Slabs with voided profiles are now supported.

src/blenderbim/blenderbim/bim/module/geometry/operator.py

@@ -57,6 +57,7 @@ class AddRepresentation(bpy.types.Operator):
     bl_label = "Add Representation"
     obj: bpy.props.StringProperty()
     context_id: bpy.props.IntProperty()
+    ifc_representation_class: bpy.props.StringProperty()
 
     def execute(self, context):
         obj = bpy.data.objects.get(self.obj) if self.obj else bpy.context.active_object
@@ -91,6 +92,7 @@ class AddRepresentation(bpy.types.Operator):
             "total_items": max(1, len(obj.material_slots)),
             "should_force_faceted_brep": context.scene.BIMGeometryProperties.should_force_faceted_brep,
             "should_force_triangulation": context.scene.BIMGeometryProperties.should_force_triangulation,
+            "ifc_representation_class": self.ifc_representation_class,
         }
 
         result = ifcopenshell.api.run("geometry.add_representation", self.file, **representation_data)

src/blenderbim/blenderbim/bim/module/model/slab.py

@@ -58,8 +58,7 @@ def ensure_solid(usecase_path, ifc_file, settings):
     parametric = ifcopenshell.util.element.get_psets(product).get("EPset_Parametric")
     if not parametric or parametric["Engine"] != "BlenderBIM.DumbSlab":
         return
-    # TODO: check if voids are present
+    settings["ifc_representation_class"] = "IfcExtrudedAreaSolid/IfcArbitraryProfileDefWithVoids"
-    settings["ifc_representation_class"] = "IfcExtrudedAreaSolid/IfcArbitraryClosedProfileDef"
 
 
 class DumbSlabGenerator:
@@ -116,7 +115,12 @@ class DumbSlabGenerator:
         else:
             obj.location[2] -= self.depth
         self.collection.objects.link(obj)
-        bpy.ops.bim.assign_class(obj=obj.name, ifc_class="IfcSlab", predefined_type="FLOOR")
+        bpy.ops.bim.assign_class(
+            obj=obj.name,
+            ifc_class="IfcSlab",
+            predefined_type="FLOOR",
+            ifc_representation_class="IfcExtrudedAreaSolid/IfcArbitraryProfileDefWithVoids",
+        )
         bpy.ops.bim.assign_type(relating_type=self.relating_type.id(), related_object=obj.name)
         element = self.file.by_id(obj.BIMObjectProperties.ifc_definition_id)
         pset = ifcopenshell.api.run("pset.add_pset", self.file, product=element, name="EPset_Parametric")

src/blenderbim/blenderbim/bim/module/model/wall.py

@@ -701,7 +701,11 @@ class DumbWallGenerator:
         if self.collection_obj and self.collection_obj.BIMObjectProperties.ifc_definition_id:
             obj.location[2] = self.collection_obj.location[2]
         self.collection.objects.link(obj)
-        bpy.ops.bim.assign_class(obj=obj.name, ifc_class="IfcWall")
+        bpy.ops.bim.assign_class(
+            obj=obj.name,
+            ifc_class="IfcWall",
+            ifc_representation_class="IfcExtrudedAreaSolid/IfcArbitraryClosedProfileDef",
+        )
         bpy.ops.bim.assign_type(relating_type=self.relating_type.id(), related_object=obj.name)
         element = self.file.by_id(obj.BIMObjectProperties.ifc_definition_id)
         pset = ifcopenshell.api.run("pset.add_pset", self.file, product=element, name="EPset_Parametric")

src/blenderbim/blenderbim/bim/module/root/operator.py

@@ -83,6 +83,7 @@ class AssignClass(bpy.types.Operator):
     predefined_type: bpy.props.StringProperty()
     userdefined_type: bpy.props.StringProperty()
     context_id: bpy.props.IntProperty()
+    ifc_representation_class: bpy.props.StringProperty()
 
     def execute(self, context):
         objects = [bpy.data.objects.get(self.obj)] if self.obj else bpy.context.selected_objects
@@ -111,7 +112,9 @@ class AssignClass(bpy.types.Operator):
         obj.name = "{}/{}".format(product.is_a(), obj.name)
         IfcStore.link_element(product, obj)
 
-        bpy.ops.bim.add_representation(obj=obj.name, context_id=self.context_id)
+        bpy.ops.bim.add_representation(
+            obj=obj.name, context_id=self.context_id, ifc_representation_class=self.ifc_representation_class
+        )
 
         if product.is_a("IfcElementType"):
             self.place_in_types_collection(obj)

src/ifcopenshell-python/ifcopenshell/api/geometry/add_representation.py

@@ -391,6 +391,8 @@ class Usecase:
     def create_arbitrary_void_extrusion_representation(self):
         helper = Helper(self.file)
         indices = helper.auto_detect_arbitrary_profile_with_voids_extruded_area_solid(self.settings["geometry"])
+        if not indices["inner_curves"]:
+            return self.create_arbitrary_extrusion_representation()
         profile_def = helper.create_arbitrary_profile_def_with_voids(
             self.settings["geometry"], indices["profile"], indices["inner_curves"]
         )