NX in general will create a non-rational spline, that is the weight of each control point (pole) is the same.NX can handle rational splines, for example if created in another CAD system and imported via IGES.Also some of the Section Surface functions will create rational surfaces.
I wonder whether the statements below are correct or not:
1. Isoparametric curves of surfaces created by Studio Surface always are non-rational splines.
2. Isoparametric curves of sufaces created by Edge Blend with Conic shape might be rational splines, just as some surfaces created by Section Surface.
Thanks!