Dave says: "Animation Master uses their own brand of spline patches (analogous to Rhino NURBS surfaces, I think), which they claim are better than everyone else's." Well, I feel better now. At least I know I'm not losing my mind... :-> I remembered that Hash is emphatic that their splines aren't NURBs, though what kind of splines Hash does use and how it differs from NURBs splines I couldn't tell you. -Nemo