Aaron,
I liked your spline patch discription for Doug.
I feel that AutoCAD surface handling really stinks. I don't know
anyone who can make use of it. AutoCAD was not designed to be able to
handle entities that require the complex linkages that spline surfaces
require. As I stated in different message, we started to develop a NURBS
ADS package for use within AutoCAD. The biggest task was to try to create a
user interface that was actually usable. If you simplify the program to
only handle patches (4×4's make sense) then the whole task is much easier
to complete.
I have made a note of the spline patch editor concept and plan to
keep it in mind.
Keith.