(Quote)

freeCad:

This is how it looks in FreeCAD when the updated *.ifc is imported - as expected?

I can see in Bonsai that the exported wall has 2 styles assigned to it, that is why there are two colors. unfortunately the style names do not copy FreeCAD material names.

(Quote)

Yes, FreeCAD seems to not use MaterialLayerSets, MaterialLayer or Material when converting to IFC.

The ifc is imported to FreeCAD, like this right?

Yorik is having a baby break : - https://forum.freecad.org/viewtopic.php?t=99877

...and maybe test roundtripping those provided, through Freecad.

Anyone want to submit a multilayer wall from Freecad, that emulates those already there in the repo? https://gitlab.com/osarch/FreeMVD_WorkFlow/-/tree/master/Specifications_Test_Files/Wall_Multilayer/

As I understand, from this discussion, it sounds as though Freecad doesn't use IfcMaterialLayerSets when defining layered walls. Could be wrong. Ping @yorik. :)

(Quote)

Not familiar with IFC, could you help file an issue after discussion at FreeCAD githib please

(Quote)

Thanks for the explanation. It makes sense in the case of how FreeCAD multi-material is defined, as it defines the 'material' and 'thickness'. It looks like the 'thickness' is translated to rectangula

Should bring the discussion / suggestion particularly about IFC import/export back to FreeCAD forum / github, thanks :)

If there is no Material/Style definition as it was in freecad, I think that is another problem.

It seems roundtrip back to FreeCAD is OK

OFF TOPIC: It's interesting that when multimaterial wall is exported to IFC from FreeCAD, the output seems to have those material layers, but they are not exported as 'materials' but as 'profiles'. Se

It seems the multimaterial wall is exported as a single object to OBJ.