feat(speckleifc): New PR to add speckleifc repo into this one (#437)

* Initial commit

* Repo setup

* first working version

* Optimised mesh conversion

* timers

* first pass

* format

* Format

* deleted old file

* Working grabbing spatial elements, but not all relationships captured

* DFS for spatials, itterator for geometry

* Second pass, manual traversal

* Ok, this is working nicely now

* Cleanup

* Convert render materials

* property set extraction (#2)

* various changes (#4)

* Fix for non-app.speckle.systems servers (#5)

* don't use https for http server urls (#6)

* fix(conversion): Filter only IfcRoot classes (#7)

* Filter only IfcRoot classes

* vscode config

* Feat(prop): Added better property extraction (#8)

* Added better property extraction

* property sets naming

* feat: attach attributes that are on the element type level (#9)

* Added better property extraction

* property sets naming

* Get attributes from element type

* tidy up (#10)

* Add null check (#11)

* ruff (#12)

* Rendermaterials inherit material names instead of type + unique id (#14)

* lock

* ruff check

* pre-commit

* add license files for the speckleifc subpackage

---------

Co-authored-by: Sebastian Witt <sebastian.witt@rwth-aachen.de>
Co-authored-by: Gergő Jedlicska <57442769+gjedlicska@users.noreply.github.com>
Co-authored-by: Gergő Jedlicska <gergo@jedlicska.com>

.vscode/extensions.json

@@ -0,0 +1,6 @@
+{
+    "recommendations": [
+        "ms-python.python",
+        "charliermarsh.ruff"
+    ]
+}

pyproject.toml

@@ -18,6 +18,9 @@ dependencies = [
     "ujson>=5.10.0",
 ]
 
+[project.optional-dependencies]
+speckleifc = ["ifcopenshell>=0.8.2"]
+
 [dependency-groups]
 dev = [
     "commitizen>=4.1.0",
@@ -48,9 +51,12 @@ build-backend = "hatchling.build"
 source = "vcs"
 
 [tool.hatch.build.targets.wheel]
-only-include = ["src"]
+only-include = ["src", "licenses"]
 sources = ["src"]
 
+[tool.hatch.build.targets.sdist]
+include = ["src", "licenses"]
+
 [tool.hatch.version.raw-options]
 local_scheme = "no-local-version"
 

src/speckleifc/__main__.py

@@ -0,0 +1,105 @@
+import json
+import time
+import traceback
+from argparse import ArgumentParser
+from os import getenv
+
+from speckleifc.ifc_geometry_processing import open_ifc
+from speckleifc.importer import ImportJob
+from specklepy.core.api.client import SpeckleClient
+from specklepy.core.api.credentials import Account
+from specklepy.core.api.inputs.version_inputs import CreateVersionInput
+from specklepy.core.api.models.current import Version
+from specklepy.core.api.operations import send
+from specklepy.transports.server import ServerTransport
+
+
+def cmd_line_import() -> None:
+    parser = ArgumentParser(
+        prog="speckleifc",
+        description="imports a file",
+    )
+    parser.add_argument("file_path")
+    parser.add_argument("output_path")
+    parser.add_argument("project_id")
+    parser.add_argument("version_message")
+    parser.add_argument("model_id")
+    # parser.add_argument("model_name")
+    # parser.add_argument("region_name")
+
+    args = parser.parse_args()
+
+    TOKEN = getenv("USER_TOKEN")
+    assert TOKEN is not None
+    SERVER_URL = getenv("SPECKLE_SERVER_URL") or "http://127.0.0.1:3000"
+    account = Account.from_token(TOKEN, SERVER_URL)
+
+    try:
+        version = open_and_convert_file(
+            args.file_path,
+            args.project_id,
+            args.version_message,
+            args.model_id,
+            account,
+        )
+        with open(args.output_path, "w") as f:
+            json.dump({"success": True, "commitId": version.id}, f)
+    except Exception as e:
+        error_msg = f"IFC Importer failed with exception:\n{traceback.format_exc()}"
+        print(error_msg)
+
+        # Write error result
+        with open(args.output_path, "w") as f:
+            json.dump({"success": False, "error": str(e)}, f)
+
+
+def open_and_convert_file(
+    file_path: str,
+    project_id: str,
+    version_message: str | None,
+    model_id: str,
+    account: Account,
+) -> Version:
+    start = time.time()
+    very_start = start
+
+    ifc_file = open_ifc(file_path)
+    import_job = ImportJob(ifc_file)
+    data = import_job.convert()
+
+    print(f"File conversion complete after {(time.time() - start) * 1000}ms")
+
+    start = time.time()
+
+    remote_transport = ServerTransport(project_id, account=account)
+
+    root_id = send(data, transports=[remote_transport], use_default_cache=False)
+    print(f"Sending to speckle complete after: {(time.time() - start) * 1000}ms")
+
+    start = time.time()
+    server_url = account.serverInfo.url
+    assert server_url
+    client = SpeckleClient(host=server_url, use_ssl=server_url.startswith("https"))
+    client.authenticate_with_account(account)
+
+    create_version = CreateVersionInput(
+        object_id=root_id,
+        model_id=model_id,
+        project_id=project_id,
+        message=version_message,
+        source_application="IFC",
+    )
+    version = client.version.create(create_version)
+    end = time.time()
+    print(f"Version committed after: {(end - start) * 1000}ms")
+
+    print(f"Total time (to commit): {(end - very_start) * 1000}ms")
+    del ifc_file
+
+    return version
+
+
+if __name__ == "__main__":
+    start = time.time()
+    cmd_line_import()
+    print(f"Total time (including cleanup): {(time.time() - start) * 1000}ms")

src/speckleifc/converter/data_object_converter.py

@@ -0,0 +1,28 @@
+from typing import cast
+
+from ifcopenshell.entity_instance import entity_instance
+
+from speckleifc.property_extraction import extract_properties
+from specklepy.objects.base import Base
+from specklepy.objects.data_objects import DataObject
+
+
+def data_object_to_speckle(
+    display_value: list[Base],
+    step_element: entity_instance,
+    children: list[Base],
+) -> DataObject:
+    guid = cast(str, step_element.GlobalId)
+    name = cast(str, step_element.Name or guid)
+
+    data_object = DataObject(
+        applicationId=guid,
+        properties=extract_properties(step_element),
+        name=name or guid,
+        displayValue=display_value,
+    )
+
+    data_object["@elements"] = children
+    data_object["ifcType"] = step_element.is_a()
+
+    return data_object

src/speckleifc/converter/geometry_converter.py

@@ -0,0 +1,130 @@
+from collections import defaultdict
+from collections.abc import Sequence
+from typing import cast
+
+from ifcopenshell.ifcopenshell_wrapper import (
+    Triangulation,
+    TriangulationElement,
+    colour,
+    style,
+)
+
+from speckleifc.render_material_proxy_manager import RenderMaterialProxyManager
+from specklepy.objects.base import Base
+from specklepy.objects.geometry import Mesh
+from specklepy.objects.other import RenderMaterial
+
+
+def geometry_to_speckle(
+    shape: TriangulationElement, render_material_manager: RenderMaterialProxyManager
+) -> list[Base]:
+    geometry = cast(Triangulation, shape.geometry)
+    materials = cast(Sequence[style], geometry.materials)
+    MESH_COUNT = max(len(materials), 1)
+
+    material_ids = cast(Sequence[int], geometry.material_ids)
+    faces = cast(Sequence[int], geometry.faces)
+    verts = cast(Sequence[float], geometry.verts)
+    normals = cast(Sequence[float], geometry.normals)
+
+    FACE_COUNT = len(material_ids)
+
+    if len(faces) != FACE_COUNT * 3:
+        # Not really expected, but occasionally some meshes fail to triangulate
+        return []
+
+    mapped_meshes = _pre_alloc_mesh_lists(shape, material_ids, MESH_COUNT)
+    for i, mesh in enumerate(mapped_meshes):
+        material = _material_to_speckle(materials[i])
+        render_material_manager.add_mesh_material_mapping(material, mesh)
+
+    mapped_faces_pointers = [0] * MESH_COUNT
+    mapped_vertices_pointers = [0] * MESH_COUNT
+    mapped_index_counters = [0] * MESH_COUNT
+
+    i = 0
+    face_index = 0
+    while i < FACE_COUNT:
+        mesh_index = material_ids[i]
+        mesh: Mesh = mapped_meshes[mesh_index]
+
+        face_ptr = mapped_faces_pointers[mesh_index]
+        vert_ptr = mapped_vertices_pointers[mesh_index]
+
+        # Add triangle
+        mesh.faces[face_ptr] = 3
+        for j in range(3):
+            # Add vert
+            mesh.faces[face_ptr + 1 + j] = mapped_index_counters[mesh_index] + j
+            vert_index = faces[face_index + j] * 3
+            mapped_vert_offset = vert_ptr + (j * 3)
+
+            mesh.vertices[mapped_vert_offset] = verts[vert_index]
+            mesh.vertices[mapped_vert_offset + 1] = verts[vert_index + 1]
+            mesh.vertices[mapped_vert_offset + 2] = verts[vert_index + 2]
+
+            mesh.vertexNormals[mapped_vert_offset] = normals[vert_index]
+            mesh.vertexNormals[mapped_vert_offset + 1] = normals[vert_index + 1]
+            mesh.vertexNormals[mapped_vert_offset + 2] = normals[vert_index + 2]
+
+        i += 1
+        face_index += 3  # number of items in the faces list we just jumped over
+
+        mapped_index_counters[mesh_index] += (
+            3  # number of verts we just added to the mesh.vertices i.e. the next index
+        )
+        mapped_faces_pointers[mesh_index] += (
+            4  # number of item's we've just added to the mesh.faces list
+        )
+        mapped_vertices_pointers[mesh_index] += (
+            9  # number of item's we've just added to the mesh.vertices list
+        )
+
+    return mapped_meshes  # type: ignore
+
+
+def _material_to_speckle(material: style) -> RenderMaterial:
+    return RenderMaterial(
+        applicationId=material.calc_hash(),
+        name=material.name,
+        diffuse=_color_to_argb(material.diffuse),
+        opacity=1 - material.transparency if material.has_transparency() else 1,
+    )
+
+
+def _color_to_argb(colour: colour) -> int:
+    # Clamp values to [0, 1] and convert to 0–255
+    a_int = 255
+    r_int = max(0, min(255, int(round(colour.r() * 255))))
+    g_int = max(0, min(255, int(round(colour.g() * 255))))
+    b_int = max(0, min(255, int(round(colour.b() * 255))))
+
+    return (a_int << 24) | (r_int << 16) | (g_int << 8) | b_int
+
+
+def _pre_alloc_mesh_lists(
+    shape: TriangulationElement, material_ids: Sequence[int], MESH_COUNT: int
+) -> list[Mesh]:
+    """
+    This is a performance optimisation to pre-size the lists
+    since we're expecting potential hundreds of thousands of verts in a single model
+    This is very much in the hot path, so worth the extra bit of convoluted logic
+    """
+    appId = cast(str, shape.guid)
+
+    material_face_counts = defaultdict(int)
+    for mat_id in material_ids:
+        material_face_counts[mat_id] += 1
+
+    meshes = []
+    for mat_id in range(MESH_COUNT):
+        face_count = material_face_counts.get(mat_id, 0)
+        mesh = Mesh(
+            units="m",
+            vertices=[-1] * (face_count * 9),
+            vertexNormals=[-1] * (face_count * 9),
+            faces=[-1] * (face_count * 4),  # 1 marker + 3 vertex indices
+            applicationId=f"{appId}_mat{mat_id}",
+        )
+        meshes.append(mesh)
+    return meshes

src/speckleifc/converter/project_converter.py

@@ -0,0 +1,23 @@
+from typing import cast
+
+from ifcopenshell.entity_instance import entity_instance
+
+from specklepy.objects.base import Base
+from specklepy.objects.models.collections.collection import Collection
+
+
+def project_to_speckle(
+    step_element: entity_instance, children: list[Base]
+) -> Collection:
+    guid = cast(str, step_element.GlobalId)
+    name = cast(str, step_element.Name or step_element.LongName or guid)
+
+    project = Collection(applicationId=guid, name=name, elements=children)
+
+    project["ifcType"] = step_element.is_a()
+    project["description"] = step_element.Description
+    project["objectType"] = step_element.ObjectType
+    project["longName"] = step_element.LongName
+    project["phase"] = step_element.Phase
+
+    return project

src/speckleifc/converter/spatial_element_converter.py

@@ -0,0 +1,42 @@
+from typing import cast
+
+from ifcopenshell.entity_instance import entity_instance
+
+from speckleifc.property_extraction import extract_properties
+from specklepy.objects.base import Base
+from specklepy.objects.data_objects import DataObject
+from specklepy.objects.models.collections.collection import Collection
+
+
+def spatial_element_to_speckle(
+    display_value: list[Base],
+    step_element: entity_instance,
+    relational_children: list[Base],
+) -> Collection:
+    direct_geometry = _convert_as_data_object(display_value, step_element)
+    all_children = [direct_geometry] + relational_children
+
+    guid = cast(str, step_element.GlobalId)
+    name = cast(str, step_element.Name or step_element.LongName or guid)
+
+    data_object = Collection(applicationId=guid, name=name, elements=all_children)
+    data_object["ifcType"] = step_element.is_a()
+
+    return data_object
+
+
+def _convert_as_data_object(
+    display_value: list[Base], step_element: entity_instance
+) -> DataObject:
+    guid = cast(str, step_element.GlobalId)
+    name = cast(str, step_element.Name or step_element.LongName or guid)
+    data_object = DataObject(
+        applicationId=guid,
+        properties=extract_properties(step_element),
+        name=name,
+        displayValue=display_value,
+    )
+
+    data_object["ifcType"] = step_element.is_a()
+
+    return data_object

src/speckleifc/ifc_geometry_processing.py

@@ -0,0 +1,45 @@
+import multiprocessing
+
+from ifcopenshell import file, ifcopenshell_wrapper, open, sqlite
+from ifcopenshell.geom import iterator, settings
+
+from specklepy.logging.exceptions import SpeckleException
+
+
+def _create_iterator_settings() -> settings:
+    ifc_settings = settings()
+    # triangles for now, speckle does support n-gons, but may be less performant
+    ifc_settings.set("triangulation-type", ifcopenshell_wrapper.TRIANGLE_MESH)
+    # no need to weld verts
+    ifc_settings.set("weld-vertices", False)
+    # Speckle meshes are all in world coords
+    ifc_settings.set("use-world-coords", True)
+    # Tiny performance improvement,
+    ifc_settings.set("no-wire-intersection-check", True)
+    # Rendermaterials inherit the material names instead of type + unique id
+    ifc_settings.set("use-material-names", True)
+
+    # IfcOpenshell defaults to 0.001mm here, which leads to very dense meshes.
+    # lowering the mesh quality a bit here leads to meshes
+    # that are still much higher quality than webifc
+
+    # We still need to experiment with the affect on memory usage
+    # It may be desirable to lower this further, and increase the angular deflection
+    # to compensate. This would allow large meshes to be lower quality,
+    # while keeping small meshes relatively similar.
+    ifc_settings.set("mesher-linear-deflection", 0.2)
+
+    return ifc_settings
+
+
+def open_ifc(file_path: str) -> file:
+    ifc_file = open(file_path)
+
+    if isinstance(ifc_file, file):
+        return ifc_file
+    else:
+        raise SpeckleException(f"file at {file_path} is not a compatible ifc file type")
+
+
+def create_geometry_iterator(ifc_file: file | sqlite) -> iterator:
+    return iterator(_create_iterator_settings(), ifc_file, multiprocessing.cpu_count())

src/speckleifc/ifc_openshell_helpers.py

@@ -0,0 +1,31 @@
+from collections.abc import Generator, Iterable
+from itertools import chain
+from typing import cast
+
+from ifcopenshell.entity_instance import entity_instance
+
+
+def get_children(step_element: entity_instance) -> Generator[entity_instance]:
+    yield from chain(
+        get_spatial_children(step_element), get_aggregate_children(step_element)
+    )
+
+
+def get_spatial_children(step_element: entity_instance) -> Generator[entity_instance]:
+    spatial_relations = cast(
+        Iterable[entity_instance] | None,
+        getattr(step_element, "ContainsElements", None),
+    )
+    if spatial_relations is not None:
+        for relation in spatial_relations:
+            yield from cast(Iterable[entity_instance], relation.RelatedElements)
+
+
+def get_aggregate_children(step_element: entity_instance) -> Generator[entity_instance]:
+    aggregate_relations = cast(
+        Iterable[entity_instance] | None,
+        getattr(step_element, "IsDecomposedBy", None),
+    )
+    if aggregate_relations is not None:
+        for relation in aggregate_relations:
+            yield from cast(Iterable[entity_instance], relation.RelatedObjects)

src/speckleifc/importer.py

@@ -0,0 +1,104 @@
+import time
+from dataclasses import dataclass, field
+from typing import cast
+
+from ifcopenshell.entity_instance import entity_instance
+from ifcopenshell.geom import file
+from ifcopenshell.ifcopenshell_wrapper import TriangulationElement
+
+from speckleifc.converter.data_object_converter import data_object_to_speckle
+from speckleifc.converter.geometry_converter import geometry_to_speckle
+from speckleifc.converter.project_converter import project_to_speckle
+from speckleifc.converter.spatial_element_converter import spatial_element_to_speckle
+from speckleifc.ifc_geometry_processing import create_geometry_iterator
+from speckleifc.ifc_openshell_helpers import get_children
+from speckleifc.render_material_proxy_manager import RenderMaterialProxyManager
+from specklepy.logging.exceptions import SpeckleException
+from specklepy.objects import Base
+
+
+@dataclass
+class ImportJob:
+    ifc_file: file
+    cached_display_values: dict[int, list[Base]] = field(default_factory=dict)  # noqa: F821
+    _render_material_manager: RenderMaterialProxyManager = field(
+        default_factory=lambda: RenderMaterialProxyManager()
+    )
+    geometries_count: int = 0
+    geometries_used: int = 0
+
+    def convert_element(self, step_element: entity_instance) -> Base:
+        children = self._convert_children(step_element)
+        display_value = self.cached_display_values.get(step_element.id(), [])
+
+        if display_value is not None:
+            self.geometries_used += 1
+
+        if step_element.is_a("IfcProject"):
+            return project_to_speckle(step_element, children)
+        elif step_element.is_a("IfcSpatialStructureElement"):
+            return spatial_element_to_speckle(display_value, step_element, children)
+        else:
+            return data_object_to_speckle(display_value, step_element, children)
+
+    def _convert_children(self, step_element: entity_instance) -> list[Base]:
+        return [
+            self.convert_element(i)
+            for i in get_children(step_element)
+            if self._should_convert(i)
+        ]
+
+    @staticmethod
+    def _should_convert(step_element: entity_instance) -> bool:
+        # We only consider IfcRoot objects convertible
+        # This is the super class for root level entities that have a GUID...
+        # This will ignore some types like IfcGridAxis
+        s = step_element.is_a("IfcRoot")
+        if not s:
+            print(
+                f"Skipping #{step_element.id()} because it's type ({step_element.is_a()}) it not an IfcRoot"  # noqa: E501
+            )
+        return s
+
+    def convert(self) -> Base:
+        start = time.time()
+        self.pre_process_geometry()
+        print(f"Geometry conversion complete after {(time.time() - start) * 1000}ms")
+        print(f"Created {self.geometries_count} geometries")
+
+        start = time.time()
+        root = self._convert_project_tree()
+        print(f"Object tree conversion complete after {(time.time() - start) * 1000}ms")
+        print(f"Used {self.geometries_used} geometries")
+        return root
+
+    def pre_process_geometry(self) -> None:
+        iterator = create_geometry_iterator(self.ifc_file)
+        if not iterator.initialize():
+            raise SpeckleException(
+                "geometry iterator failed to initialize for the given file"
+            )
+        self.geometries_count = 0
+        while True:
+            shape = cast(TriangulationElement, iterator.get())
+            self.geometries_count += 1
+            id = cast(int, shape.id)
+
+            display_value = geometry_to_speckle(shape, self._render_material_manager)
+            self.cached_display_values[id] = display_value
+
+            if not iterator.next():
+                break
+
+    def _convert_project_tree(self) -> Base:
+        projects = self.ifc_file.by_type("IfcProject", False)
+        if len(projects) != 1:
+            raise SpeckleException("Expected exactly one IfcProject in file")
+        project = projects[0]
+
+        tree = self.convert_element(project)
+        tree["renderMaterialProxies"] = list(
+            self._render_material_manager.render_material_proxies.values()
+        )
+
+        return tree

src/speckleifc/licenses/IfcOpenShell-GPL-3.0.txt

@@ -0,0 +1,621 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so.  This is fundamentally incompatible with the aim of
+protecting users' freedom to change the software.  The systematic
+pattern of such abuse occurs in the area of products for individuals to
+use, which is precisely where it is most unacceptable.  Therefore, we
+have designed this version of the GPL to prohibit the practice for those
+products.  If such problems arise substantially in other domains, we
+stand ready to extend this provision to those domains in future versions
+of the GPL, as needed to protect the freedom of users.
+
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+                     END OF TERMS AND CONDITIONS

src/speckleifc/licenses/IfcOpenShell-LGPL-3.0.txt

@@ -0,0 +1,165 @@
+                   GNU LESSER GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+
+  This version of the GNU Lesser General Public License incorporates
+the terms and conditions of version 3 of the GNU General Public
+License, supplemented by the additional permissions listed below.
+
+  0. Additional Definitions.
+
+  As used herein, "this License" refers to version 3 of the GNU Lesser
+General Public License, and the "GNU GPL" refers to version 3 of the GNU
+General Public License.
+
+  "The Library" refers to a covered work governed by this License,
+other than an Application or a Combined Work as defined below.
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+
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+
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src/speckleifc/licenses/README.md

@@ -0,0 +1,30 @@
+# Third-Party Licenses
+
+This directory contains license files for third-party dependencies used by specklepy.
+
+## IfcOpenShell
+
+IfcOpenShell is an optional dependency available through the `speckleifc` extra:
+
+```bash
+pip install specklepy[speckleifc]
+```
+
+IfcOpenShell is dual-licensed under:
+
+- **LGPL-3.0** (`IfcOpenShell-LGPL-3.0.txt`) - GNU Lesser General Public License v3.0
+- **GPL-3.0** (`IfcOpenShell-GPL-3.0.txt`) - GNU General Public License v3.0
+
+### About IfcOpenShell
+
+IfcOpenShell is an open source software library for working with Industry Foundation Classes (IFC). It provides complete parsing support for IFC2x3 TC1, IFC4 Add2 TC1, IFC4x1, IFC4x2, and IFC4x3 Add2.
+
+- **Project**: https://github.com/IfcOpenShell/IfcOpenShell
+- **Documentation**: https://docs.ifcopenshell.org/
+- **License**: LGPL-3.0-or-later, GPL-3.0-or-later
+
+When using specklepy with IfcOpenShell, you must comply with the terms of these licenses.
+
+## License Compatibility
+
+specklepy is licensed under Apache-2.0, which is compatible with LGPL-3.0 for dynamic linking scenarios (which is how IfcOpenShell is used as an optional dependency).

src/speckleifc/property_extraction.py

@@ -0,0 +1,92 @@
+from typing import Any
+
+from ifcopenshell.entity_instance import entity_instance
+from ifcopenshell.util.element import get_type
+
+
+def extract_properties(element: entity_instance) -> dict[str, object]:
+    properties: dict[str, object] = {
+        "Attributes": _get_attributes(element),
+        "Property Sets": _get_ifc_object_properties(element),
+    }
+
+    if (ifc_type := get_type(element)) is not None:
+        properties["Element Type Property Sets"] = _get_ifc_element_type_properties(
+            ifc_type,
+        )
+        properties["Element Type Attributes"] = _get_attributes(
+            ifc_type,
+        )
+
+    return properties
+
+
+def _get_attributes(element: entity_instance) -> dict[str, object]:
+    return element.get_info(True, False, scalar_only=True)
+
+
+def _get_ifc_element_type_properties(element: entity_instance) -> dict[str, object]:
+    result: dict[str, object] = {}
+    for definition in element.HasPropertySets or []:
+        if not definition.is_a("IfcPropertySet"):
+            continue
+
+        result[definition.Name] = _get_properties(definition.HasProperties)
+    return result
+
+
+def _get_ifc_object_properties(element: entity_instance) -> dict[str, object]:
+    result: dict[str, object] = {}
+
+    for rel in getattr(element, "IsDefinedBy", []):
+        if not rel.is_a("IfcRelDefinesByProperties"):
+            continue
+
+        definition: entity_instance | None = rel.RelatingPropertyDefinition
+        if not definition:
+            continue
+
+        if not definition.is_a("IfcPropertySet"):
+            continue
+
+        set_name = definition.Name
+        properties = _get_properties(definition.HasProperties)
+
+        if properties:
+            result[set_name] = properties
+
+    return result
+
+
+def _get_properties(properties: entity_instance) -> dict[str, Any]:
+    """
+    There already exists a canonical way to get properties
+    `ifcopenshell.util.element.get_properties` but it's very verbose
+    and we don't want to bloat our selves with supporting complex property types
+
+    This is a slimmed down version, only supporting a couple of property types
+    """
+    result: dict[str, Any] = {}
+
+    for prop in properties:
+        name = prop.Name
+        if prop.is_a("IfcPropertySingleValue"):
+            val = prop.NominalValue
+            if val is not None:
+                result[name] = val.wrappedValue if hasattr(val, "wrappedValue") else val
+        elif prop.is_a("IfcPropertyListValue"):
+            values = getattr(prop, "ListValues", None)
+            if values:
+                result[name] = [
+                    v.wrappedValue if hasattr(v, "wrappedValue") else v for v in values
+                ]
+        elif prop.is_a("IfcPropertyEnumeratedValue"):
+            values = getattr(prop, "EnumerationValues", None)
+            if values:
+                result[name] = [
+                    v.wrappedValue if hasattr(v, "wrappedValue") else v for v in values
+                ]
+
+        # elif prop.is_a("IfcPropertyTableValue"):
+        #     properties[name] = #not sure if we want to support these...
+    return result

src/speckleifc/render_material_proxy_manager.py

@@ -0,0 +1,28 @@
+from specklepy.objects.geometry import Mesh
+from specklepy.objects.other import RenderMaterial
+from specklepy.objects.proxies import RenderMaterialProxy
+
+
+class RenderMaterialProxyManager:
+    def __init__(self):
+        self._render_material_proxies: dict[str, RenderMaterialProxy] = {}
+
+    @property
+    def render_material_proxies(self):
+        return self._render_material_proxies
+
+    def add_mesh_material_mapping(
+        self, render_material: RenderMaterial, mesh: Mesh
+    ) -> None:
+        material_id = render_material.applicationId
+        assert material_id is not None
+        mesh_id = mesh.applicationId
+        assert mesh_id is not None
+
+        proxy = self._render_material_proxies.get(material_id, None)
+        if proxy is not None:
+            proxy.objects.append(mesh_id)
+        else:
+            self._render_material_proxies[material_id] = RenderMaterialProxy(
+                objects=[mesh_id], value=render_material
+            )