Sascha Ledinsky wrote:
>>
>> Why would you want to do this if it is a mesh anyway and you could 
>> displace the mesh (any mesh, not just patches)?
> 
> 
> 
> Here is an example image of a renderman displacement shader applied to a 
> sphere: [...]

Renderman is using scanline rendering techniques, this has nothing to do 
here.  And there of course is no self shadowing in the image you used as 
example.

> Back to your question:
> I'd agree if we're talking about very-high-resolution triangle meshes 
> only. Displacing the vertices has the same effect as applying a 
> "displacement shader". But I disagree as far as NURBS, other patch 
> meshes, or parametric surfaces in general are concerned (currently POV 
> supports bicubic bezier patches only, and that not very well). 
> Displacing just the controlpoints of a NURBS mesh has certainly not the 
> desired effect!

I'd suggest you reread what i wrote.  This remark shows you have 
completely misunderstood it.

Christoph

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