OpenVSP can not read in or use a STEP file -- it can export them.
VSP is the best format for analysis. You can read in a *.hrm file and
perform some analysis with it. Or a STL and do a very limited amount
of analysis.
Your best bet is probably to read in the STL and then use that as a
guide to recreate a VSP native geometry. You may want to use FitModel
to help with that process.
Rob
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