If you crease an edge, then subsurf modifier won't round it. But if you have 2 subsurf modifiers, the second will ignore the crease and round the edge. Is there a way around this? I have a situation where I want one subsurf, then some other modifiers, then a second subsurf. Using Simple instead of Catmull-Clark doesn't help.
Top: The starting cube with all edges creased and 1 subsurf modifier with 2 levels of subdivison. Bottom: The same starting cube with all edges creased and 2 subsurf modifiers with 1 level of subdivision each.