previously it required to save external style attributes to preview the changes, now it's couple clicks saved if you want to preview different blender materials for your styles
Examples:
1) active shading type = EXTERNAL, now after changing it's SHADING attributes and accepting the changes, it will reload EXTERNAL shading back since it's the one that's active.
2) active shading type = SHADING, after adding EXTERNAL shader will reload SHADING style to the material.
Mentioned in #4593
The error message was (it was trying to access curves from the original mesh instead of dummy curve object):
```
Error: Python: Traceback (most recent call last):
File "\blenderbim\bim\module\geometry\operator.py", line 46, in execute
IfcStore.execute_ifc_operator(self, context)
File "\blenderbim\bim\ifc.py", line 349, in execute_ifc_operator
result = getattr(operator, "_execute")(context)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "\blenderbim\bim\module\geometry\operator.py", line 169, in _execute
core.add_representation(
File "\blenderbim\core\geometry.py", line 52, in add_representation
representation = ifc.run(
^^^^^^^^
File "\blenderbim\tool\ifc.py", line 34, in run
return ifcopenshell.api.run(command, IfcStore.get_file(), **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "\blenderbim\libs\site\packages\ifcopenshell\api\__init__.py", line 172, in run
result = usecase_class(ifc_file, **settings).execute()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "\blenderbim\libs\site\packages\ifcopenshell\api\geometry\add_representation.py", line 73, in execute
return self.create_plan_representation()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "\blenderbim\libs\site\packages\ifcopenshell\api\geometry\add_representation.py", line 170, in create_plan_representation
return self.create_annotation2d_representation()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "\blenderbim\libs\site\packages\ifcopenshell\api\geometry\add_representation.py", line 833, in create_annotation2d_representation
items = [self.file.createIfcGeometricCurveSet(self.create_curves(is_2d=True))]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "\blenderbim\libs\site\packages\ifcopenshell\api\geometry\add_representation.py", line 492, in create_curves
curves = self.create_curves_from_curve_ifc2x3(is_2d=is_2d, curve_object_data=dummy.data)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "\blenderbim\libs\site\packages\ifcopenshell\api\geometry\add_representation.py", line 575, in create_curves_from_curve_ifc2x3
for spline in self.settings["geometry"].splines:
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'Mesh' object has no attribute 'splines'
```
it was failing with something very verbose:
```
File "\blenderbim\bim\module\project\operator.py", line 1239, in execute
db = ifcpatch.execute(
^^^^^^^^^^^^^^^^^
File "\blenderbim\libs\site\packages\ifcpatch\__init__.py", line 80, in execute
patcher.patch()
File "\blenderbim\libs\site\packages\ifcpatch\recipes\ExtractPropertiesToSQLite.py", line 137, in patch
properties.append([i, "IFC Material", f"Layer {idx + 1} Name", item.Name])
^^^^^^^^^
File "\blenderbim\libs\site\packages\ifcopenshell\entity_instance.py", line 197, in __getattr__
raise AttributeError(
AttributeError: entity instance of type 'IFC2X3.IfcMaterialLayer' has no attribute 'Name'
Error: Python: Traceback (most recent call last):
File "\blenderbim\bim\module\project\operator.py", line 1239, in execute
db = ifcpatch.execute(
^^^^^^^^^^^^^^^^^
File "\blenderbim\libs\site\packages\ifcpatch\__init__.py", line 80, in execute
patcher.patch()
File "\blenderbim\libs\site\packages\ifcpatch\recipes\ExtractPropertiesToSQLite.py", line 137, in patch
properties.append([i, "IFC Material", f"Layer {idx + 1} Name", item.Name])
^^^^^^^^^
File "\blenderbim\libs\site\packages\ifcopenshell\entity_instance.py", line 197, in __getattr__
raise AttributeError(
AttributeError: entity inTraceback (most recent call last):
File "\Temp\tmpdggt3syt.py", line 9, in <module>
run()
File "\Temp\tmpdggt3syt.py", line 5, in run
bpy.ops.bim.load_linked_project(filepath="/Dormitory-ARC.ifc", false_origin="0,0,0")
File "\Blender\4.1\scripts\modules\bpy\ops.py", line 109, in __call__
ret = _op_call(self.idname_py(), kw)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
RuntimeError: Error: Python: Traceback (most recent call last):
File "\blenderbim\bim\module\project\operator.py", line 1239, in execute
db = ifcpatch.execute(
^^^^^^^^^^^^^^^^^
File "\blenderbim\libs\site\packages\ifcpatch\__init__.py", line 80, in execute
patcher.patch()
File "\blenderbim\libs\site\packages\ifcpatch\recipes\ExtractPropertiesToSQLite.py", line 137, in patch
properties.append([i, "IFC Material", f"Layer {idx + 1} Name", item.Name])
^^^^^^^^^
File "\blenderbim\libs\site\packages\ifcopenshell\entity_instance.py", line 197, in __getattr__
raise AttributeError(
AttributeError: entity instance of type 'IFC2X3.IfcMaterialLayer' has no attribute 'Name'
Location: \Blender\4.1\scripts\modules\bpy\ops.py:109
... truncatedUnregistered Snippets Library
BMAX Connector - UnRegistred!
An error occurred while processing your IFC.
Traceback (most recent call last):
File "\blenderbim\bim\module\project\operator.py", line 949, in execute
self.link_ifc()
File "\blenderbim\bim\module\project\operator.py", line 991, in link_ifc
self.link_blend(blend_filepath)
File "\blenderbim\bim\module\project\operator.py", line 953, in link_blend
with bpy.data.libraries.load(filepath, link=True) as (data_from, data_to):
OSError: load: \Dormitory-ARC.ifc.cache.blend failed to open blend file
Error: Python: Traceback (most recent call last):
File "\blenderbim\bim\module\project\operator.py", line 949, in execute
self.link_ifc()
File "\blenderbim\bim\module\project\operator.py", line 991, in link_ifc
self.link_blend(blend_filepath)
File "\blenderbim\bim\module\project\operator.py", line 953, in link_blend
with bpy.data.libraries.load(filepath, link=True) as (data_from, data_to):
OSError: load: \Dormitory-ARC.ifc.cache.blend failed to open blend file
Location: \Blender\4.1\scripts\modules\bpy\ops.py:109
Traceback (most recent call last):
File "\blenderbim\bim\module\project\operator.py", line 870, in execute
bpy.ops.bim.load_link(filepath=filepath, false_origin=self.false_origin)
File "\Blender\4.1\scripts\modules\bpy\ops.py", line 109, in __call__
ret = _op_call(self.idname_py(), kw)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
RuntimeError: Error: Python: Traceback (most recent call last):
File "\blenderbim\bim\module\project\operator.py", line 949, in execute
self.link_ifc()
File "\blenderbim\bim\module\project\operator.py", line 991, in link_ifc
self.link_blend(blend_filepath)
File "\blenderbim\bim\module\project\operator.py", line 953, in link_blend
with bpy.data.libraries.load(filepath, link=True) as (data_from, data_to):
OSError: load: \Dormitory-ARC.ifc.cache.blend failed to open blend file
Location: \Blender\4.1\scripts\modules\bpy\ops.py:109
```
it was clearing all other blender materials - e.g. blender materials associated with representation items styles. Also had the same issue with affecting extra elements as with unassigning materials
When you would unassign material (e.g. implicitly by removing the object), it might have also removed materials slots from other occurrences of the same type.
Which may had some unexpected sideffects later on - as unassigned styles saving IFC project (BBIM unassigned styles based on a assumption that it was the user decision to remove the materials and related styles).
Dion Moult
