Has anybody tried this R4 plug-in yet? It uses the modeling techniques of subdivision, but works on n-sided spline surfaces
. It can also convert a subd polygonal cage into t-splines, and then convert t-splines to nurbs patches... It's currently in beta stage, and it only runs within Rhino 4 Beta (no version for R3). I'm going to check it out this week if i have time. I was just curious if anybody else had some experience with it yet...
http://www.tsplines.com/