Add support for importing IFC groups

src/ifcblenderexport/blenderbim/bim/import_ifc.py

@@ -198,6 +198,7 @@ class IfcImporter():
         self.unit_scale = 1
         self.added_data = {}
         self.native_data = {}
+        self.groups = {}
 
         self.material_creator = MaterialCreator(ifc_import_settings)
 
@@ -218,6 +219,7 @@ class IfcImporter():
         self.parse_native_products()
         self.filter_ifc()
         self.patch_ifc()
+        self.create_groups()
         self.create_type_products()
         self.create_grids()
         # TODO: Deprecate after bug #682 is fixed and the new importer is stable
@@ -365,6 +367,18 @@ class IfcImporter():
         if element.ObjectPlacement.RelativePlacement.RefDirection:
             element.ObjectPlacement.RelativePlacement.RefDirection.DirectionRatios = (1., 0., 0.)
 
+    def create_groups(self):
+        collection = bpy.data.collections.new('Groups')
+        self.project['blender'].children.link(collection)
+        for element in self.file.by_type('IfcGroup'):
+            obj = bpy.data.objects.new(f'IfcGroup/{element.Name}', None)
+            self.add_element_attributes(element, obj)
+            collection.objects.link(obj)
+            self.groups[element.GlobalId] = {
+                'ifc': element,
+                'blender': obj
+            }
+
     def create_grids(self):
         grids = self.file.by_type('IfcGrid')
         for grid in grids:

src/ifcblenderexport/blenderbim/bim/prop.py

@@ -122,7 +122,7 @@ def getIfcProducts(self, context):
     global products_enum
     if len(products_enum) < 1:
         products_enum.extend([(e, e, '') for e in
-            ['IfcElement', 'IfcElementType', 'IfcSpatialElement', 'IfcStructural', 'IfcContext']])
+            ['IfcElement', 'IfcElementType', 'IfcSpatialElement', 'IfcGroup', 'IfcStructural', 'IfcContext']])
     return products_enum
 
 

src/ifcblenderexport/blenderbim/bim/schema.py

@@ -13,6 +13,7 @@ class IfcSchema():
             'IfcContext',
             'IfcElement',
             'IfcSpatialElement',
+            'IfcGroup',
             'IfcStructural',
             'IfcMaterialDefinition',
             'IfcParameterizedProfileDef',

src/ifcblenderexport/getIfcElements.py

@@ -41,9 +41,11 @@ class IFC4Extractor:
 
     def is_descendant_from_class(self, element, class_name):
         if element is None \
-            or "substitutionGroup" not in element.attrib:
+                or 'substitutionGroup' not in element.attrib \
+                or 'type' not in element.attrib:
             return False
-        if element.attrib["substitutionGroup"] == 'ifc:{}'.format(class_name):
+        if element.attrib['substitutionGroup'] == 'ifc:{}'.format(class_name) \
+                or element.attrib['type'] == 'ifc:{}'.format(class_name):
             return True
         return self.is_descendant_from_class(self.get_parent_element(element), class_name)
 
@@ -149,6 +151,7 @@ filename_filters = {
     'IfcContext_IFC4.json': ['IfcContext'],
     'IfcElement_IFC4.json': ['IfcElement'],
     'IfcSpatialElement_IFC4.json': ['IfcSpatialElement'],
+    'IfcGroup_IFC4.json': ['IfcGroup'],
     'IfcStructural_IFC4.json': ['IfcStructuralActivity', 'IfcStructuralItem'],
     'IfcMaterialDefinition_IFC4.json': ['IfcMaterialDefinition'],
     'IfcParameterizedProfileDef_IFC4.json': ['IfcParameterizedProfileDef'],