IfcPatch, Assume Asset Uniqueness By Name

Comments

• theoryshaw

  April 2025

  this help?
  https://github.com/IfcOpenShell/IfcOpenShell/blob/52af302bef0b967fa7605bfbe59b903ee81eb919/src/ifcpatch/ifcpatch/recipes/ExtractElements.py#L43-L50

  
• Gorgious

  May 2025 edited May 2025

  From my understanding profiles, materials and styles do not support global identifiers (GUID) like rooted elements do. GUID are used to identify elements uniquely throughout the life of a project, or when you merge different projects to avoid conflicts. So one of the ways to avoid duplicating these without a global identifier is to assume that if they share the same name, they are the same asset. But it's not always true, two projects can independently define a glass material with different properties but the same name, so you can choose if you want to keep both or merge them.

  
• bernd

  May 2025 edited June 2025

  thank you guys for the link to the code and for the great explanation ...
• bernd

  June 2025 edited June 2025

  from python I use this to run ifcpatch ...

  import ifcopenshell
  import ifcpatch
  in_ifcfile = ifcopenshell.open("C:/Users/BHA/Desktop/ifcpatch_work/22149_ING_N_TRW_20250328y_bimtester.ifc")
  out_ifcfile = ifcpatch.execute({
      "input": in_ifcfile,
      "file": in_ifcfile,
      "recipe": "ExtractElements",
      "arguments": ["IfcSlab"],
  })
  ifcpatch.write(out_ifcfile, "C:/Users/BHA/Desktop/ifcpatch_work/BIMPatch/ZZ_Slabs.ifc")
  

  It seams the assume_asset_uniqueness_by_name is activated with the code above.

  On some models I get corupted geometry if it is activated. If I run ifcpatch from Blender Gui and deactivate the pref I get no corrupted geometry. If I activate it, I get corupted geometry or even a run break.

  I would like to help to debugg the problem ... How can I deactivate the setting in the python code above?

  cheers
• bernd

  June 2025 edited June 2025

  @theoryshaw said:
  this help?
  https://github.com/IfcOpenShell/IfcOpenShell/blob/52af302bef0b967fa7605bfbe59b903ee81eb919/src/ifcpatch/ifcpatch/recipes/ExtractElements.py#L43-L50

  It helped a lot today ... Add Falseto the arguments and assume_asset_uniqueness_by_name is deactivated :-)

  import ifcopenshell
  import ifcpatch
  in_ifcfile = ifcopenshell.open("C:/Users/BHA/Desktop/ifcpatch_work/22149_ING_N_TRW_20250328y_bimtester.ifc")
  out_ifcfile = ifcpatch.execute({
      "input": in_ifcfile,
      "file": in_ifcfile,
      "recipe": "ExtractElements",
      "arguments": ["IfcSlab", False],
  })
  ifcpatch.write(out_ifcfile, "C:/Users/BHA/Desktop/ifcpatch_work/BIMPatch/ZZ_Slabs.ifc")