Ongoing Results: https://github.com/OpeningDesign/FreeMVD_WorkFlow/blob/master/IFC_roundtrip_specifications.md#extrusions_arcs
Test Files: https://github.com/OpeningDesign/FreeMVD_WorkFlow/tree/master/Specifications_Test_Files/Extrusions_Arcs
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 Github push privileges.