Extract the U and V control-point count of a surface.

Input parameters:

1. Sf → Surface for control point count. Note that if this surface is of a type other than NURBS, it may not have intrinsic control points. Automatic conversion into NURBS data will allow this component to output values, but those values do not necessarily say anything useful about the original surface.

Output parameters:

1. Nu → Number of control points in the surface U direction.
2. Nv → Number of control points in the surface V direction.