feat(objects): mesh transform helper

specklepy/objects/base.py

@@ -252,9 +252,6 @@ class Base(_RegisteringBase):
         if t is None:
             return value
 
-        if value is None:
-            return None
-
         if t.__module__ == "typing":
             origin = getattr(t, "__origin__")
             t = (

specklepy/objects/geometry.py

@@ -391,6 +391,15 @@ class Mesh(
     area: float = None
     volume: float = None
 
+    def transform_to(self, transform: "Transform") -> "Mesh":
+        mesh = Mesh(vertices=transform.apply_to_points_values(self.vertices))
+        for attr in set(self.get_serializable_attributes()) - {"vertices"}:
+            orig_val = getattr(self, attr, None)
+            if orig_val:
+                setattr(mesh, attr, orig_val)
+
+        return mesh
+
 
 class Surface(Base, speckle_type=GEOMETRY + "Surface"):
     degreeU: int = None

specklepy/serialization/base_object_serializer.py

@@ -60,19 +60,14 @@ class BaseObjectSerializer:
             chunkable = False
             detach = False
 
-            # skip props marked to be ignored with "__" or "_"
+            # skip nulls or props marked to be ignored with "__" or "_"
-            if prop.startswith(("__", "_")):
+            if value is None or prop.startswith(("__", "_")):
                 continue
 
             # don't prepopulate id as this will mess up hashing
             if prop == "id":
                 continue
 
-            # allow serialisation of nulls
-            if value is None:
-                object_builder[prop] = value
-                continue
-
             # only bother with chunking and detaching if there is a write transport
             if self.write_transports:
                 dynamic_chunk_match = prop.startswith("@") and re.match(

tests/test_transforms.py

@@ -1,7 +1,7 @@
 from typing import List
 import pytest
 from specklepy.api import operations
-from specklepy.objects.geometry import Point, Vector
+from specklepy.objects.geometry import Mesh, Point, Vector
 from specklepy.objects.other import (
     Transform,
     BlockInstance,
@@ -43,6 +43,15 @@ def vector_value():
     return [1, 1, 2]
 
 
+@pytest.fixture()
+def mesh():
+    return Mesh(
+        vertices=[-7, 5, 1, -8, 4, 0, -7, 3, 0, -6, 4, 0],
+        faces=[1, 1, 2, 3, 0],
+        units="feet",
+    )
+
+
 @pytest.fixture()
 def transform():
     """Translates to [1, 2, 0] and scales z by 0.5"""
@@ -129,4 +138,14 @@ def test_transform_serialisation(transform: Transform):
     serialized = operations.serialize(transform)
     deserialized = operations.deserialize(serialized)
 
-    assert transform.get_id() == deserialized.get_id()
+    assert transform.get_id() == deserialized.get_id()
+
+
+def test_mesh_transform(mesh: Mesh, transform: Transform):
+    new_mesh = mesh.transform_to(transform)
+
+    assert mesh.vertices != new_mesh.vertices
+
+    new_mesh.vertices = mesh.vertices
+
+    assert mesh.get_id() == new_mesh.get_id()