IFC4 LinkIFC - IfcAdvancedBrep not visible

[klqa_test]

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

[Rafal.Gaweda]

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.

[mikako_harada]

Hi Klqa, 

Not visible part, could it be the same reason as your previous issues, i.e., small element?  

https://forums.autodesk.com/t5/revit-architecture-forum/problem-linking-ifc-extrusions-into-revit-20...

Do you see a warning when you open?  If not, we may add the sample to the enhancement wish in another case.  

https://forums.autodesk.com/t5/revit-architecture-forum/link-ifc2x3-supported-ifc-solid-model-geomet...