> Second, Displacement mapping is a concept which often apply with mesh (or 
> meshed nurbs...) which is a very small subset of Povray capabilities.

AFAIK POV-Ray doesn't support NURBS.
Displacement mapping is usually done during tesselating shapes into 
triangles - but POV-Ray has no need to tesselate objects (except for 
bezier-patches).
If patched versions of POV-Ray add support for NURBS and SDS, it would 
be a nice feature to add displacement mapping for those objects :-)

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