In article <3b50f379@news.povray.org>, Warp <war### [at] tagpovrayorg> 
wrote:

>   AFAIK patterns do not get info about the incoming ray nor the normal
> vector, so they can't produce a pattern depending on them. Not even a function
> pattern can do this.

It is possible (and fairly easy, though tedious) to make the ray 
information available to patterns, I had to do so for my portal pigment 
patch. I assume the POVMan and aoi pattern patches also have this 
modification.
The surface normal is already available, though...it is part of the 
intersection information.

-- 
Christopher James Huff - chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

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