After importing an IGES file I realized that BRepExtrema_DistShapeShape "crashes" (at least I have not enough memory and I think OCC should never use >6BG for that method). So I isolated the two shapes for tests and stored them in shape29.brep and shape44.brep. First I thought, that some shape healing should help, but the IGES import did that already. Changes of the deflection and other parameters in BRepExtrema_DistShapeShape are also no real help.
I used OpenCASCADE version 6.5.3, but had the same problems with 6.5.0 on a linux machine.
Can anybody reproduce that behaviour? Any suggestions? Any work-around, patches? Every input is welcome