Hi Steve, each format can have it's own quirks in particular situations so there probably isn't a single format that will always be guaranteed to be the best.
Generally it's best though if there is not a whole lot of additional geometry processing and calculation happening during the translation, and I think possibly SAT format may give the closest to that, since that's the native format of the ACIS geometry library that ViaCAD is based on.
Probably try to turn off any "heal" options, as those increase the amount of processing that is done.
I think the issue with STEP format is that only the 3D edge curve data is transferred through, meaning that the UV parameter space curves need to be calculated by the receiving application and that can be tricky when the 3D curves are right along the "seam" edge of a closed surface.
But you still may run into situations where you'll need to try some other format if you run into a problem.
- Michael
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