fix error switching to point cloud representation

Previously it wasn't handled and would always result in errors. It seems the only way to load point cloud representation to BBIM was by loading IFC file and only if this is the only representation of the element.

src/bonsai/bonsai/bim/import_ifc.py

@@ -827,28 +827,12 @@ class IfcImporter:
     def create_pointcloud(
         self, product: ifcopenshell.entity_instance, representation: ifcopenshell.entity_instance
     ) -> Union[ifcopenshell.entity_instance, None]:
-        placement_matrix = self.get_element_matrix(product)
-        vertex_list = []
-        for item in representation.Items:
-            if item.is_a("IfcCartesianPointList3D"):
-                vertex_list.extend(
-                    mathutils.Vector(list(coordinates)) * self.unit_scale for coordinates in item.CoordList
-                )
-            elif item.is_a("IfcCartesianPointList2D"):
-                vertex_list.extend(
-                    mathutils.Vector(list(coordinates)).to_3d() * self.unit_scale for coordinates in item.CoordList
-                )
-            elif item.is_a("IfcCartesianPoint"):
-                vertex_list.append(mathutils.Vector(list(item.Coordinates)) * self.unit_scale)
-
-        if len(vertex_list) == 0:
-            return None
-
-        mesh_name = tool.Geometry.get_representation_name(representation)
-        mesh = bpy.data.meshes.new(mesh_name)
-        mesh.from_pydata(vertex_list, [], [])
+        mesh = tool.Loader.create_point_cloud_mesh(representation)
+        if mesh is None:
+            return
         tool.Ifc.link(representation, mesh)
 
+        placement_matrix = self.get_element_matrix(product)
         obj = bpy.data.objects.new(tool.Loader.get_name(product), mesh)
         self.set_matrix_world(obj, tool.Loader.apply_blender_offset_to_matrix_world(obj, placement_matrix))
         self.link_element(product, obj)

src/bonsai/bonsai/tool/geometry.py

@@ -585,6 +585,16 @@ class Geometry(bonsai.core.tool.Geometry):
         settings.set("keep-bounding-boxes", True)
         context = representation.ContextOfItems
 
+        ifc_importer = bonsai.bim.import_ifc.IfcImporter(ifc_import_settings)
+        ifc_importer.file = tool.Ifc.get()
+
+        # create_shape doesn't support point cloud representations.
+        if representation.RepresentationType in ("PointCloud", "Point"):
+            mesh = tool.Loader.create_point_cloud_mesh(representation)
+            if mesh is None:
+                raise Exception(f"Failed to process point cloud representation: {representation}.")
+            return mesh
+
         if element.is_a("IfcTypeProduct"):
             # You may only specify a single representation when creating shapes for types
             try:
@@ -606,9 +616,6 @@ class Geometry(bonsai.core.tool.Geometry):
                 settings.set("dimensionality", ifcopenshell.ifcopenshell_wrapper.CURVES_SURFACES_AND_SOLIDS)
                 shape = ifcopenshell.geom.create_shape(settings, element, representation)
 
-        ifc_importer = bonsai.bim.import_ifc.IfcImporter(ifc_import_settings)
-        ifc_importer.file = tool.Ifc.get()
-
         if element.is_a("IfcAnnotation") and element.ObjectType == "DRAWING":
             mesh = ifc_importer.create_camera(element, shape)
         if element.is_a("IfcAnnotation") and ifc_importer.is_curve_annotation(element):

src/bonsai/bonsai/tool/loader.py

@@ -651,6 +651,26 @@ class Loader(bonsai.core.tool.Loader):
             except:
                 pass
 
+    @classmethod
+    def create_point_cloud_mesh(cls, representation: ifcopenshell.entity_instance) -> Union[bpy.types.Mesh, None]:
+        unit_scale = ifcopenshell.util.unit.calculate_unit_scale(tool.Ifc.get())
+        vertex_list = []
+        for item in representation.Items:
+            if item.is_a("IfcCartesianPointList3D"):
+                vertex_list.extend(Vector(list(coordinates)) * unit_scale for coordinates in item.CoordList)
+            elif item.is_a("IfcCartesianPointList2D"):
+                vertex_list.extend(Vector(list(coordinates)).to_3d() * unit_scale for coordinates in item.CoordList)
+            elif item.is_a("IfcCartesianPoint"):
+                vertex_list.append(Vector(list(item.Coordinates)) * unit_scale)
+
+        if len(vertex_list) == 0:
+            return None
+
+        mesh_name = tool.Geometry.get_representation_name(representation)
+        mesh = bpy.data.meshes.new(mesh_name)
+        mesh.from_pydata(vertex_list, [], [])
+        return mesh
+
     @classmethod
     def get_offset_point(cls, ifc_file: ifcopenshell.file) -> Union[npt.NDArray[np.float64], None]:
         elements_checked = 0