> 
> [...]
> > If you want a smooth pattern, use pattern functions and not the function
> > image.
> 
> But when calculations of this functions are very complicated and this pattern
> is intersected many times (for example via reflections) then image function is
> afaik only alternative to speed things up.

You can always generate a function image from the slow function to speed
thinks up.

Christoph

-- 
POV-Ray tutorials, IsoWood include,                 
TransSkin and more: http://www.tu-bs.de/~y0013390/  
Last updated 21 Feb. 2002 _____./\/^>_*_<^\/\.______

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