Hi Michael,

Thanks. I think you're right about the principal design method in Alias, being predominantly sheet-based. I certainly know, from a few earlier attempts with the same model, that there were some odd extending surfaces, and some which also totally intersected. Knowing those would really give MOI fits, I asked the designer to trim and clean up as many of those as possible. But it seems like the next logical step would be to try IGES instead of STEP. The downside there, if I'm not mistaken, is that it's potentially a much more complicated process - whereby I'll have to group all the proper surfaces together. In other words, the layers or object groups in their original Alias file won't make it into MOI, like the way a STEP file works. Right?

Cheers!