And I'm still working my way through your MakeObj source. Which Windows compiler do you use? I use Borland C++ 4.52 . if an edge is a crease, or a dart or a corner I thought that there were 2 sorts of edge :: you want to smooth across it, or you don't. But you list 3 types. What do these names mean? I know "dart" as: (1) a small missile, usually as in the game of darts; (2) in dressmaking, a V-shape in the cloth which is sewn over itself to shape the garment.