I was hoping to create some simple CSG shapes using the CSG primitivies of IGES.
I've only tried FreeCAD, which doesn't seem to like to view them. I asked on
the FreeCAD forums and they say everything is BREP these days and there is no
hope of viewing CSG trees as described by IGES.
However, in the OpenCASCADE source I've found some support for (for example)
IGES entity type 154 (solid cylinder). Does OpenCASCADE support these
primitives? Do any other viewer programs (solidworks)?