Hi Michael,
is there a way for you for coding to identify which surfaces are part of an original polysurface? Joining the wrong surfaces is a big disadvantage of IGES. Last I got a CAD model by a client, a desin concept with interleaved parts. The parts was stuck into each over without gaps, so surfaces was coplanar and an IGES import caused wrong conections - a worst case for IGES.
-Micha
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