Jan Walzer wrote:
> 
> [...]
> 
> My question: Do you see any chance, that we can access the internal (faster)
> gradient-function of POV
> as it is probably the case for trace(), or at least a simple macro (doing
> this in SDL-Space) that comes
> with functions.inc in Pov3.5 ? ...

It is possible with type 1 displace warps in megapov, in Povray 3.5 you
can easily make a macro for that (or a function if you only want the
length of the gradient vector), but it would be slower of course, on the
other hand the displace warp code uses 7 evaluations and often 4 would
probably be sufficient.  

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

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