Hi Jonah - the Reparameterize command in Rhino can change the global UV extents of a surface, but parameterization has other factors in it as well like how it is spaced as your travel through the knot vectors of a surface, not just on the overall scale value.

If I remember right, ACIS is mostly sensitive to the kind of internal parameter spacing and how closely that matches spacing along distances in 3D. The Reparameterize command does not change that kind of internal relative spacing.

But I guess you never know - maybe it would help. If it does then it would certainly be a good idea for ACIS / ViaCAD to incorporate that UV scaling into their importer so that they could handle general NURBS surface inputs instead of ones that happen to have a certain structure.

- Michael