I have already done a test version. But I have to rebase after some recent changes. I did not consider IFC export, I’ll have to check that.
Great! Thnx!
I really want to test this)
I hope this will appear in the weekly build soon.
While testing out the code I notice that there is an IFC import issue with wall openings. In V0.21 and V0.22 I have to check the “Separate openings” import option to get openings when importing the attached IFC. In V0.20 this is not required. I don’t understand this but I have no experience with IFC export and import. The issue occurs for the new “Opening only” preset, but also for other presets.
https://wiki.freecad.org/Import_Export_Preferences#IFC_import
Not familiar with IFC either, any problem with the attached ifc ?
It shows up fine in a viewer. Checking the file in a text editor reveals that the Opening is stored as a solid, which seems OK as well. Don’t know if other BIM programs will accept the model.
I see, I used to have ifc++ Bernd maintained. Maybe ifcopenshell viewer can be used. Will try when there is a gap.
Have a look at - https://view.ifcopenshell.org/v/XGOsRybQjTspzrKoaRwPdqRCpyGudjuJ
FreeCAD 0.22_pre import with legacy ifc import crash FC, ok with Native-IFC import though.
Seems both has no opening 
Screenshot from 2024-01-24 00-53-33.png
Screenshot from 2024-01-24 00-53-40.png
I have already commented on that I think:
https://devtalk.freecad.org/t/create-empty-wall-opening/74583/27
Attached image is from the Ifc++ viewer.