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my theory on meshsmooth'd / subd'd meshes is:
for every edge of a mesh, there are a number of surfaces.
First two surfaces are the primary surface. say you were making a L shaped curve, like on a metal stair step You'd have the two primary polygons that are 90° from eachother, and then you've got the bend. The bend is made up of two secondary polygons, and for best results, the "bevel" polygon. The secondary polygons have as close of a normal direction as possible, to their adjacent primary polygon. so if you've got a stair step top, the verts of the secondary polygon would be the same Z height as the verts from the primary polygon. What this does, is prevent the smoothing from affecting the topology of the primary, and most important shape-defining polygon. Now the bevel polygon, on the case of this stair step, is going to be 45° from the top primary faces. Then begins your verticle secondary and primary face. So now you have a shape something like:
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