Hi Tom,

now i understand, in Silo for example it's called "crease edges". I quickly created a polygon cube like you show, imported it into the free Fusion 360 (for hobbyists etc.) converted to T-Splines and then creased one edge. See attached image. Another one i have tried is to do the same and then refined the mesh in Silo and imported into Rhino trial with "MeshtoNURB" command, resulting in a high surface patches object in MoI, so not ideal...

So if Max could somehow implement a "crease edge" function for poly import and his subd script, this would be awesome!

Regards
Stefan