util.shape for materials and material_ids

src/bonsai/bonsai/bim/import_ifc.py

@@ -70,17 +70,6 @@ class MaterialCreator:
 
         self.mesh = mesh
         self.obj = obj
-
-        # mesh["ios_materials"] can contain:
-        # - ifc style id if style assigned to the representation items directly
-        # or through material with a style;
-        # - ifc material id if both true:
-        #   - element has a material without a style;
-        #   - there are parts of the geometry that has no other style assigned to them;
-        # - -1 in case if there is no material;
-        # - 0 in case if there are default materials used.
-        # Though 0 value will not occur as we don't use default materials in IfcImporter.
-
         self.parsed_meshes.add(self.mesh.name)
         self.load_texture_maps(shape_has_openings)
         self.assign_material_slots_to_faces()

src/bonsai/bonsai/bim/module/project/operator.py

@@ -1567,7 +1567,7 @@ class LoadLinkedProject(bpy.types.Operator):
                     has_processed_chunk = False
 
                     ms = np.vstack([default_mat, ifcopenshell.util.shape.get_material_colors(shape.geometry)])
-                    mi = np.frombuffer(shape.geometry.material_ids_buffer, dtype=np.int32)
+                    mi = ifcopenshell.util.shape.get_faces_material_style_ids(shape.geometry)
                     for geom_material_idx, geom_material in enumerate(shape.geometry.materials):
                         if not geom_material.instance_id():
                             ms[geom_material_idx + 1] = (0.8, 0.8, 0.8, 1)