Hi Mik,
re:
> I would like to deeply understand of NURBS Export settings, may I ask you for your explanation
> in which case we should use "y" or "n" parameter in MoI ini file?
The case where you could benefit from switching it is if a receiving application works better with one or the other.
It depends on the behavior of the application you're sending it to.
When WriteAnalyticSurfaces=n then surfaces will be written to STEP format as a general B_SPLINE_SURFACE entity. When WriteAnalyticSurfaces=y then surfaces that are planes, cylinders, cones, or spheres will be written as a specialized entity type like PLANE, CYLINDER_SURFACE, etc...
Most of the time if the receiving app cares about analytic geometry they will examine general surfaces and automatically detect if they are actually planes, cylinders, cones, or spheres so it doesn't make any difference. But in certain cases (as Peer encountered here) that might not be how the importer works.
- Michael
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