"Warp" <war### [at] tagpovrayorg> wrote in message
>   Note also that two smooth triangles might not share the same normal
> vectors in their shared vertices. That is, the triangles are smooth, but
> their common edge has a sharp change in lighting (which is often a useful
> feature).

I have this in mind. Thanks. I called it bump mapping or artificial normals,
which shouldn't affect the shape.

I remember one of the nicest example is a coin modeled by a simple
cylinder but with artificial normals on its sides. Since its sihouette is
always from the cylinder, you can never tell its sides are actually flat!

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