This class defines a dependent Extrude surface. An Extrude surface is extruded from a curve sub-object. It is similar to a surface created with the Extrude modifier. The advantage is that an extrude sub-object is part of the NURBS model, so you can use it to construct other curve and surface sub-objects.
Any of the object's properties may be set via optional keyword arguments on the constructor.
The parent curve by NURBSet index.
The start point on the parent curve. This value is only applicable if the curve is closed.