Some CAD system exports a solid model with trimmed faces in IGES/STEP format. In IGES it's entity 402 with format 7. Thus a TopoDS_Compound is created in OCC. Since this TopoDS_Compound is a collection of different types of TopoDS_Shape, so the trimmed faces are actually transfered into TopoDS_Faces and no solid model is created.
In a previous topic (around two years ago) Rob Bachrach wrote that " I use the OneShape function to get it as a single shape. This usually gives me a single solid or a compound of solids". It's good idea. However it seems it doesn't work in current 6.2 version.
Does anyone have any clue or experience on how to get solid model from this iges/step faces import?