Looks very good indeed!
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If we are serious about helping smoothing by introducing rules on the library, some kind of hint system would be most useful. Like: these following triangles all lay on a curved quad. A bit like the texture projection hints. This would make it possible to generate normals based on a common (cylinder) center instead of the surrounding triangle normals.
Very interesting idea! If it could be retrofitted easily - at least on minifig heads - it would be a great improvement.
