Add support for adding material layer set usages to elements

src/ifcblenderexport/blenderbim/bim/module/material/add_constituent.py

@@ -9,7 +9,7 @@ class Usecase:
             self.settings[key] = value
 
     def execute(self):
-        constituents = list(self.settings["constituent_set"].MaterialConstituents)
+        constituents = list(self.settings["constituent_set"].MaterialConstituents or [])
         constituent = self.file.create_entity("IfcMaterialConstituent", **{"Material": self.settings["material"]})
         constituents.append(constituent)
         self.settings["constituent_set"].MaterialConstituents = constituents

src/ifcblenderexport/blenderbim/bim/module/material/add_layer.py

@@ -9,7 +9,7 @@ class Usecase:
             self.settings[key] = value
 
     def execute(self):
-        layers = list(self.settings["layer_set"].MaterialLayers)
+        layers = list(self.settings["layer_set"].MaterialLayers or [])
         layer = self.file.create_entity("IfcMaterialLayer", **{
             "Material": self.settings["material"],
             "LayerThickness": 0.

src/ifcblenderexport/blenderbim/bim/module/material/add_list_item.py

@@ -9,6 +9,6 @@ class Usecase:
             self.settings[key] = value
 
     def execute(self):
-        materials = list(self.settings["material_list"].Materials)
+        materials = list(self.settings["material_list"].Materials or [])
         materials.append(self.settings["material"])
         self.settings["material_list"].Materials = materials

src/ifcblenderexport/blenderbim/bim/module/material/assign_material.py

@@ -17,8 +17,11 @@ class Usecase:
             self.create_material_association(material_set)
         elif self.settings["type"] == "IfcMaterialLayerSet":
             material_set = self.file.create_entity(self.settings["type"])
-            material_set.MaterialLayers = [self.settings["material"]]
             self.create_material_association(material_set)
+        elif self.settings["type"] == "IfcMaterialLayerSetUsage":
+            material_set = self.file.create_entity("IfcMaterialLayerSet")
+            material_set_usage = self.create_layer_set_usage(material_set)
+            self.create_material_association(material_set_usage)
         elif self.settings["type"] == "IfcMaterialProfileSet":
             material_set = self.file.create_entity(self.settings["type"])
             material_set.MaterialProfiles = [self.settings["material"]]
@@ -28,6 +31,14 @@ class Usecase:
             material_set.Materials = [self.settings["material"]]
             self.create_material_association(material_set)
 
+    def create_layer_set_usage(self, material_set):
+        return self.file.create_entity("IfcMaterialLayerSetUsage", **{
+            "ForLayerSet": material_set,
+            "LayerSetDirection": "AXIS2" if self.settings["product"].is_a("IfcWall") else "AXIS3",
+            "DirectionSense": "POSITIVE",
+            "OffsetFromReferenceLine": 0
+        })
+
     def assign_ifc_material(self):
         rel = self.get_rel_associates_material(self.settings["material"])
         if not rel:

src/ifcblenderexport/blenderbim/bim/module/material/operator.py

@@ -63,6 +63,7 @@ class AssignMaterial(bpy.types.Operator):
                 "material": self.file.by_id(int(obj.BIMObjectMaterialProperties.material)),
             },
         ).execute()
+        Data.load()
         Data.load(obj.BIMObjectProperties.ifc_definition_id)
         return {"FINISHED"}
 

src/ifcblenderexport/blenderbim/bim/module/material/prop.py

@@ -34,11 +34,12 @@ def getMaterialTypes(self, context):
             "IfcMaterial",
             "IfcMaterialConstituentSet",
             "IfcMaterialLayerSet",
+            "IfcMaterialLayerSetUsage",
             "IfcMaterialProfileSet",
             "IfcMaterialList",
         ]
         if IfcStore.get_file().schema == "IFC2X3":
-            material_types = ["IfcMaterial", "IfcMaterialLayerSet", "IfcMaterialList"]
+            material_types = ["IfcMaterial", "IfcMaterialLayerSet", "IfcMaterialLayerSetUsage", "IfcMaterialList"]
         materialtypes_enum.clear()
         materialtypes_enum = [(m, m, "") for m in material_types]
     return materialtypes_enum

src/ifcblenderexport/blenderbim/bim/module/material/ui.py

@@ -53,32 +53,32 @@ class BIM_PT_object_material(Panel):
             if self.product_data["type"] == "IfcMaterialConstituentSet":
                 self.material_set_id = self.product_data["id"]
                 self.material_set_data = Data.constituent_sets[self.material_set_id]
-                self.set_items = self.material_set_data["MaterialConstituents"]
+                self.set_items = self.material_set_data["MaterialConstituents"] or []
                 self.set_data = Data.constituents
                 self.set_item_name = "constituent"
             elif self.product_data["type"] == "IfcMaterialLayerSet":
                 self.material_set_id = self.product_data["id"]
                 self.material_set_data = Data.layer_sets[self.material_set_id]
-                self.set_items = self.material_set_data["MaterialLayers"]
+                self.set_items = self.material_set_data["MaterialLayers"] or []
                 self.set_data = Data.layers
                 self.set_item_name = "layer"
             elif self.product_data["type"] == "IfcMaterialLayerSetUsage":
                 self.material_set_usage = Data.layer_set_usages[self.product_data["id"]]
                 self.material_set_id = self.material_set_usage["ForLayerSet"]
                 self.material_set_data = Data.layer_sets[self.material_set_id]
-                self.set_items = self.material_set_data["MaterialLayers"]
+                self.set_items = self.material_set_data["MaterialLayers"] or []
                 self.set_data = Data.layers
                 self.set_item_name = "layer"
             elif self.product_data["type"] == "IfcMaterialProfileSet":
                 self.material_set_id = self.product_data["id"]
                 self.material_set_data = Data.profile_sets[self.material_set_id]
-                self.set_items = self.material_set_data["MaterialProfiles"]
+                self.set_items = self.material_set_data["MaterialProfiles"] or []
                 self.set_data = Data.profiles
                 self.set_item_name = "profile"
             elif self.product_data["type"] == "IfcMaterialList":
                 self.material_set_id = self.product_data["id"]
                 self.material_set_data = Data.lists[self.material_set_id]
-                self.set_items = self.material_set_data["Materials"]
+                self.set_items = self.material_set_data["Materials"] or []
                 self.set_item_name = "list_item"
             return self.draw_material_ui()
 
@@ -175,7 +175,7 @@ class BIM_PT_object_material(Panel):
         else:
             item = self.set_data[set_item_id]
             row = self.layout.row(align=True)
-            row.label(text=item.get("Name", "Unnamed"), icon="ALIGN_CENTER")
+            row.label(text=item.get("Name", "Unnamed") or "Unnamed", icon="ALIGN_CENTER")
             row.label(text=Data.materials[item["Material"]]["Name"], icon="MATERIAL")
 
         if not is_first:
@@ -200,7 +200,7 @@ class BIM_PT_object_material(Panel):
             name_attr = "Name"
         row = self.layout.row(align=True)
         row.label(text=name_attr)
-        row.label(text=self.material_set_data.get(name_attr, "Unnamed"))
+        row.label(text=self.material_set_data.get(name_attr, "Unnamed") or "Unnamed")
         if hasattr(self.material_set_data, "Description") and self.material_set_data["Description"]:
             row = self.layout.row(align=True)
             row.label(text="Description")
@@ -214,5 +214,5 @@ class BIM_PT_object_material(Panel):
             else:
                 item = self.set_data[item_id]
                 row = self.layout.row(align=True)
-                row.label(text=item.get("Name", "Unnamed"), icon="ALIGN_CENTER")
+                row.label(text=item.get("Name", "Unnamed") or "Unnamed", icon="ALIGN_CENTER")
                 row.label(text=Data.materials[item["Material"]]["Name"], icon="MATERIAL")

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

@@ -25,7 +25,7 @@ def add_object(self, context):
     obj.name = "Slab"
     context.view_layer.active_layer_collection.collection.objects.link(obj)
     if IfcStore.get_file():
-        bpy.ops.bim.assign_class(obj=obj.name, ifc_class="IfcSlab")
+        bpy.ops.bim.assign_class(obj=obj.name, ifc_class="IfcSlab", predefined_type="FLOOR")
     obj.location = context.scene.cursor.location