See #4727. Load alignments (linear elements, linear positioning elements, and referents) by default.

src/blenderbim/blenderbim/bim/import_ifc.py

@@ -241,8 +241,8 @@ class IfcImporter:
         self.profile_code("Create elements")
         self.create_generic_elements(self.annotations)
         self.profile_code("Create annotations")
-        self.create_grids()
-        self.profile_code("Create grids")
+        self.create_positioning_elements()
+        self.profile_code("Create positioning elements")
         self.create_spatial_elements()
         self.profile_code("Create spatial elements")
         self.create_structural_items()
@@ -506,11 +506,25 @@ class IfcImporter:
             if not props.has_blender_offset:
                 tool.Loader.guess_false_origin(self.file)
 
+    def create_positioning_elements(self):
+        self.create_grids()
+        self.create_alignments()
+
+    def create_alignments(self):
+        if not self.ifc_import_settings.should_load_geometry:
+            return
+        if self.file.schema in ("IFC2X3", "IFC4"):
+            return
+        self.create_generic_elements(set(self.file.by_type("IfcLinearPositioningElement")))
+        self.create_generic_elements(set(self.file.by_type("IfcReferent")))
+        # Loading IfcLinearElement for test purposes for now only.
+        # In the future we will make it lazy loaded and toggleable with a special UI.
+        self.create_generic_elements(set(self.file.by_type("IfcLinearElement")))
+
     def create_grids(self):
         if not self.ifc_import_settings.should_load_geometry:
             return
-        grids = self.file.by_type("IfcGrid")
-        for grid in grids:
+        for grid in self.file.by_type("IfcGrid"):
             shape = None
             if not grid.UAxes or not grid.VAxes:
                 # Revit can create invalid grids

src/blenderbim/blenderbim/tool/collector.py

@@ -45,6 +45,14 @@ class Collector(blenderbim.core.tool.Collector):
         elif element.is_a("IfcStructuralItem"):
             collection = cls._create_project_child_collection("IfcStructuralItem")
             cls.link_to_collection_safe(obj, collection)
+        elif element.is_a("IfcLinearPositioningElement"):
+            collection = cls._create_project_child_collection("IfcLinearPositioningElement")
+            collection.hide_viewport = False
+            cls.link_to_collection_safe(obj, collection)
+        elif element.is_a("IfcReferent"):
+            collection = cls._create_project_child_collection("IfcReferent")
+            collection.hide_viewport = False
+            cls.link_to_collection_safe(obj, collection)
         elif tool.Ifc.get_schema() == "IFC2X3" and element.is_a("IfcSpatialStructureElement"):
             if collection := cls._create_own_collection(obj):
                 cls.link_to_collection_safe(obj, collection)
@@ -77,6 +85,7 @@ class Collector(blenderbim.core.tool.Collector):
                                     cls.link_to_collection_safe(obj, drawing_obj.BIMObjectProperties.collection)
         else:
             collection = cls._create_project_child_collection("Unsorted")
+            collection.hide_viewport = False
             cls.link_to_collection_safe(obj, collection)
 
     @classmethod