Vahur Krouverk wrote:

> [Snip]

> I intend to create method for POV-Ray objects, which returns surface
> derivatives and implement it for 'parametrizable' objects (as you put
> it: 'safe approach'). For other objects dummy implementation (or
> approximation??) could be made. This is not 'perfect' solution, but it
> allows to use some advanced shaders with POV-Ray (current implementation
> of shader support is limited and it will not be fully supported anyway,
> for it would require too much work, easier would be to use RenderMan
> compliant renderer in such case).

Before wasting to much of your time patching and for my own enlightment, 
is there any real interest for this kind of shader information ?
What does it allow to make ?
For the time being, I even hardly see any interest even just for
the edge detection/celluloid thing... 
so I wonder if it is really worth something.

P.S.: These questions are serious, not rethorical or ironical. 
I would really be interested in URLs which show the advantage of such
derivative information for a shaders, so feel free to reference pages
that contain Renderman pictures...

-- 
Non Sine Numine
http://grimbert.cjb.net/
Puis, s'il advient d'un peu triompher, par hasard,

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