Hi Micha,

> is there a way for you for coding to identify which surfaces
> are part of an original polysurface?

No, not in all cases. But it is possible to have this information come through properly.

If the IGES file was created with a different "level" (basically the equivalent of a layer in an IGES file) for each part, then there should not be any problem because MoI will only try to join together surfaces that belong to the same level. That was a new function for MoI v2, I added it in for one of the earliest v2 beta releases.

If you have a file that contains number of parts that touch each other at some common edges, and you have no other way to separate them (either by breaking into separate files, or by having parts in separate levels), then you'll need to turn off automatic joining (Options > Import/Export > IGES options > Join surfaces on import) and select the proper pieces manually and join them.

- Michael