Hi sneather, I'm not aware of any particular issues with MoI's IGES importer. I would need to see the particular IGES file to be able to give you any good information about what's going on there. If you are able to, please send it to me at moi@moi3d.com
There are a few different ways that it is possible to store things in IGES files, I guess that probably the method used for that file is not supported by MoI's IGES reader.
If they have some options they can change at export time, ask them to set it to export "Type 144" trimmed surfaces and see if that works any better.
- Michael
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