The material manager now shows total elements used by a material

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

@@ -114,6 +114,7 @@ def get_material_types(self, context):
 class Material(PropertyGroup):
     name: StringProperty(name="Name")
     ifc_definition_id: IntProperty(name="IFC Definition ID")
+    total_elements: IntProperty(name="Total Elements")
 
 
 class BIMMaterialProperties(PropertyGroup):

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

@@ -389,3 +389,6 @@ class BIM_UL_materials(UIList):
         if item:
             row = layout.row(align=True)
             row.label(text=item.name)
+            row2 = row.row()
+            row2.alignment = "RIGHT"
+            row2.label(text=str(item.total_elements))

src/blenderbim/blenderbim/tool/material.py

@@ -61,6 +61,7 @@ class Material(blenderbim.core.tool.Material):
                 new.name = "Unnamed"
             else:
                 new.name = material.Name or "Unnamed"
+            new.total_elements = len(set(ifcopenshell.util.element.get_elements_by_material(tool.Ifc.get(), material)))
 
     @classmethod
     def is_editing_materials(cls):

src/blenderbim/test/tool/test_material.py

@@ -82,6 +82,7 @@ class TestImportMaterialDefinitions(NewFile):
         props = bpy.context.scene.BIMMaterialProperties
         assert props.materials[0].ifc_definition_id == material.id()
         assert props.materials[0].name == "Name"
+        assert props.materials[0].total_elements == 0
 
     def test_import_material_layer_sets(self):
         ifc = ifcopenshell.file()
@@ -91,6 +92,7 @@ class TestImportMaterialDefinitions(NewFile):
         props = bpy.context.scene.BIMMaterialProperties
         assert props.materials[0].ifc_definition_id == material.id()
         assert props.materials[0].name == "Name"
+        assert props.materials[0].total_elements == 0
 
     def test_import_material_profile_sets(self):
         ifc = ifcopenshell.file()
@@ -100,6 +102,7 @@ class TestImportMaterialDefinitions(NewFile):
         props = bpy.context.scene.BIMMaterialProperties
         assert props.materials[0].ifc_definition_id == material.id()
         assert props.materials[0].name == "Name"
+        assert props.materials[0].total_elements == 0
 
     def test_import_material_constituent_sets(self):
         ifc = ifcopenshell.file()
@@ -109,6 +112,7 @@ class TestImportMaterialDefinitions(NewFile):
         props = bpy.context.scene.BIMMaterialProperties
         assert props.materials[0].ifc_definition_id == material.id()
         assert props.materials[0].name == "Name"
+        assert props.materials[0].total_elements == 0
 
     def test_import_material_lists(self):
         ifc = ifcopenshell.file()
@@ -118,6 +122,7 @@ class TestImportMaterialDefinitions(NewFile):
         props = bpy.context.scene.BIMMaterialProperties
         assert props.materials[0].ifc_definition_id == material.id()
         assert props.materials[0].name == "Unnamed"
+        assert props.materials[0].total_elements == 0
 
 
 class TestIsEditingMaterials(NewFile):