException("Only one Model Properties group is allowed");
+    }
+
+    bool run = false;
+    da.GetData(4, ref run);
+
+    return new SendComponentInput(resource.NotNull(), rootCollectionWrapper, run, rootPropsGoo);
  }

  protected override void SetOutput(IGH_DataAccess da, SendComponentOutput result)
@@ -121,7 +147,7 @@ public class SendComponent : SpeckleTaskCapableComponent<SendComponentInput, Sen
    {
      Menu_AppendSeparator(menu);

-      Menu_AppendItem(menu, $"View created model online ↗", (s, e) => Open(Url));
+      Menu_AppendItem(menu, "View created model online ↗", (s, e) => Open(Url));
    }

    static void Open(string url)
@@ -166,6 +192,12 @@ public class SendComponent : SpeckleTaskCapableComponent<SendComponentInput, Sen
      return new(null);
    }

+    // safe to always create new wrapper since users cannot create SpeckleRootCollectionWrapper directly - it's only
+    // constructed here from the Collection + Model Properties inputs.
+    // if this changes, then we need to update below!
+    var rootWrapper = new SpeckleRootCollectionWrapper(input.Input.Value, input.RootProperties?.Unwrap());
+    var collectionToSend = new SpeckleRootCollectionWrapperGoo(rootWrapper);
+
    using var scope = PriorityLoader.CreateScopeForActiveDocument();
    var clientFactory = scope.ServiceProvider.GetRequiredService<IClientFactory>();
    var sendOperation = scope.ServiceProvider.GetRequiredService<SendOperation<SpeckleCollectionWrapperGoo>>();
@@ -173,7 +205,7 @@ public class SendComponent : SpeckleTaskCapableComponent<SendComponentInput, Sen
    Account? account = input.Resource.Account.GetAccount(scope);
    if (account is null)
    {
-      throw new SpeckleAccountManagerException($"No default account was found");
+      throw new SpeckleAccountManagerException("No default account was found");
    }

    var progress = new Progress<CardProgress>(_ =>
@@ -186,7 +218,7 @@ public class SendComponent : SpeckleTaskCapableComponent<SendComponentInput, Sen
    var sendInfo = await input.Resource.GetSendInfo(client, cancellationToken).ConfigureAwait(false);
    await sendOperation
      .Execute(
-        new List<SpeckleCollectionWrapperGoo>() { input.Input },
+        new List<SpeckleCollectionWrapperGoo> { collectionToSend },
        sendInfo,
        VersionMessage,
        progress,
@@ -195,7 +227,7 @@ public class SendComponent : SpeckleTaskCapableComponent<SendComponentInput, Sen
      .ConfigureAwait(false);

    // TODO: If we have NodeRun events later, better to have `ComponentTracker` to use across components
-    var customProperties = new Dictionary<string, object>() { { "isAsync", false } };
+    var customProperties = new Dictionary<string, object> { { "isAsync", false } };
    if (sendInfo.WorkspaceId != null)
    {
      customProperties.Add("workspace_id", sendInfo.WorkspaceId);
@@ -87,6 +87,7 @@ public class SpeckleSelectModelComponent : GH_Component
      string? urlInput = null;

      // SCENARIO 1: Component has input wire connected
+
      if (da.GetData(0, ref urlInput))
      {
        UrlInput = urlInput;
@@ -99,6 +100,11 @@ public class SpeckleSelectModelComponent : GH_Component
          return;
        }

+        if (_justPastedIn)
+        {
+          RestoreAccountFromStoredState();
+        }
+
        try
        {
          // NOTE: once we split the logic in Sender and Receiver components, we need to set flag correctly
@@ -132,22 +138,9 @@ public class SpeckleSelectModelComponent : GH_Component
        _storedUserId = SpeckleOperationWizard.SelectedAccount?.id;
      }

-      if (_justPastedIn && _storedUserId != null && !string.IsNullOrEmpty(_storedUserId))
+      if (_justPastedIn)
      {
-        try
-        {
-          SpeckleOperationWizard.SetAccountFromId(_storedUserId);
-        }
-        catch (SpeckleAccountManagerException e)
-        {
-          // Swallow and move onto checking server.
-          Console.WriteLine(e);
-        }
-
-        if (_storedServer != null && SpeckleOperationWizard.SelectedAccount == null)
-        {
-          SpeckleOperationWizard.SetAccountFromIdAndUrl(_storedUserId, _storedServer);
-        }
+        RestoreAccountFromStoredState();
      }

      // Validate backing data
@@ -396,4 +389,39 @@ public class SpeckleSelectModelComponent : GH_Component
    VersionContextMenuButton.ExpirePreview(redraw);
    base.ExpirePreview(redraw);
  }
+
+  /// <summary>
+  /// Restores the account from stored state when the component is pasted or loaded from file.
+  /// </summary>
+  /// <remarks>
+  /// Attempts to restore account in two stages:
+  /// <list type="number">
+  /// <item>First tries to get account by stored user ID</item>
+  /// <item>If that fails and server url is available, falls back to getting any account matching the server</item>
+  /// </list>
+  /// Only executes when <see cref="_justPastedIn"/> is true and <see cref="_storedUserId"/> is not empty.
+  /// </remarks>
+  private void RestoreAccountFromStoredState()
+  {
+    if (_storedUserId is null || string.IsNullOrEmpty(_storedUserId))
+    {
+      return;
+    }
+
+    try
+    {
+      SpeckleOperationWizard.SetAccountFromId(_storedUserId);
+    }
+    catch (SpeckleAccountManagerException e)
+    {
+      Console.WriteLine(e);
+    }
+
+    // Fallback: if account wasn't found by ID but we have a server URL,
+    // try to find any account matching that server
+    if (_storedServer != null && SpeckleOperationWizard.SelectedAccount == null)
+    {
+      SpeckleOperationWizard.SetAccountFromIdAndUrl(_storedUserId, _storedServer);
+    }
+  }
 }
@@ -79,22 +79,40 @@ public class SpeckleOperationWizard
    var resources = SpeckleResourceBuilder.FromUrlString(input, token);
    if (resources.Length == 0)
    {
-      throw new SpeckleException($"Input url string was empty");
+      throw new SpeckleException("Input url string was empty");
    }

    if (resources.Length > 1)
    {
-      throw new SpeckleException($"Input multi-model url is not supported");
+      throw new SpeckleException("Input multi-model url is not supported");
    }

    var resource = resources.First();
    using var scope = PriorityLoader.CreateScopeForActiveDocument();
-    var account = resource.Account.GetAccount(scope);
-    SetAccount(account, false);
+    var urlDerivedAccount = resource.Account.GetAccount(scope);

+    // if no account is selected, happily go through the url derived account approach
    if (SelectedAccount == null)
    {
-      throw new SpeckleException("No account found for server URL");
+      SetAccount(urlDerivedAccount, false);
+    }
+    // if we have an account from right-click context-menu, we rely on that and just validate that it's actually applicable to that server
+    else if (urlDerivedAccount != null && SelectedAccount.serverInfo.url != urlDerivedAccount.serverInfo.url)
+    {
+      throw new SpeckleException(
+        $"Selected account is for '{SelectedAccount.serverInfo.url}' "
+          + $"but URL requires '{urlDerivedAccount.serverInfo.url}'"
+      );
+    }
+
+    // we have both scenarios covered
+    // Scenario #1 - default account from url
+    // Scenario #2 - triggered by account switch on right-click context (and validated)
+    if (SelectedAccount == null)
+    {
+      throw new SpeckleException(
+        $"No appropriate account found for the given '{urlDerivedAccount?.serverInfo.url}' server"
+      );
    }

    IClient client = _clientFactory.Create(SelectedAccount);
@@ -35,9 +35,15 @@ public class GrasshopperRootObjectBuilder : IRootObjectBuilder<SpeckleCollection
    CancellationToken ct = default
  )
  {
-    // deep copy input (to not mutate input) and set the input collection name to "Grasshopper Model"
-    var inputCollectionGoo = (SpeckleCollectionWrapperGoo)input[0].Duplicate();
-    inputCollectionGoo.Value.Name = "Grasshopper Model";
+    // create root collection
+    var rootCollectionGoo = (SpeckleRootCollectionWrapperGoo)input[0].Duplicate();
+    rootCollectionGoo.Value.Name = "Grasshopper Model";
+    RootCollection rootCollection =
+      new(rootCollectionGoo.Value.Name)
+      {
+        applicationId = rootCollectionGoo.Value.ApplicationId,
+        properties = rootCollectionGoo.Value.Properties ?? new()
+      };

    // create packers for colors and render materials
    GrasshopperColorPacker colorPacker = new();
@@ -45,15 +51,15 @@ public class GrasshopperRootObjectBuilder : IRootObjectBuilder<SpeckleCollection
    GrasshopperBlockPacker blockPacker = new(_instanceObjectsManager);

    // unwrap the input collection to remove all wrappers
-    Collection root = Unwrap(inputCollectionGoo.Value, colorPacker, materialPacker, blockPacker);
+    Unwrap(rootCollectionGoo.Value, rootCollection, colorPacker, materialPacker, blockPacker);

    // add proxies
-    root[ProxyKeys.COLOR] = colorPacker.ColorProxies.Values.ToList();
-    root[ProxyKeys.RENDER_MATERIAL] = materialPacker.RenderMaterialProxies.Values.ToList();
-    root[ProxyKeys.INSTANCE_DEFINITION] = blockPacker.InstanceDefinitionProxies.Values.ToList();
+    rootCollection[ProxyKeys.COLOR] = colorPacker.ColorProxies.Values.ToList();
+    rootCollection[ProxyKeys.RENDER_MATERIAL] = materialPacker.RenderMaterialProxies.Values.ToList();
+    rootCollection[ProxyKeys.INSTANCE_DEFINITION] = blockPacker.InstanceDefinitionProxies.Values.ToList();

    // TODO: Not getting any conversion results yet
-    var result = new RootObjectBuilderResult(root, []);
+    var result = new RootObjectBuilderResult(rootCollection, []);

    return Task.FromResult(result);
  }
@@ -62,13 +68,12 @@ public class GrasshopperRootObjectBuilder : IRootObjectBuilder<SpeckleCollection
  // Also packs colors, render materials and block definitions into proxies while unwrapping.
  private Collection Unwrap(
    SpeckleCollectionWrapper wrapper,
+    Collection targetCollection,
    GrasshopperColorPacker colorPacker,
    GrasshopperMaterialPacker materialPacker,
    GrasshopperBlockPacker blockPacker
  )
  {
-    Collection currentColl = wrapper.Collection;
-
    // unpack color, render material and block definitions
    colorPacker.ProcessColor(wrapper.ApplicationId, wrapper.Color);
    materialPacker.ProcessMaterial(wrapper.ApplicationId, wrapper.Material);
@@ -84,20 +89,20 @@ public class GrasshopperRootObjectBuilder : IRootObjectBuilder<SpeckleCollection
          collWrapper.ApplicationId ??= collWrapper.GetSpeckleApplicationId();

          // add to collection and continue unwrap
-          currentColl.elements.Add(collWrapper.Collection);
-          Unwrap(collWrapper, colorPacker, materialPacker, blockPacker);
+          targetCollection.elements.Add(collWrapper.Collection);
+          Unwrap(collWrapper, collWrapper.Collection, colorPacker, materialPacker, blockPacker);
          break;

        case SpeckleGeometryWrapper so: // handles both SpeckleObjectWrapper and SpeckleBlockInstanceWrapper (inheritance)
          // convert wrapper to base and add to collection - common for all object wrappers
          Base objectBase = UnwrapGeometry(so);
          string applicationId = objectBase.applicationId!;
-          currentColl.elements.Add(objectBase);
+          targetCollection.elements.Add(objectBase);

          // do block instance specific stuff (if this object wrapper is actually a block instance)
          if (so is SpeckleBlockInstanceWrapper blockInstance)
          {
-            ProcessBlockInstanceDefinition(blockInstance, colorPacker, materialPacker, blockPacker, currentColl);
+            ProcessBlockInstanceDefinition(blockInstance, colorPacker, materialPacker, blockPacker, targetCollection);
          }

          // process color and material for all object wrappers (including block instances)
@@ -110,7 +115,7 @@ public class GrasshopperRootObjectBuilder : IRootObjectBuilder<SpeckleCollection
          // UnwrapDataObject will unwrap underlying geometry and handle color and material
          // arguably doing too much, but I'm apprehensive looping twice without good reason
          DataObject dataObject = UnwrapDataObject(dataObjectWrapper, colorPacker, materialPacker);
-          currentColl.elements.Add(dataObject);
+          targetCollection.elements.Add(dataObject);
          break;
      }
    }
@@ -127,7 +132,7 @@ public class GrasshopperRootObjectBuilder : IRootObjectBuilder<SpeckleCollection
    }
    */

-    return currentColl;
+    return targetCollection;
  }

  /// <summary>
@@ -11,6 +11,7 @@ namespace Speckle.Connectors.GrasshopperShared.Parameters;
 /// </summary>
 public class SpeckleOutputParam : Param_GenericObject
 {
+  public override GH_Exposure Exposure => GH_Exposure.hidden;
  public override Guid ComponentGuid => new("D2B4713D-FE8B-4EF0-8445-B6096DB15B24");

  public override void AppendAdditionalMenuItems(ToolStripDropDown menu)
@@ -52,6 +52,7 @@ public class SpeckleVariableParam : Param_GenericObject
    }
  }

+  public override GH_Exposure Exposure => GH_Exposure.hidden;
  public override Guid ComponentGuid => new("A1B2C3D4-E5F6-7890-ABCD-123456789ABC");

  public override void AppendAdditionalMenuItems(ToolStripDropDown menu)
@@ -4,6 +4,7 @@ using Rhino;
 using Rhino.Display;
 using Rhino.DocObjects;
 using Rhino.Geometry;
+using Speckle.Connectors.GrasshopperShared.HostApp;
 using Speckle.Sdk.Models;

 namespace Speckle.Connectors.GrasshopperShared.Parameters;
@@ -27,7 +28,25 @@ public class SpeckleGeometryWrapper : SpeckleWrapper, ISpeckleCollectionObject
  // The list of layer/collection names that forms the full path to this object
  public List<string> Path { get; set; } = new();
  public SpeckleCollectionWrapper? Parent { get; set; }
-  public SpecklePropertyGroupGoo Properties { get; set; } = new();
+
+  /// <summary>
+  /// Properties that stay synchronized with Base["properties"]
+  /// </summary>
+  public SpecklePropertyGroupGoo Properties
+  {
+    get
+    {
+      // always create from Base["properties"] like SpeckleDataObjectWrapper does
+      if (Base[Constants.PROPERTIES_PROP] is Dictionary<string, object?> baseProps)
+      {
+        return new SpecklePropertyGroupGoo(baseProps);
+      }
+      return new SpecklePropertyGroupGoo(); // return empty if no properties
+    }
+    set =>
+      // unwrap and store in Base["properties"] like SpeckleDataObjectWrapper does
+      Base[Constants.PROPERTIES_PROP] = value.Unwrap();
+  }

  /// <summary>
  /// The color of the <see cref="Base"/>
@@ -0,0 +1,42 @@
+using System.Diagnostics.CodeAnalysis;
+
+namespace Speckle.Connectors.GrasshopperShared.Parameters;
+
+public class SpeckleRootCollectionWrapper : SpeckleCollectionWrapper
+{
+  public Dictionary<string, object?>? Properties { get; set; }
+
+  public SpeckleRootCollectionWrapper() { }
+
+  [SetsRequiredMembers]
+  public SpeckleRootCollectionWrapper(SpeckleCollectionWrapper wrapper, Dictionary<string, object?>? properties = null)
+  {
+    Base = wrapper.Base;
+    Color = wrapper.Color;
+    Material = wrapper.Material;
+    ApplicationId = wrapper.ApplicationId;
+    Name = wrapper.Name;
+    Path = wrapper.Path;
+    Topology = wrapper.Topology;
+    Elements = wrapper.Elements;
+    Properties = properties;
+  }
+
+  public new SpeckleRootCollectionWrapper DeepCopy()
+  {
+    // delegate most to SpeckleCollectionWrapper and we just copy result
+    SpeckleCollectionWrapper baseCopy = base.DeepCopy();
+    return new SpeckleRootCollectionWrapper
+    {
+      Base = baseCopy.Base,
+      Color = baseCopy.Color,
+      Material = baseCopy.Material,
+      ApplicationId = baseCopy.ApplicationId,
+      Name = baseCopy.Name,
+      Path = baseCopy.Path,
+      Topology = baseCopy.Topology,
+      Elements = baseCopy.Elements,
+      Properties = Properties != null ? new Dictionary<string, object?>(Properties) : null
+    };
+  }
+}
@@ -0,0 +1,20 @@
+using Grasshopper.Kernel.Types;
+
+namespace Speckle.Connectors.GrasshopperShared.Parameters;
+
+public class SpeckleRootCollectionWrapperGoo : SpeckleCollectionWrapperGoo
+{
+  public new SpeckleRootCollectionWrapper Value { get; set; }
+
+  public SpeckleRootCollectionWrapperGoo() { }
+
+  public SpeckleRootCollectionWrapperGoo(SpeckleRootCollectionWrapper value)
+    : base(value)
+  {
+    Value = value;
+  }
+
+  public override IGH_Goo Duplicate() => new SpeckleRootCollectionWrapperGoo(Value.DeepCopy());
+
+  public override string ToString() => Value?.ToString() ?? "Invalid Root Collection";
+}
@@ -90,6 +90,8 @@
    <Compile Include="$(MSBuildThisFileDirectory)Parameters\Wrappers\SpeckleDataObjectWrapperParam.cs" />
    <Compile Include="$(MSBuildThisFileDirectory)Parameters\Wrappers\SpeckleMaterialWrapperGoo.cs" />
    <Compile Include="$(MSBuildThisFileDirectory)Parameters\Wrappers\SpeckleMaterialWrapperParam.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Parameters\Wrappers\SpeckleRootCollectionWrapper.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Parameters\Wrappers\SpeckleRootCollectionWrapperGoo.cs" />
    <Compile Include="$(MSBuildThisFileDirectory)Parameters\Wrappers\SpeckleWrapper.cs" />
    <Compile Include="$(MSBuildThisFileDirectory)Parameters\Wrappers\SpeckleMaterialWrapperGoo.ModelObjects.cs" />
    <Compile Include="$(MSBuildThisFileDirectory)Parameters\Wrappers\SpeckleMaterialWrapper.cs" />
@@ -306,9 +306,9 @@
        "dependencies": {
          "Microsoft.Extensions.DependencyInjection": "[2.2.0, )",
          "Speckle.Connectors.Logging": "[1.0.0, )",
-          "Speckle.Objects": "[3.5.4, )",
-          "Speckle.Sdk": "[3.5.4, )",
-          "Speckle.Sdk.Dependencies": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )",
+          "Speckle.Sdk": "[3.9.0, )",
+          "Speckle.Sdk.Dependencies": "[3.9.0, )"
        }
      },
      "speckle.connectors.dui": {
@@ -341,7 +341,7 @@
        "type": "Project",
        "dependencies": {
          "Microsoft.Extensions.Logging.Abstractions": "[2.2.0, )",
-          "Speckle.Objects": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )"
        }
      },
      "speckle.converters.rhino7": {
@@ -401,18 +401,18 @@
      },
      "Speckle.Objects": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o7ex4+yHJYI8pJbsjNqw+D8r8WjkBoB5aK/GQlGJd/0zydrPxN4SMKS4arpRBR3CUD6JhtQMatScXZOrslGXQg==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "fAOUhScCfDFVVynvipczjyw9RZlOgPOo8aH5A7EDAwZiDuDdd4EsnrqBCSPlmuoPYzY7hsN+5mfRkfw2rB36Ig==",
        "dependencies": {
-          "Speckle.Sdk": "3.5.4"
+          "Speckle.Sdk": "3.9.0"
        }
      },
      "Speckle.Sdk": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o4bEJTz+OBI1koy9xqXSIq3UtUFCKtk6Btg82rdVM2aFMPT3ZoYVarG+ylPcUOHd684XpgGASxE6dIgXz2pvng==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "GtbvnySinrE6Canm6fVjyUOxs4G1bw0aRLs9oPVMdodOKc9TxIQjp1lzVBtr6Jli+nzIxtC86xP5J6r9tufnrQ==",
        "dependencies": {
          "GraphQL.Client": "6.0.0",
          "Microsoft.Bcl.AsyncInterfaces": "5.0.0",
@@ -422,14 +422,14 @@
          "Microsoft.Extensions.Logging": "2.2.0",
          "Speckle.DoubleNumerics": "4.1.0",
          "Speckle.Newtonsoft.Json": "13.0.2",
-          "Speckle.Sdk.Dependencies": "3.5.4"
+          "Speckle.Sdk.Dependencies": "3.9.0"
        }
      },
      "Speckle.Sdk.Dependencies": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "d0ZOHiK11Hq9r7YEkfTvVu33ygWtsrgysIWdCRAz6rdlcAgMCEkWVBoe3jDjxdmUy20TToaQlFKfMH4hTyzWXg=="
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "m/3i+DX/1McN8ig0CcjmHM1BcNmNxgmny/735sKntzzDw23wdo868eOOTrogzmDoYHTyc7J4IjK+GE7iAyWn/g=="
      },
      "System.Resources.Extensions": {
        "type": "CentralTransitive",
@@ -306,9 +306,9 @@
        "dependencies": {
          "Microsoft.Extensions.DependencyInjection": "[2.2.0, )",
          "Speckle.Connectors.Logging": "[1.0.0, )",
-          "Speckle.Objects": "[3.5.4, )",
-          "Speckle.Sdk": "[3.5.4, )",
-          "Speckle.Sdk.Dependencies": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )",
+          "Speckle.Sdk": "[3.9.0, )",
+          "Speckle.Sdk.Dependencies": "[3.9.0, )"
        }
      },
      "speckle.connectors.dui": {
@@ -341,7 +341,7 @@
        "type": "Project",
        "dependencies": {
          "Microsoft.Extensions.Logging.Abstractions": "[2.2.0, )",
-          "Speckle.Objects": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )"
        }
      },
      "speckle.converters.rhino8": {
@@ -400,18 +400,18 @@
      },
      "Speckle.Objects": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o7ex4+yHJYI8pJbsjNqw+D8r8WjkBoB5aK/GQlGJd/0zydrPxN4SMKS4arpRBR3CUD6JhtQMatScXZOrslGXQg==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "fAOUhScCfDFVVynvipczjyw9RZlOgPOo8aH5A7EDAwZiDuDdd4EsnrqBCSPlmuoPYzY7hsN+5mfRkfw2rB36Ig==",
        "dependencies": {
-          "Speckle.Sdk": "3.5.4"
+          "Speckle.Sdk": "3.9.0"
        }
      },
      "Speckle.Sdk": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o4bEJTz+OBI1koy9xqXSIq3UtUFCKtk6Btg82rdVM2aFMPT3ZoYVarG+ylPcUOHd684XpgGASxE6dIgXz2pvng==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "GtbvnySinrE6Canm6fVjyUOxs4G1bw0aRLs9oPVMdodOKc9TxIQjp1lzVBtr6Jli+nzIxtC86xP5J6r9tufnrQ==",
        "dependencies": {
          "GraphQL.Client": "6.0.0",
          "Microsoft.Bcl.AsyncInterfaces": "5.0.0",
@@ -421,14 +421,14 @@
          "Microsoft.Extensions.Logging": "2.2.0",
          "Speckle.DoubleNumerics": "4.1.0",
          "Speckle.Newtonsoft.Json": "13.0.2",
-          "Speckle.Sdk.Dependencies": "3.5.4"
+          "Speckle.Sdk.Dependencies": "3.9.0"
        }
      },
      "Speckle.Sdk.Dependencies": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "d0ZOHiK11Hq9r7YEkfTvVu33ygWtsrgysIWdCRAz6rdlcAgMCEkWVBoe3jDjxdmUy20TToaQlFKfMH4hTyzWXg=="
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "m/3i+DX/1McN8ig0CcjmHM1BcNmNxgmny/735sKntzzDw23wdo868eOOTrogzmDoYHTyc7J4IjK+GE7iAyWn/g=="
      },
      "System.Resources.Extensions": {
        "type": "CentralTransitive",
@@ -235,9 +235,9 @@
        "dependencies": {
          "Microsoft.Extensions.DependencyInjection": "[2.2.0, )",
          "Speckle.Connectors.Logging": "[1.0.0, )",
-          "Speckle.Objects": "[3.5.4, )",
-          "Speckle.Sdk": "[3.5.4, )",
-          "Speckle.Sdk.Dependencies": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )",
+          "Speckle.Sdk": "[3.9.0, )",
+          "Speckle.Sdk.Dependencies": "[3.9.0, )"
        }
      },
      "speckle.connectors.dui": {
@@ -261,7 +261,7 @@
        "type": "Project",
        "dependencies": {
          "Microsoft.Extensions.Logging.Abstractions": "[2.2.0, )",
-          "Speckle.Objects": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )"
        }
      },
      "speckle.converters.rhino8": {
@@ -311,18 +311,18 @@
      },
      "Speckle.Objects": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o7ex4+yHJYI8pJbsjNqw+D8r8WjkBoB5aK/GQlGJd/0zydrPxN4SMKS4arpRBR3CUD6JhtQMatScXZOrslGXQg==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "fAOUhScCfDFVVynvipczjyw9RZlOgPOo8aH5A7EDAwZiDuDdd4EsnrqBCSPlmuoPYzY7hsN+5mfRkfw2rB36Ig==",
        "dependencies": {
-          "Speckle.Sdk": "3.5.4"
+          "Speckle.Sdk": "3.9.0"
        }
      },
      "Speckle.Sdk": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o4bEJTz+OBI1koy9xqXSIq3UtUFCKtk6Btg82rdVM2aFMPT3ZoYVarG+ylPcUOHd684XpgGASxE6dIgXz2pvng==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "GtbvnySinrE6Canm6fVjyUOxs4G1bw0aRLs9oPVMdodOKc9TxIQjp1lzVBtr6Jli+nzIxtC86xP5J6r9tufnrQ==",
        "dependencies": {
          "GraphQL.Client": "6.0.0",
          "Microsoft.Data.Sqlite": "7.0.5",
@@ -330,14 +330,14 @@
          "Microsoft.Extensions.Logging": "2.2.0",
          "Speckle.DoubleNumerics": "4.1.0",
          "Speckle.Newtonsoft.Json": "13.0.2",
-          "Speckle.Sdk.Dependencies": "3.5.4"
+          "Speckle.Sdk.Dependencies": "3.9.0"
        }
      },
      "Speckle.Sdk.Dependencies": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "d0ZOHiK11Hq9r7YEkfTvVu33ygWtsrgysIWdCRAz6rdlcAgMCEkWVBoe3jDjxdmUy20TToaQlFKfMH4hTyzWXg=="
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "m/3i+DX/1McN8ig0CcjmHM1BcNmNxgmny/735sKntzzDw23wdo868eOOTrogzmDoYHTyc7J4IjK+GE7iAyWn/g=="
      }
    },
    "net8.0-windows7.0/win-x64": {
@@ -83,7 +83,7 @@ public sealed class RhinoSendBinding : ISendBinding
    _sendOperationManagerFactory = sendOperationManagerFactory;
    _rhinoLayerHelper = rhinoLayerHelper;
    Commands = new SendBindingUICommands(parent); // POC: Commands are tightly coupled with their bindings, at least for now, saves us injecting a factory.
-    PreviousUnitSystem = RhinoDoc.ActiveDoc.ModelUnitSystem;
+    PreviousUnitSystem = RhinoDoc.ActiveDoc?.ModelUnitSystem ?? UnitSystem.None;
    SubscribeToRhinoEvents();
  }

@@ -104,10 +104,10 @@ public class RhinoInstanceBaker : IInstanceBaker<IReadOnlyCollection<string>>
            attributes
          );

-          // POC: check on defIndex -1, means we haven't created anything - this is most likely an recoverable error at this stage
+          // POC: check on defIndex -1, means we haven't created anything - this is most likely an unrecoverable error at this stage
          if (defIndex == -1)
          {
-            throw new ConversionException("Failed to create an instance defintion object.");
+            throw new ConversionException("Failed to create an instance definition object.");
          }

          if (definitionProxy.applicationId != null)
@@ -170,9 +170,13 @@ public class RhinoInstanceBaker : IInstanceBaker<IReadOnlyCollection<string>>
  public void PurgeInstances(string namePrefix)
  {
    var currentDoc = RhinoDoc.ActiveDoc; // POC: too much right now to interface around
+
+    // clean name prefix to match how block names are created
+    var cleanedPrefix = RhinoUtils.CleanBlockDefinitionName(namePrefix);
+
    foreach (var definition in currentDoc.InstanceDefinitions)
    {
-      if (!definition.IsDeleted && definition.Name.Contains(namePrefix))
+      if (!definition.IsDeleted && definition.Name.Contains(cleanedPrefix))
      {
        currentDoc.InstanceDefinitions.Delete(definition.Index, true, false);
      }
@@ -1,5 +1,4 @@
 using Microsoft.Extensions.Logging;
-using Rhino;
 using Speckle.Converters.Common;
 using Speckle.Converters.Rhino;
 using Speckle.Objects.Other;
@@ -44,35 +43,43 @@ public class RhinoMaterialBaker
        string materialId = speckleRenderMaterial.applicationId ?? speckleRenderMaterial.id.NotNull();
        string matName = $"{speckleRenderMaterial.name}-({materialId})-{baseLayerName}";
        matName = matName.Replace("[", "").Replace("]", ""); // "Material" doesn't like square brackets if we create from here. Once they created from Rhino UI, all good..
-        Color diffuse = Color.FromArgb(speckleRenderMaterial.diffuse);
-        Color emissive = Color.FromArgb(speckleRenderMaterial.emissive);
-        double transparency = 1 - speckleRenderMaterial.opacity;

-        Material rhinoMaterial =
-          new()
-          {
-            Name = matName,
-            DiffuseColor = diffuse,
-            EmissionColor = emissive,
-            Transparency = transparency
-          };
+        // Check if material with this name already exists in the document
+        int matIndex = doc.Materials.Find(matName, ignoreDeletedMaterials: true);

-        // try to get additional properties
-        if (speckleRenderMaterial["ior"] is double ior)
-        {
-          rhinoMaterial.IndexOfRefraction = ior;
-        }
-        if (speckleRenderMaterial["shine"] is double shine)
-        {
-          rhinoMaterial.Shine = shine;
-        }
-
-        int matIndex = doc.Materials.Add(rhinoMaterial);
-
-        // POC: check on matIndex -1, means we haven't created anything - this is most likely an recoverable error at this stage
+        // If material doesn't exist, create it
        if (matIndex == -1)
        {
-          throw new ConversionException("Failed to add a material to the document.");
+          Color diffuse = Color.FromArgb(speckleRenderMaterial.diffuse);
+          Color emissive = Color.FromArgb(speckleRenderMaterial.emissive);
+          double transparency = 1 - speckleRenderMaterial.opacity;
+
+          Material rhinoMaterial =
+            new()
+            {
+              Name = matName,
+              DiffuseColor = diffuse,
+              EmissionColor = emissive,
+              Transparency = transparency
+            };
+
+          // try to get additional properties
+          if (speckleRenderMaterial["ior"] is double ior)
+          {
+            rhinoMaterial.IndexOfRefraction = ior;
+          }
+          if (speckleRenderMaterial["shine"] is double shine)
+          {
+            rhinoMaterial.Shine = shine;
+          }
+
+          matIndex = doc.Materials.Add(rhinoMaterial);
+
+          // POC: check on matIndex -1, means we haven't created anything - this is most likely an recoverable error at this stage
+          if (matIndex == -1)
+          {
+            throw new ConversionException($"Failed to add a material to the document: '{matName}' (ID: {materialId})");
+          }
        }

        // Create the object <> material index map
@@ -87,27 +94,4 @@ public class RhinoMaterialBaker
      }
    }
  }
-
-  /// <summary>
-  /// Removes all materials with a name starting with <paramref name="namePrefix"/> from the active document
-  /// </summary>
-  /// <param name="namePrefix"></param>
-  public void PurgeMaterials(string namePrefix)
-  {
-    var currentDoc = RhinoDoc.ActiveDoc; // POC: too much right now to interface around
-    foreach (Material material in currentDoc.Materials)
-    {
-      try
-      {
-        if (!material.IsDeleted && material.Name != null && material.Name.Contains(namePrefix))
-        {
-          currentDoc.Materials.Delete(material);
-        }
-      }
-      catch (Exception ex) when (!ex.IsFatal())
-      {
-        _logger.LogError(ex, "Failed to purge a material from the document");
-      }
-    }
-  }
 }
@@ -218,13 +218,23 @@ public class RhinoMaterialUnpacker
      ? pbRenderMaterial.Material.EmissionColor
      : pbRenderMaterial.Emission.AsSystemColor(); // pbRenderMaterial.emission gives wrong color for emission materials, and material.emissioncolor gives the wrong value for most others *shrug*

+    // NOTE: added after CNX-2661, without having file that caused issue hard to say what the issue is
+    // api bug / funny model (custom textures) / upgrade from old model (e.g. Rhino 6)? who knows.
+    // PBR standard is 0-1. Clamping to valid range. This may indicate texture data is in wrong scale.
+    double roughness = pbRenderMaterial.Roughness;
+    if (roughness < 0 || roughness > 1)
+    {
+      _logger.LogWarning("Material '{Name}' has invalid roughness value of {Value}", renderMaterial.Name, roughness);
+      roughness = Math.Min(Math.Max(0, roughness), 1); // Math.Clamp() only from C# 8.0
+    }
+
    SpeckleRenderMaterial speckleRenderMaterial =
      new()
      {
        name = renderMaterialName,
        opacity = opacity,
        metalness = pbRenderMaterial.Metallic,
-        roughness = pbRenderMaterial.Roughness,
+        roughness = roughness,
        diffuse = diffuse.ToArgb(),
        emissive = emissive.ToArgb(),
        applicationId = renderMaterial.Id.ToString()
@@ -256,7 +256,8 @@ public class RhinoHostObjectBuilder : IHostObjectBuilder
      .RunOnMain(() =>
      {
        _instanceBaker.PurgeInstances(baseLayerName);
-        _materialBaker.PurgeMaterials(baseLayerName);
+        // Materials are now reused across receives instead of being purged
+        // _materialBaker.PurgeMaterials(baseLayerName);

        var doc = _converterSettings.Current.Document;
        // Cleans up any previously received objects
@@ -325,9 +325,9 @@
        "dependencies": {
          "Microsoft.Extensions.DependencyInjection": "[2.2.0, )",
          "Speckle.Connectors.Logging": "[1.0.0, )",
-          "Speckle.Objects": "[3.5.4, )",
-          "Speckle.Sdk": "[3.5.4, )",
-          "Speckle.Sdk.Dependencies": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )",
+          "Speckle.Sdk": "[3.9.0, )",
+          "Speckle.Sdk.Dependencies": "[3.9.0, )"
        }
      },
      "speckle.connectors.dui": {
@@ -360,7 +360,7 @@
        "type": "Project",
        "dependencies": {
          "Microsoft.Extensions.Logging.Abstractions": "[2.2.0, )",
-          "Speckle.Objects": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )"
        }
      },
      "LibTessDotNet": {
@@ -410,18 +410,18 @@
      },
      "Speckle.Objects": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o7ex4+yHJYI8pJbsjNqw+D8r8WjkBoB5aK/GQlGJd/0zydrPxN4SMKS4arpRBR3CUD6JhtQMatScXZOrslGXQg==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "fAOUhScCfDFVVynvipczjyw9RZlOgPOo8aH5A7EDAwZiDuDdd4EsnrqBCSPlmuoPYzY7hsN+5mfRkfw2rB36Ig==",
        "dependencies": {
-          "Speckle.Sdk": "3.5.4"
+          "Speckle.Sdk": "3.9.0"
        }
      },
      "Speckle.Sdk": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o4bEJTz+OBI1koy9xqXSIq3UtUFCKtk6Btg82rdVM2aFMPT3ZoYVarG+ylPcUOHd684XpgGASxE6dIgXz2pvng==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "GtbvnySinrE6Canm6fVjyUOxs4G1bw0aRLs9oPVMdodOKc9TxIQjp1lzVBtr6Jli+nzIxtC86xP5J6r9tufnrQ==",
        "dependencies": {
          "GraphQL.Client": "6.0.0",
          "Microsoft.Bcl.AsyncInterfaces": "5.0.0",
@@ -431,14 +431,14 @@
          "Microsoft.Extensions.Logging": "2.2.0",
          "Speckle.DoubleNumerics": "4.1.0",
          "Speckle.Newtonsoft.Json": "13.0.2",
-          "Speckle.Sdk.Dependencies": "3.5.4"
+          "Speckle.Sdk.Dependencies": "3.9.0"
        }
      },
      "Speckle.Sdk.Dependencies": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "d0ZOHiK11Hq9r7YEkfTvVu33ygWtsrgysIWdCRAz6rdlcAgMCEkWVBoe3jDjxdmUy20TToaQlFKfMH4hTyzWXg=="
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "m/3i+DX/1McN8ig0CcjmHM1BcNmNxgmny/735sKntzzDw23wdo868eOOTrogzmDoYHTyc7J4IjK+GE7iAyWn/g=="
      }
    }
  }
@@ -406,9 +406,9 @@
        "dependencies": {
          "Microsoft.Extensions.DependencyInjection": "[2.2.0, )",
          "Speckle.Connectors.Logging": "[1.0.0, )",
-          "Speckle.Objects": "[3.5.4, )",
-          "Speckle.Sdk": "[3.5.4, )",
-          "Speckle.Sdk.Dependencies": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )",
+          "Speckle.Sdk": "[3.9.0, )",
+          "Speckle.Sdk.Dependencies": "[3.9.0, )"
        }
      },
      "speckle.connectors.dui": {
@@ -441,7 +441,7 @@
        "type": "Project",
        "dependencies": {
          "Microsoft.Extensions.Logging.Abstractions": "[2.2.0, )",
-          "Speckle.Objects": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )"
        }
      },
      "LibTessDotNet": {
@@ -491,18 +491,18 @@
      },
      "Speckle.Objects": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o7ex4+yHJYI8pJbsjNqw+D8r8WjkBoB5aK/GQlGJd/0zydrPxN4SMKS4arpRBR3CUD6JhtQMatScXZOrslGXQg==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "fAOUhScCfDFVVynvipczjyw9RZlOgPOo8aH5A7EDAwZiDuDdd4EsnrqBCSPlmuoPYzY7hsN+5mfRkfw2rB36Ig==",
        "dependencies": {
-          "Speckle.Sdk": "3.5.4"
+          "Speckle.Sdk": "3.9.0"
        }
      },
      "Speckle.Sdk": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o4bEJTz+OBI1koy9xqXSIq3UtUFCKtk6Btg82rdVM2aFMPT3ZoYVarG+ylPcUOHd684XpgGASxE6dIgXz2pvng==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "GtbvnySinrE6Canm6fVjyUOxs4G1bw0aRLs9oPVMdodOKc9TxIQjp1lzVBtr6Jli+nzIxtC86xP5J6r9tufnrQ==",
        "dependencies": {
          "GraphQL.Client": "6.0.0",
          "Microsoft.Bcl.AsyncInterfaces": "5.0.0",
@@ -512,14 +512,14 @@
          "Microsoft.Extensions.Logging": "2.2.0",
          "Speckle.DoubleNumerics": "4.1.0",
          "Speckle.Newtonsoft.Json": "13.0.2",
-          "Speckle.Sdk.Dependencies": "3.5.4"
+          "Speckle.Sdk.Dependencies": "3.9.0"
        }
      },
      "Speckle.Sdk.Dependencies": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "d0ZOHiK11Hq9r7YEkfTvVu33ygWtsrgysIWdCRAz6rdlcAgMCEkWVBoe3jDjxdmUy20TToaQlFKfMH4hTyzWXg=="
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "m/3i+DX/1McN8ig0CcjmHM1BcNmNxgmny/735sKntzzDw23wdo868eOOTrogzmDoYHTyc7J4IjK+GE7iAyWn/g=="
      }
    }
  }
@@ -406,9 +406,9 @@
        "dependencies": {
          "Microsoft.Extensions.DependencyInjection": "[2.2.0, )",
          "Speckle.Connectors.Logging": "[1.0.0, )",
-          "Speckle.Objects": "[3.5.4, )",
-          "Speckle.Sdk": "[3.5.4, )",
-          "Speckle.Sdk.Dependencies": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )",
+          "Speckle.Sdk": "[3.9.0, )",
+          "Speckle.Sdk.Dependencies": "[3.9.0, )"
        }
      },
      "speckle.connectors.dui": {
@@ -441,7 +441,7 @@
        "type": "Project",
        "dependencies": {
          "Microsoft.Extensions.Logging.Abstractions": "[2.2.0, )",
-          "Speckle.Objects": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )"
        }
      },
      "LibTessDotNet": {
@@ -491,18 +491,18 @@
      },
      "Speckle.Objects": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o7ex4+yHJYI8pJbsjNqw+D8r8WjkBoB5aK/GQlGJd/0zydrPxN4SMKS4arpRBR3CUD6JhtQMatScXZOrslGXQg==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "fAOUhScCfDFVVynvipczjyw9RZlOgPOo8aH5A7EDAwZiDuDdd4EsnrqBCSPlmuoPYzY7hsN+5mfRkfw2rB36Ig==",
        "dependencies": {
-          "Speckle.Sdk": "3.5.4"
+          "Speckle.Sdk": "3.9.0"
        }
      },
      "Speckle.Sdk": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o4bEJTz+OBI1koy9xqXSIq3UtUFCKtk6Btg82rdVM2aFMPT3ZoYVarG+ylPcUOHd684XpgGASxE6dIgXz2pvng==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "GtbvnySinrE6Canm6fVjyUOxs4G1bw0aRLs9oPVMdodOKc9TxIQjp1lzVBtr6Jli+nzIxtC86xP5J6r9tufnrQ==",
        "dependencies": {
          "GraphQL.Client": "6.0.0",
          "Microsoft.Bcl.AsyncInterfaces": "5.0.0",
@@ -512,14 +512,14 @@
          "Microsoft.Extensions.Logging": "2.2.0",
          "Speckle.DoubleNumerics": "4.1.0",
          "Speckle.Newtonsoft.Json": "13.0.2",
-          "Speckle.Sdk.Dependencies": "3.5.4"
+          "Speckle.Sdk.Dependencies": "3.9.0"
        }
      },
      "Speckle.Sdk.Dependencies": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "d0ZOHiK11Hq9r7YEkfTvVu33ygWtsrgysIWdCRAz6rdlcAgMCEkWVBoe3jDjxdmUy20TToaQlFKfMH4hTyzWXg=="
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "m/3i+DX/1McN8ig0CcjmHM1BcNmNxgmny/735sKntzzDw23wdo868eOOTrogzmDoYHTyc7J4IjK+GE7iAyWn/g=="
      }
    }
  }
@@ -258,7 +258,7 @@
        "type": "Project",
        "dependencies": {
          "Microsoft.Extensions.Logging.Abstractions": "[2.2.0, )",
-          "Speckle.Objects": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )"
        }
      },
      "Microsoft.Extensions.Logging": {
@@ -287,18 +287,18 @@
      },
      "Speckle.Objects": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o7ex4+yHJYI8pJbsjNqw+D8r8WjkBoB5aK/GQlGJd/0zydrPxN4SMKS4arpRBR3CUD6JhtQMatScXZOrslGXQg==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "fAOUhScCfDFVVynvipczjyw9RZlOgPOo8aH5A7EDAwZiDuDdd4EsnrqBCSPlmuoPYzY7hsN+5mfRkfw2rB36Ig==",
        "dependencies": {
-          "Speckle.Sdk": "3.5.4"
+          "Speckle.Sdk": "3.9.0"
        }
      },
      "Speckle.Sdk": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o4bEJTz+OBI1koy9xqXSIq3UtUFCKtk6Btg82rdVM2aFMPT3ZoYVarG+ylPcUOHd684XpgGASxE6dIgXz2pvng==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "GtbvnySinrE6Canm6fVjyUOxs4G1bw0aRLs9oPVMdodOKc9TxIQjp1lzVBtr6Jli+nzIxtC86xP5J6r9tufnrQ==",
        "dependencies": {
          "GraphQL.Client": "6.0.0",
          "Microsoft.Bcl.AsyncInterfaces": "5.0.0",
@@ -308,14 +308,14 @@
          "Microsoft.Extensions.Logging": "2.2.0",
          "Speckle.DoubleNumerics": "4.1.0",
          "Speckle.Newtonsoft.Json": "13.0.2",
-          "Speckle.Sdk.Dependencies": "3.5.4"
+          "Speckle.Sdk.Dependencies": "3.9.0"
        }
      },
      "Speckle.Sdk.Dependencies": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "d0ZOHiK11Hq9r7YEkfTvVu33ygWtsrgysIWdCRAz6rdlcAgMCEkWVBoe3jDjxdmUy20TToaQlFKfMH4hTyzWXg=="
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "m/3i+DX/1McN8ig0CcjmHM1BcNmNxgmny/735sKntzzDw23wdo868eOOTrogzmDoYHTyc7J4IjK+GE7iAyWn/g=="
      }
    }
  }
@@ -258,7 +258,7 @@
        "type": "Project",
        "dependencies": {
          "Microsoft.Extensions.Logging.Abstractions": "[2.2.0, )",
-          "Speckle.Objects": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )"
        }
      },
      "Microsoft.Extensions.Logging": {
@@ -287,18 +287,18 @@
      },
      "Speckle.Objects": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o7ex4+yHJYI8pJbsjNqw+D8r8WjkBoB5aK/GQlGJd/0zydrPxN4SMKS4arpRBR3CUD6JhtQMatScXZOrslGXQg==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "fAOUhScCfDFVVynvipczjyw9RZlOgPOo8aH5A7EDAwZiDuDdd4EsnrqBCSPlmuoPYzY7hsN+5mfRkfw2rB36Ig==",
        "dependencies": {
-          "Speckle.Sdk": "3.5.4"
+          "Speckle.Sdk": "3.9.0"
        }
      },
      "Speckle.Sdk": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o4bEJTz+OBI1koy9xqXSIq3UtUFCKtk6Btg82rdVM2aFMPT3ZoYVarG+ylPcUOHd684XpgGASxE6dIgXz2pvng==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "GtbvnySinrE6Canm6fVjyUOxs4G1bw0aRLs9oPVMdodOKc9TxIQjp1lzVBtr6Jli+nzIxtC86xP5J6r9tufnrQ==",
        "dependencies": {
          "GraphQL.Client": "6.0.0",
          "Microsoft.Bcl.AsyncInterfaces": "5.0.0",
@@ -308,14 +308,14 @@
          "Microsoft.Extensions.Logging": "2.2.0",
          "Speckle.DoubleNumerics": "4.1.0",
          "Speckle.Newtonsoft.Json": "13.0.2",
-          "Speckle.Sdk.Dependencies": "3.5.4"
+          "Speckle.Sdk.Dependencies": "3.9.0"
        }
      },
      "Speckle.Sdk.Dependencies": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "d0ZOHiK11Hq9r7YEkfTvVu33ygWtsrgysIWdCRAz6rdlcAgMCEkWVBoe3jDjxdmUy20TToaQlFKfMH4hTyzWXg=="
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
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      }
    }
  }
@@ -259,9 +259,9 @@
        "dependencies": {
          "Microsoft.Extensions.DependencyInjection": "[2.2.0, )",
          "Speckle.Connectors.Logging": "[1.0.0, )",
-          "Speckle.Objects": "[3.5.4, )",
-          "Speckle.Sdk": "[3.5.4, )",
-          "Speckle.Sdk.Dependencies": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )",
+          "Speckle.Sdk": "[3.9.0, )",
+          "Speckle.Sdk.Dependencies": "[3.9.0, )"
        }
      },
      "speckle.connectors.dui": {
@@ -285,7 +285,7 @@
        "type": "Project",
        "dependencies": {
          "Microsoft.Extensions.Logging.Abstractions": "[2.2.0, )",
-          "Speckle.Objects": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )"
        }
      },
      "Microsoft.Extensions.DependencyInjection": {
@@ -329,18 +329,18 @@
      },
      "Speckle.Objects": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o7ex4+yHJYI8pJbsjNqw+D8r8WjkBoB5aK/GQlGJd/0zydrPxN4SMKS4arpRBR3CUD6JhtQMatScXZOrslGXQg==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "fAOUhScCfDFVVynvipczjyw9RZlOgPOo8aH5A7EDAwZiDuDdd4EsnrqBCSPlmuoPYzY7hsN+5mfRkfw2rB36Ig==",
        "dependencies": {
-          "Speckle.Sdk": "3.5.4"
+          "Speckle.Sdk": "3.9.0"
        }
      },
      "Speckle.Sdk": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o4bEJTz+OBI1koy9xqXSIq3UtUFCKtk6Btg82rdVM2aFMPT3ZoYVarG+ylPcUOHd684XpgGASxE6dIgXz2pvng==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "GtbvnySinrE6Canm6fVjyUOxs4G1bw0aRLs9oPVMdodOKc9TxIQjp1lzVBtr6Jli+nzIxtC86xP5J6r9tufnrQ==",
        "dependencies": {
          "GraphQL.Client": "6.0.0",
          "Microsoft.Bcl.AsyncInterfaces": "5.0.0",
@@ -350,14 +350,14 @@
          "Microsoft.Extensions.Logging": "2.2.0",
          "Speckle.DoubleNumerics": "4.1.0",
          "Speckle.Newtonsoft.Json": "13.0.2",
-          "Speckle.Sdk.Dependencies": "3.5.4"
+          "Speckle.Sdk.Dependencies": "3.9.0"
        }
      },
      "Speckle.Sdk.Dependencies": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "d0ZOHiK11Hq9r7YEkfTvVu33ygWtsrgysIWdCRAz6rdlcAgMCEkWVBoe3jDjxdmUy20TToaQlFKfMH4hTyzWXg=="
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "m/3i+DX/1McN8ig0CcjmHM1BcNmNxgmny/735sKntzzDw23wdo868eOOTrogzmDoYHTyc7J4IjK+GE7iAyWn/g=="
      }
    }
  }
@@ -210,9 +210,9 @@
        "dependencies": {
          "Microsoft.Extensions.DependencyInjection": "[2.2.0, )",
          "Speckle.Connectors.Logging": "[1.0.0, )",
-          "Speckle.Objects": "[3.5.4, )",
-          "Speckle.Sdk": "[3.5.4, )",
-          "Speckle.Sdk.Dependencies": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )",
+          "Speckle.Sdk": "[3.9.0, )",
+          "Speckle.Sdk.Dependencies": "[3.9.0, )"
        }
      },
      "speckle.connectors.dui": {
@@ -236,7 +236,7 @@
        "type": "Project",
        "dependencies": {
          "Microsoft.Extensions.Logging.Abstractions": "[2.2.0, )",
-          "Speckle.Objects": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )"
        }
      },
      "Microsoft.Extensions.DependencyInjection": {
@@ -280,18 +280,18 @@
      },
      "Speckle.Objects": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o7ex4+yHJYI8pJbsjNqw+D8r8WjkBoB5aK/GQlGJd/0zydrPxN4SMKS4arpRBR3CUD6JhtQMatScXZOrslGXQg==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "fAOUhScCfDFVVynvipczjyw9RZlOgPOo8aH5A7EDAwZiDuDdd4EsnrqBCSPlmuoPYzY7hsN+5mfRkfw2rB36Ig==",
        "dependencies": {
-          "Speckle.Sdk": "3.5.4"
+          "Speckle.Sdk": "3.9.0"
        }
      },
      "Speckle.Sdk": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o4bEJTz+OBI1koy9xqXSIq3UtUFCKtk6Btg82rdVM2aFMPT3ZoYVarG+ylPcUOHd684XpgGASxE6dIgXz2pvng==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "GtbvnySinrE6Canm6fVjyUOxs4G1bw0aRLs9oPVMdodOKc9TxIQjp1lzVBtr6Jli+nzIxtC86xP5J6r9tufnrQ==",
        "dependencies": {
          "GraphQL.Client": "6.0.0",
          "Microsoft.Data.Sqlite": "7.0.5",
@@ -299,14 +299,14 @@
          "Microsoft.Extensions.Logging": "2.2.0",
          "Speckle.DoubleNumerics": "4.1.0",
          "Speckle.Newtonsoft.Json": "13.0.2",
-          "Speckle.Sdk.Dependencies": "3.5.4"
+          "Speckle.Sdk.Dependencies": "3.9.0"
        }
      },
      "Speckle.Sdk.Dependencies": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "d0ZOHiK11Hq9r7YEkfTvVu33ygWtsrgysIWdCRAz6rdlcAgMCEkWVBoe3jDjxdmUy20TToaQlFKfMH4hTyzWXg=="
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "m/3i+DX/1McN8ig0CcjmHM1BcNmNxgmny/735sKntzzDw23wdo868eOOTrogzmDoYHTyc7J4IjK+GE7iAyWn/g=="
      }
    }
  }
@@ -210,9 +210,9 @@
        "dependencies": {
          "Microsoft.Extensions.DependencyInjection": "[2.2.0, )",
          "Speckle.Connectors.Logging": "[1.0.0, )",
-          "Speckle.Objects": "[3.5.4, )",
-          "Speckle.Sdk": "[3.5.4, )",
-          "Speckle.Sdk.Dependencies": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )",
+          "Speckle.Sdk": "[3.9.0, )",
+          "Speckle.Sdk.Dependencies": "[3.9.0, )"
        }
      },
      "speckle.connectors.dui": {
@@ -236,7 +236,7 @@
        "type": "Project",
        "dependencies": {
          "Microsoft.Extensions.Logging.Abstractions": "[2.2.0, )",
-          "Speckle.Objects": "[3.5.4, )"
+          "Speckle.Objects": "[3.9.0, )"
        }
      },
      "Microsoft.Extensions.DependencyInjection": {
@@ -280,18 +280,18 @@
      },
      "Speckle.Objects": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o7ex4+yHJYI8pJbsjNqw+D8r8WjkBoB5aK/GQlGJd/0zydrPxN4SMKS4arpRBR3CUD6JhtQMatScXZOrslGXQg==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "fAOUhScCfDFVVynvipczjyw9RZlOgPOo8aH5A7EDAwZiDuDdd4EsnrqBCSPlmuoPYzY7hsN+5mfRkfw2rB36Ig==",
        "dependencies": {
-          "Speckle.Sdk": "3.5.4"
+          "Speckle.Sdk": "3.9.0"
        }
      },
      "Speckle.Sdk": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "o4bEJTz+OBI1koy9xqXSIq3UtUFCKtk6Btg82rdVM2aFMPT3ZoYVarG+ylPcUOHd684XpgGASxE6dIgXz2pvng==",
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "GtbvnySinrE6Canm6fVjyUOxs4G1bw0aRLs9oPVMdodOKc9TxIQjp1lzVBtr6Jli+nzIxtC86xP5J6r9tufnrQ==",
        "dependencies": {
          "GraphQL.Client": "6.0.0",
          "Microsoft.Data.Sqlite": "7.0.5",
@@ -299,14 +299,14 @@
          "Microsoft.Extensions.Logging": "2.2.0",
          "Speckle.DoubleNumerics": "4.1.0",
          "Speckle.Newtonsoft.Json": "13.0.2",
-          "Speckle.Sdk.Dependencies": "3.5.4"
+          "Speckle.Sdk.Dependencies": "3.9.0"
        }
      },
      "Speckle.Sdk.Dependencies": {
        "type": "CentralTransitive",
-        "requested": "[3.5.4, )",
-        "resolved": "3.5.4",
-        "contentHash": "d0ZOHiK11Hq9r7YEkfTvVu33ygWtsrgysIWdCRAz6rdlcAgMCEkWVBoe3jDjxdmUy20TToaQlFKfMH4hTyzWXg=="
+        "requested": "[3.9.0, )",
+        "resolved": "3.9.0",
+        "contentHash": "m/3i+DX/1McN8ig0CcjmHM1BcNmNxgmny/735sKntzzDw23wdo868eOOTrogzmDoYHTyc7J4IjK+GE7iAyWn/g=="
      }
    }
  }
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Jonathon Broughton	79a6c42cc7	Improves geometry conversion performance Introduces caching mechanisms for fragment IDs and geometry to avoid redundant processing, significantly enhancing geometry conversion speed. Adds methods to clear caches and retrieve statistics for performance monitoring and memory usage estimation. Handles COM exceptions and invalid operations more gracefully, preventing crashes and improving stability.	2025-11-15 18:03:36 +00:00
Jonathon Broughton	e2318df87a	Adds COM object lifetime management utility Introduces a `ComScope` struct to automatically manage the lifecycle of Navisworks COM objects using RAII principles. This prevents memory leaks caused by unreleased COM objects, addressing a common issue with Navisworks interop.	2025-11-15 18:03:17 +00:00
Jonathon Broughton	78d7814351	Fixes RenderMaterials	2025-11-14 19:11:16 +03:00
Jonathon Broughton	17a320ee53	LFG!!! Matrix4x4 Transposed Adds an application ID to instance references.	2025-11-14 18:33:32 +03:00
Jonathon Broughton	396ef981ee	Fixes geometry processing for instance handling Refactors geometry processing logic to handle instances more efficiently. It now correctly applies transformations for single objects, ensuring accurate placement in the scene. Simplifies processing of transforms where necessary for single objects. Removes redundant logging.	2025-11-14 16:41:58 +03:00
Jonathon Broughton	763c413871	Adds instance geometry support to Navisworks connector Introduces instance geometry handling for more efficient and accurate Navisworks data streams. This includes: - Scoping the `InstanceStoreManager` to each conversion session. - Creating a "Geometry Definitions" collection to store shared geometry. - Adding instance definition proxies to the root collection. Addresses issues with duplicate geometry and improves stream performance.	2025-11-14 14:48:31 +03:00
Jonathon Broughton	57a5b41ec1	Refactors display value extraction Streamlines display value extraction by injecting the geometry converter. This change simplifies the DisplayValueExtractor by removing its dependencies on settings and logging. It now directly uses a GeometryToSpeckleConverter instance, which is passed in, for converting model item geometry.	2025-11-14 14:47:47 +03:00
Jonathon Broughton	8385532b96	Introduces instance store management Adds a service to manage shared geometry and instance definition proxies. This system uses two stores for geometry definitions and their instance proxies, facilitating efficient handling of shared geometry. It provides methods for adding, retrieving, and clearing geometries, ensuring deduplication and optimized memory usage.	2025-11-14 14:47:14 +03:00
Jonathon Broughton	e109515852	Implements geometry instancing for Navisworks Adds geometry instancing to improve performance and reduce data size when converting Navisworks models with shared geometry. It identifies shared geometries based on fragment paths, extracts the base geometry once, and creates instance references with transforms. This reduces data duplication and improves loading times in Speckle. Improves handling of COM array data for fragment ID generation and includes comprehensive logging for debugging instancing issues.	2025-11-14 14:46:54 +03:00
Jonathon Broughton	fdf2425ec6	Adds shared project file for Navisworks converter Introduces a shared project file for the Navisworks converter, promoting code reuse and consistency across different Navisworks converter implementations. This file includes common data extractors, data handlers, helpers, services, and settings, reducing duplication and improving maintainability.	2025-11-14 14:46:28 +03:00
Jonathon Broughton	c067cf6f91	Adds instance store manager for geometry Introduces an instance store manager to handle shared geometry, which includes separate stores for geometry definitions and instance proxies. This change prepares for the implementation of an instancing pattern compatible with .NET Framework. It also registers settings from a factory to resolve conversion settings.	2025-11-14 14:45:49 +03:00
Jonathon Broughton	60e26d85c6	Introduces shared geometry store service Creates a singleton service for deduplicating geometry during conversion. This service stores mesh objects, preventing redundant processing of identical geometries by leveraging application IDs. It uses a dictionary and a hash set to optimize lookup and storage, and includes thread safety mechanisms.	2025-11-13 14:17:50 +03:00
Björn Steinhagen	3876f7d220	feat(grasshopper): add model-wide properties to send/receive (#1162 ) * feat: adds model-wide props * feat: adds receive for model-wide props * chore: cleanup * chore: format * refactor: model properties to properties * refactor: props implement IProperties * chore: bump sdk * fix: add missing optional parameter to Receive2 mock setup in tests * fix: protection against multiple model-wide prop groups * refactor: reference point transfrom to root keys --------- Co-authored-by: Claire Kuang <kuang.claire@gmail.com>	2025-11-12 12:50:00 +03:00
Mucahit Bilal GOKER	d4ee1f2a55	feat(revit): add roomId and spaceId parameters (#1181 ) .NET Build and Publish / build-connectors (push) Has been cancelled Details .NET Build and Publish / deploy-installers (push) Has been cancelled Details * add roomId and spaceId parameters * clean up	2025-11-11 10:30:27 +03:00
Jedd Morgan	4f960cc670	readme tweaks (#1179 )	2025-11-10 13:52:43 +00:00
Jedd Morgan	1f63c1f8b3	Merge pull request #1165 from specklesystems/main chore: Back merge main -> Dev	2025-11-10 13:48:30 +00:00
Jedd Morgan	2ed9ffbca7	Use Openheadless for unit support (#1178 )	2025-11-10 12:53:55 +00:00
Jedd Morgan	d87b862e2b	add readme (#1173 )	2025-11-10 12:49:39 +00:00
Mucahit Bilal GOKER	3ad3ad2f01	feat(rhino): use existing materials when loading (#1177 ) * reuse existing materials * comment out purge material * fix: unnecessary using directives * more details in exception message and remove material purge. --------- Co-authored-by: Björn Steinhagen <88777268+bjoernsteinhagen@users.noreply.github.com>	2025-11-10 15:43:04 +03:00
Björn Steinhagen	6db7e46401	fix(grasshopper): refresh parameter UI when toggling empty properties mode (#1174 )	2025-11-10 15:07:57 +03:00
Björn Steinhagen	13fc24c7c7	fix(rhino): handles null active doc (#1180 )	2025-11-10 14:51:06 +03:00
Jedd Morgan	cf86158b83	Ignore (#1171 )	2025-11-03 12:57:17 +00:00
Björn Steinhagen	25eb955636	feat(etabs): add volume calculation for frames and shells (#1167 ) * feat: adds frame volume prop * feat: adds shell volume prop * refactor: simplify caching * fix(etabs): use IsInfinity for etabs 21	2025-10-28 17:39:30 +02:00
dependabot[bot]	7862a858ae	chore(deps): bump actions/upload-artifact from 4 to 5 (#1166 ) Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 4 to 5. - [Release notes](https://github.com/actions/upload-artifact/releases) - [Commits](https://github.com/actions/upload-artifact/compare/v4...v5) --- updated-dependencies: - dependency-name: actions/upload-artifact dependency-version: '5' dependency-type: direct:production update-type: version-update:semver-major ... Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>	2025-10-27 18:09:02 +00:00
Jedd Morgan	bc18d3b494	fix(rhino-importer): Use main thread always for document creation (#1161 ) .NET Build and Publish / build-connectors (push) Has been cancelled Details .NET Build and Publish / deploy-installers (push) Has been cancelled Details * Use main thread * format * configure await false * pass args only once	2025-10-27 11:11:56 +00:00
Björn Steinhagen	fd34f22028	fix(grasshopper): applicationId for SpeckleDataObject on creation (#1159 ) * chore: formatting * fix: generate appId on object creation * feat: validate uniqueness of objects within a collection	2025-10-25 20:46:20 +01:00
Jedd Morgan	958c9e5e94	Merge pull request #1158 from specklesystems/main Main -> Dev back merge	2025-10-20 15:42:23 +01:00
Jedd Morgan	7c7260c603	Merge pull request #1157 from specklesystems/dev .NET Build and Publish / build-connectors (push) Has been cancelled Details .NET Build and Publish / deploy-installers (push) Has been cancelled Details Update dev into main	2025-10-20 15:39:33 +01:00
Oğuzhan Koral	bae9e3e0f1	Prevent crashes on unnamed files (#1154 ) Co-authored-by: Björn Steinhagen <88777268+bjoernsteinhagen@users.noreply.github.com> Co-authored-by: Jedd Morgan <45512892+JR-Morgan@users.noreply.github.com>	2025-10-20 17:33:00 +03:00
Oğuzhan Koral	26b0394613	feat(revit): display value proxies (#1140 ) * POC * some fixes * Handle autocad, rhino and sketchup receives * Handle revit receive * Fix transform issues * fix: custom mesh id logic * Hash function * Merge pull request #1142 from specklesystems/jedd/cnx-2657-hashing-the-meshes feat(revit)!: Use Hash function for mesh geometry instance ids * Use v2 style transform * extra comments * experiment1 * correct transform logic and disposal * corrected transform logic * simplify (maybe) the transform combination * refactor(revit): replace tuples with DisplayValueResult record for display values (#1145) * Clear instance proxies per conversion * fix: material assignment on revit receive (#1146) * Fix: enable send caching (#1148) * Enable caching without definition proxy noise * Log element id relationship while creating cache to filter after conversion to attach root * Update RevitRootObjectBuilder.cs * Clear cache on document swap * More clean up * fix(revit): defer material proxy population to prevent duplicate instance mesh IDs (#1155) * fix(revit): defer material proxy population to prevent duplicate instance mesh IDs * chore: formatting * chore: campsite * refactor: throwing on cache error * refactor: move material proxy population into cache singleton * fix: di * fix(rhino): match cleaned block names when purging instance definitions (#1156) * fix(rhino): match cleaned block names when purging instance definitions * refactor: simplification * chore: comments * refactor: use .Contains --------- Co-authored-by: Björn <steinhagen.bjoern@gmail.com> Co-authored-by: Jedd Morgan <45512892+JR-Morgan@users.noreply.github.com> Co-authored-by: Björn Steinhagen <88777268+bjoernsteinhagen@users.noreply.github.com>	2025-10-20 15:26:56 +01:00
Dogukan Karatas	689ef0bcbe	Merge pull request #1149 from specklesystems/dogukan/cnx-2490-receive-property-sets-in-civil-3d feat (civil): receive property sets	2025-10-17 18:09:25 +02:00
Dogukan Karatas	461585b782	adds additional cast	2025-10-17 17:58:01 +02:00
Claire Kuang	ea33f35a7d	removes unnecessary casting on send	2025-10-17 16:57:38 +01:00
Claire Kuang	7427f1a2f3	adds constants and better host object builder methods	2025-10-17 16:08:40 +01:00
Dogukan Karatas	b7984bf97e	add additional cleaning	2025-10-17 15:25:35 +02:00
Dogukan Karatas	9b24a45b6e	property set pruge	2025-10-17 12:50:58 +02:00
Claire Kuang	4ace81a422	Merge branch 'dev' into dogukan/cnx-2490-receive-property-sets-in-civil-3d	2025-10-17 10:02:40 +01:00
Björn Steinhagen	a60790c92c	fix(grasshopper): account selection not respected when url input connected (#1150 ) * fix: account switching on urlInput * chore: good ol' comments * chore: adding server url to exception message	2025-10-17 10:02:12 +01:00
Dogukan Karatas	fd0d00cac3	Merge branch 'dev' into dogukan/cnx-2490-receive-property-sets-in-civil-3d	2025-10-16 18:48:01 +02:00
Dogukan Karatas	498396e611	Merge pull request #1153 from specklesystems/dogukan/build-package-version-bump chore(build): bump Microsoft.Build version	2025-10-16 18:47:18 +02:00
Dogukan Karatas	5444377398	bump version	2025-10-16 18:29:20 +02:00
Dogukan Karatas	9d981f9800	ci check	2025-10-16 17:59:13 +02:00
Dogukan Karatas	14e17fb67d	prefix and purge	2025-10-16 17:52:30 +02:00
Dogukan Karatas	0ffa7685fd	rather cast than convert	2025-10-16 17:16:20 +02:00
Dogukan Karatas	dc7d4671e4	default value simplification	2025-10-16 16:40:37 +02:00
Dogukan Karatas	10cb5cd66f	removed the parser	2025-10-16 16:24:53 +02:00
Jedd Morgan	cb15d9f77a	Merge pull request #1152 from specklesystems/jrm/trigger-ci Remove arcgis from readme	2025-10-16 15:05:53 +01:00
Jedd Morgan	da74faef9b	read me change to trigger ci	2025-10-16 15:02:58 +01:00
Claire Kuang	4368833c7e	Merge branch 'dev' into dogukan/cnx-2490-receive-property-sets-in-civil-3d	2025-10-16 09:56:57 +01:00
Dogukan Karatas	a20df41316	readonly dict	2025-10-15 22:56:50 +02:00
Dogukan Karatas	ccf48dbad1	process property set definitions from root object	2025-10-15 22:42:33 +02:00
Björn Steinhagen	6700aa27bc	fix(revit): handle level extraction for face-based family instances (#1151 ) * fix: get levels for face-based instances * fix: level unpacker	2025-10-15 22:06:01 +02:00
Dogukan Karatas	df525eab63	moved the baker to the connector	2025-10-15 21:25:12 +02:00
Dogukan Karatas	275901626f	created an abstract class	2025-10-15 16:35:19 +02:00
Claire Kuang	fac0dc31b2	Merge branch 'dev' into dogukan/cnx-2490-receive-property-sets-in-civil-3d	2025-10-15 12:48:26 +01:00
Dogukan Karatas	8696eca1f0	use active transaction	2025-10-15 13:12:41 +02:00
Dogukan Karatas	d647c71cf5	baker added	2025-10-15 12:25:01 +02:00
Dogukan Karatas	9b218dd808	Revert "created PropertySetConverter" This reverts commit `112093f914`.	2025-10-15 12:06:04 +02:00
Björn Steinhagen	9f39dc521d	fix(revit): clamp PBR material properties to avoid receive failures (#1147 ) * fix: clamping roughness vaues * chore: extending to other 0 - 1 values	2025-10-14 16:15:52 +02:00
Dogukan Karatas	112093f914	created PropertySetConverter	2025-10-13 14:08:35 +02:00
Oğuzhan Koral	d174597770	Merge pull request #1141 from specklesystems/dev .NET Build and Publish / build-connectors (push) Has been cancelled Details .NET Build and Publish / deploy-installers (push) Has been cancelled Details Update dev into main	2025-10-08 16:06:07 +03:00
Björn Steinhagen	d9289787b7	fix(grasshopper): add auto-load persistence and reactive behavior to sync receive component (#1134 ) * fix: poc `(Sync) Load` component reacting to new versions * fix: persist setting between sessions --------- Co-authored-by: Claire Kuang <kuang.claire@gmail.com>	2025-10-08 12:59:18 +02:00
Björn Steinhagen	77c1c3b511	fix(revit): handle null SelectedObjectIds in view filters on send (#1139 )	2025-10-07 15:19:05 +02:00
Adam Hathcock	5a1c542832	Push doc to callers if possible (#1129 ) * Push doc to callers if possible * use check for active doc earlier. Use doc instead of linked doc * Use passed in current doc instead of getting active doc each time * fmt * Remove extra using	2025-10-07 07:25:36 +00:00
Adam Hathcock	091d7cc897	Stop exceptions we can't do anything about (#1138 )	2025-10-06 17:19:30 +01:00
Adam Hathcock	21f4fb52a8	cache parameters by group and name instead of caching groups and assuming units are all the same (#1128 ) * cache parameters by group and name * fmt	2025-10-06 12:01:04 +01:00
Adam Hathcock	868ca8db66	Key for docs should fallback correctly and load when not found. (#1130 ) * fix for revit 2024 and greater * fallback to path name for 22/23 * adjust comment --------- Co-authored-by: Björn Steinhagen <88777268+bjoernsteinhagen@users.noreply.github.com> Co-authored-by: Mucahit Bilal GOKER <51519350+bimgeek@users.noreply.github.com>	2025-10-06 10:22:19 +01:00
Björn Steinhagen	a9360e5fac	fix(grasshopper): optimize `CreateSpeckleProperties` for large data trees (#1135 ) * perf: remove expensive tree flattening in CreateSpeckleProperties * chore: format	2025-10-04 10:42:01 +01:00
Björn Steinhagen	3414599f72	fix(etabs): units not supported (#1132 ) * fix: etabs units not supported * chore: notes	2025-10-03 15:15:54 +00:00
Björn Steinhagen	84e92aa8a8	fix: prevent internal parameters from appearing in Params/Primitives tab (#1133 )	2025-10-03 09:56:31 +01:00
Jedd Morgan	edd842763f	remove obsolete (#1131 )	2025-10-02 16:44:26 +01:00
Björn Steinhagen	867ee0f928	feat(etabs): adds design data material props (#1111 )	2025-10-02 16:50:39 +02:00
Jedd Morgan	29ee648d7f	Swallow IOEx (#1125 )	2025-10-01 22:38:56 +00:00
Jedd Morgan	5b9c610856	Only call `IsConnected` on Physical connectors (#1127 )	2025-10-01 15:41:48 +00:00
Adam Hathcock	769ddf6407	merge update (#1121 )	2025-10-01 15:37:35 +00:00
Claire Kuang	dd7205f855	fix(rhino): adds area and volume props to breps (#1124 ) * adds area and volume props to breps * removes bbox props and adds area and volume to extrusion and mesh	2025-10-01 14:34:01 +01:00
Mucahit Bilal GOKER	30ee410309	fix(revit): Missing Type Mark parameter added (#1112 ) * type mark fix * fix: format --------- Co-authored-by: Björn Steinhagen <steinhagen.bjoern@gmail.com>	2025-10-01 15:35:15 +03:00
Jedd Morgan	2d0b1a3a24	chore: Remove legacy .NET based IFC importer (#1118 ) * remove IFC source files * re-generate slnx files	2025-10-01 12:06:43 +01:00
Jedd Morgan	2cdf036172	Merge pull request #1123 from specklesystems/installer-test/linux-ci chore(ci): Refactor out nuget publishing from CI, use linux for pr builds	2025-10-01 11:58:37 +01:00
Björn Steinhagen	c14aa28e76	fix(grasshopper): type-specific outputs not refreshing in `QuerySpeckleObjects` component (#1114 ) Co-authored-by: Claire Kuang <kuang.claire@gmail.com>	2025-09-29 16:50:27 +00:00
Björn Steinhagen	0e7d2554f8	fix(grasshopper): sync `SpeckleGeometryWrapper` `Properties` with `Base["properties"]` (#1113 ) Co-authored-by: Claire Kuang <kuang.claire@gmail.com>	2025-09-29 18:45:27 +02:00
Adam Hathcock	cdfc618bab	Avoid a null points collection (#1116 )	2025-09-29 07:55:29 +00:00
Adam Hathcock	1005edb609	feat(Navisworks) Expose send cache options to all (#1115 )	2025-09-26 19:23:44 +02:00
Adam Hathcock	3b4da8de52	check connection before using? (#1109 )	2025-09-25 08:23:08 +01:00