def setup(self):
        IfcStore.purge()
        bpy.ops.wm.read_homefile(app_template="")
        if bpy.data.objects:
            bpy.data.batch_remove(bpy.data.objects)
            bpy.ops.outliner.orphans_purge(do_local_ids=True, do_linked_ids=True, do_recursive=True)
        blenderbim.bim.handler.setDefaultProperties(None)