See #5318. Prevent deletion of project or spatial structures.

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

@@ -627,6 +627,8 @@ class OverrideDelete(bpy.types.Operator):
         for obj in context.selected_objects:
             element = tool.Ifc.get_entity(obj)
             if element:
+                if not tool.Geometry.is_deletable(element):
+                    continue
                 if ifcopenshell.util.element.get_pset(element, "BBIM_Array"):
                     self.report({"INFO"}, "Elements that are part of an array cannot be deleted.")
                     return {"FINISHED"}
@@ -754,7 +756,11 @@ class OverrideOutlinerDelete(bpy.types.Operator):
             elif item.bl_rna.identifier == "Object":
                 objects_to_delete.add(bpy.data.objects.get(item.name))
         for obj in objects_to_delete:
-            if tool.Ifc.get_entity(obj):
+            if element := tool.Ifc.get_entity(obj):
+                if not tool.Geometry.is_deletable(element):
+                    if collection := obj.BIMObjectProperties.collection:
+                        collections_to_delete.discard(collection)
+                    continue
                 tool.Geometry.delete_ifc_object(obj)
             else:
                 bpy.data.objects.remove(obj)

src/bonsai/bonsai/tool/geometry.py

@@ -91,6 +91,12 @@ class Geometry(bonsai.core.tool.Geometry):
     def delete_data(cls, data: bpy.types.Mesh) -> None:
         bpy.data.meshes.remove(data)
 
+    @classmethod
+    def is_deletable(cls, element: ifcopenshell.entity_instance) -> bool:
+        if element.is_a("IfcProject") or tool.Root.is_spatial_element(element):
+            return False
+        return True
+
     @classmethod
     def delete_ifc_object(cls, obj: bpy.types.Object) -> None:
         element = tool.Ifc.get_entity(obj)
@@ -138,7 +144,7 @@ class Geometry(bonsai.core.tool.Geometry):
                 if element.VoidsElements:
                     bpy.ops.bim.remove_opening(opening_id=element.id())
         else:
-            is_spatial = element.is_a("IfcSpatialElement") or element.is_a("IfcSpatialStructureElement")
+            is_spatial = tool.Root.is_spatial_element(element)
             if getattr(element, "HasOpenings", None):
                 for rel in element.HasOpenings:
                     bpy.ops.bim.remove_opening(opening_id=rel.RelatedOpeningElement.id())