Fix #5952. Aggressively block scaling of IFC elements to prevent user confusion.

src/bonsai/bonsai/bim/import_ifc.py

@@ -261,8 +261,6 @@ class IfcImporter:
         self.profile_code("Setup arrays")
         tool.Project.load_linked_models_from_ifc()
         self.profile_code("Load linked models")
-        self.lock_scales()
-        self.profile_code("Lock objects scales")
         self.add_project_to_scene()
         self.profile_code("Add project to scene")
         if self.ifc_import_settings.should_clean_mesh and len(self.file.by_type("IfcElement")) < 1000:
@@ -1129,20 +1127,6 @@ class IfcImporter:
                     tool.Aggregate.constrain_all_parts_to_aggregate(relating_obj)
         bpy.context.scene.BIMAggregateProperties.aggregate_decorator = True
 
-    def lock_scales(self) -> None:
-        elements = set(self.file.by_type("IfcProduct"))
-        while elements:
-            element = elements.pop()
-            if not getattr(element, "HasOpenings", False):
-                continue
-            voided_elements = tool.Aggregate.get_parts_recursively(element)
-            voided_elements.add(element)
-            elements.difference_update(voided_elements)
-            for element in voided_elements:
-                if not (obj := tool.Ifc.get_object(element)):
-                    continue
-                tool.Geometry.lock_scale(obj)
-
 
 class IfcImportSettings:
     def __init__(self):

src/bonsai/bonsai/bim/module/geometry/__init__.py

@@ -18,6 +18,7 @@
 
 import bpy
 from . import ui, prop, operator
+from bpy.app.handlers import persistent
 
 classes = (
     operator.AddCurvelikeItem,
@@ -89,7 +90,20 @@ classes = (
 addon_keymaps = []
 
 
+@persistent
+def block_scale(scene):
+    if obj := (getattr(bpy.context, "active_object", None) or bpy.context.view_layer.objects.active):
+        if isinstance(obj, bpy.types.Object) and obj.BIMObjectProperties.ifc_definition_id:
+            if obj.scale != (1, 1, 1):
+                obj.scale = (1, 1, 1)
+        elif isinstance(obj, bpy.types.Mesh) and obj.BIMMeshProperties.ifc_definition_id:
+            if obj.scale != (1, 1, 1):
+                obj.scale = (1, 1, 1)
+
+
 def register():
+    bpy.app.handlers.depsgraph_update_pre.append(block_scale)
+
     operator.OverrideDuplicateMoveMacro.define("BIM_OT_override_object_duplicate_move")
     operator.OverrideDuplicateMoveMacro.define("TRANSFORM_OT_translate")
     operator.OverrideDuplicateMoveLinkedMacro.define("BIM_OT_override_object_duplicate_move_linked")
@@ -158,6 +172,8 @@ def register():
 
 
 def unregister():
+    bpy.app.handlers.depsgraph_update_pre.remove(block_scale)
+
     bpy.types.VIEW3D_MT_object.remove(ui.object_menu)
     bpy.types.OUTLINER_MT_object.remove(ui.outliner_menu)
     bpy.types.VIEW3D_MT_object_context_menu.remove(ui.outliner_menu)

src/bonsai/bonsai/tool/collector.py

@@ -43,6 +43,7 @@ class Collector(bonsai.core.tool.Collector):
 
         # Note that tool.Geometry.is_locked is only checked within the if
         # statements for efficiency as it is a slow check.
+        tool.Geometry.lock_scale(obj)
 
         if element.is_a("IfcGridAxis"):
             if tool.Geometry.is_locked(element):

src/bonsai/bonsai/tool/geometry.py

@@ -132,7 +132,6 @@ class Geometry(bonsai.core.tool.Geometry):
         obj.lock_rotation = (True, True, True)
         obj.lock_rotation_w = True
         obj.lock_rotations_4d = True
-        obj.lock_scale = (True, True, True)
 
     @classmethod
     def unlock_object(cls, obj: bpy.types.Object) -> None:
@@ -140,7 +139,6 @@ class Geometry(bonsai.core.tool.Geometry):
         obj.lock_rotation = (False, False, False)
         obj.lock_rotation_w = False
         obj.lock_rotations_4d = False
-        obj.lock_scale = (False, False, False)
 
     @classmethod
     def lock_scale(cls, obj: bpy.types.Object) -> None: