Christoph Hormann wrote:
> 
> - it does not make any sense to add a displacement mapping feature to 
> any higher level shape in POV-Ray that is internally rendered as a mesh.

Yes. I agree. That's exactly what I'm trying to say. Displacement could 
be applied on the internal (triangle) mesh represenation.

> - it is not possible to add a displacement feature to any shape POV-Ray 
> renders analytically.

I know.

> ==> the only shape that could profit from a displacement mapping feature 
> is the mesh but apart from render time subdivision with displacement 

Bicubic patches would profit.
In future (if somone finds it worthwile to implement it) nurbs and all 
kind of subdivision surfaces could profit too.

> this is already possible to implement in SDL (or external programs).

SDL is slow.

To sum it up:
In this thread it was claimed that POV-Ray supports NURBS and that 
POV-Ray can do displacment-mapping. This is simply not true. You can't 
seriously argue that those things are supported *IN* POV-Ray by using an 
*EXTERNAL* application!

-Sascha

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