With a simple 5 faces Sub-D subd.3dm (92.1 KB)
Zebra analysis shows good continuity:
But the slider to set Sub-D meshing is not used, so there is no control for better zebra quality.
Converting the Sub-D to mesh gives lets you properly use the slider and the result is a nice high quality mesh:
Converting the Sub-D into Nurbs gives this instead: (see near the center of the object)
G2 is even worse.
So it seems that from Sub-D to Nurbs tangency continuity is lost…?
I am doing something wrong?
Creating more cases is simple and seeing it on screen it seems a… defect on the shape.
I went back in thinking i miscliked something, instead it was just the conversion…