Hello, I was trying to understand and working on a IFC4 export feature from my application.
I've been referring to examples in https://standards.buildingsmart.org/IFC/RELEASE/IFC4_1/FINAL/HTML/schema/ifcgeometricmodelresource/l... but the examples are not showing when I link IFC in Revit2020.
I tried with a simple box and a flat surface, and it shows correct in BimVision.
But it does not show when I linkIFC in Revit2020.
IFC test file attached.
Is there anywhere that I can find more Revit working IfcAdvancedBrep examples that are using IFCBSPLINECURVEWITHKNOTS and IFCRATIONALBSPLINESURFACEWITHKNOTS ?
/zac
Hi @klqa_test
Here You can find Autodesk IFC manual https://damassets.autodesk.net/content/dam/autodesk/draftr/2528/180213_IFC_Handbuch.pdf
Please check it.

Hi Klqa,
Not visible part, could it be the same reason as your previous issues, i.e., small element?
Do you see a warning when you open? If not, we may add the sample to the enhancement wish in another case.
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