Is there a way to control subdivision surfaces quality ?
1) If I need extra geometry, I add an edge loop, but this changes the curvature and I have to manually adjust all the new vertices and doing it manually is not good (In 3ds max there is the command Flow Connect, but I don't know if it is good)
2) Given a boundary curve (for example lines in a blueprint) how do I put the interior vertices of the control polyhedron to get a "nice smooth" surface, where "nice smooth" maybe depends on the application (In 3ds max there is the Set Flow command, but I don't understand how it works yet)
3) If I want to force a surface to be convex or concave how do I have to proceed ?
4) Many more problems ......