Dumb walls now automatically generate wall axis upon update

src/blenderbim/blenderbim/bim/module/parametric/operator.py

@@ -7,6 +7,7 @@ import ifcopenshell.util.element
 import ifcopenshell.util.representation
 from blenderbim.bim.ifc import IfcStore
 from ifcopenshell.api.pset.data import Data as PsetData
+from mathutils import Vector
 
 
 def generate_box(usecase_path, ifc_file, **settings):
@@ -33,6 +34,41 @@ def generate_box(usecase_path, ifc_file, **settings):
         )
 
 
+def generate_dumb_wall_axis(usecase_path, ifc_file, **settings):
+    axis_context = ifcopenshell.util.representation.get_context(ifc_file, "Model", "Axis", "GRAPH_VIEW")
+    if not axis_context:
+        return
+    obj = settings["blender_object"]
+    product = ifc_file.by_id(obj.BIMObjectProperties.ifc_definition_id)
+    parametric = ifcopenshell.util.element.get_psets(product).get("EPset_Parametric")
+    if not parametric or parametric["Engine"] != "BlenderBIM.DumbWall":
+        return
+    old_axis = ifcopenshell.util.representation.get_representation(product, "Model", "Axis", "GRAPH_VIEW")
+    if settings["context"].ContextType == "Model" and getattr(settings["context"], "ContextIdentifier") == "Body":
+        if old_axis:
+            bpy.ops.bim.remove_representation(representation_id=old_axis.id(), obj=obj.name)
+
+        new_settings = settings.copy()
+        new_settings["context"] = axis_context
+
+        mesh = bpy.data.meshes.new("Temporary Axis")
+        start = (Vector(obj.bound_box[3]) + Vector(obj.bound_box[0])) / 2
+        end = (Vector(obj.bound_box[7]) + Vector(obj.bound_box[4])) / 2
+        mesh.from_pydata([start, end], [(0, 1)], [])
+
+        new_settings["geometry"] = mesh
+        new_axis = ifcopenshell.api.run(
+            "geometry.add_representation", ifc_file, should_run_listeners=False, **new_settings
+        )
+        ifcopenshell.api.run(
+            "geometry.assign_representation",
+            ifc_file,
+            should_run_listeners=False,
+            **{"product": product, "representation": new_axis}
+        )
+        bpy.data.meshes.remove(mesh)
+
+
 def calculate_dumb_quantities(usecase_path, ifc_file, **settings):
     unit_scale = ifcopenshell.util.unit.calculate_unit_scale(ifc_file)
     obj = settings["blender_object"]
@@ -74,6 +110,9 @@ class ActivateParametricEngine(bpy.types.Operator):
 
     def execute(self, context):
         ifcopenshell.api.add_post_listener("geometry.add_representation", IfcStore.get_file(), generate_box)
+        ifcopenshell.api.add_post_listener(
+            "geometry.add_representation", IfcStore.get_file(), generate_dumb_wall_axis
+        )
         ifcopenshell.api.add_post_listener(
             "geometry.add_representation", IfcStore.get_file(), calculate_dumb_quantities
         )

src/ifcopenshell-python/ifcopenshell/api/geometry/add_representation.py

@@ -33,7 +33,10 @@ class Usecase:
             self.settings[key] = value
 
     def execute(self):
-        if isinstance(self.settings["geometry"], bpy.types.Mesh):
+        if (
+            isinstance(self.settings["geometry"], bpy.types.Mesh)
+            and self.settings["geometry"] == self.settings["blender_object"].data
+        ):
             self.evaluate_geometry()
         if self.settings["unit_scale"] is None:
             self.settings["unit_scale"] = ifcopenshell.util.unit.calculate_unit_scale(self.file)
@@ -44,7 +47,6 @@ class Usecase:
         return self.create_variable_representation()
 
     def evaluate_geometry(self):
-
         for modifier in self.settings["blender_object"].modifiers:
             if modifier.type == "BOOLEAN":
                 modifier.show_viewport = False