Ongoing Results: https://gitlab.com/osarch/FreeMVD_WorkFlow/-/blob/master/IFC_roundtrip_specifications.md#model_lines_straight
Test Files:
FreeMVD: Are experiments on how well certain objects roundtrip in/out of various BIM applications. We are always looking for volunteers, from other BIM applications, to add their results to these tests. If you can participate, ping @yorik or @theoryshaw and they can give you Gitlab push privileges.
The BlenderBIM Add-on currently only imports the "Model/Body/MODEL_VIEW" representation by default. However, if you need non-model elements, like annotations, then you need to enable "Import curves" in the import settings. Then it will import successfully:
Then, once you import it, you will find that you cannot re-export it... at least not with your file. That's because the file you've supplied is produced by Revit, and is actually an invalid IFC. In particular, it has a bug in this line:
#112= IFCGEOMETRICREPRESENTATIONCONTEXT($,'Annotation',3,0.0001,#101,#102);
The Annotation context is not a valid context. That's why it won't round-trip. In fact, the BlenderBIM Add-on's ability to import it is simply because we're a little lenient at the moment - but when I build more granular (and stricter) controls, it will likely fail. Therefore, Revit "Exported IFC File" should be marked as fail.
I have already reported this as a bug to Autodesk: https://github.com/Autodesk/revit-ifc/issues/187
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