Creates a nurbs surface by rotating a contour curve c by an angle a (in degree) around an axis, given by a point o and a direction vector v. The created surface has homogeneous, 3D control points, and is quadratic in one parametric direction.
o and r are typeless nodes to which the coordinates of the point on the axis respectively its direction vector are connected, a is a number node, and c must be a NURBCURV (see 6.7.9).
In the C++ class hierarchy the class created by the NURBSOR keyword is derived from a general trimmed nurbs surface class (see TNURBSURF, 6.7.22), so that it can be used at any places where a trimmed nurbs surface is expected (with the same number format and control point type of course)
The following variations of this keyword exist (some of them define the same internal structures, and are only defined to allow consistent naming conventions):