In article <web.3da0f0e5e389b6f1ebbd77600@news.povray.org>,
 "Jkior" <jki### [at] zworgcom> wrote:

> I'd like water stains leaking around concrete blocks - so sharp edges won't
> be a problem. However, I can't seem to be able to find anything in the
> documentation explaining object patterns - "object" and "patterns" are the
> ultimate in non-specific search terms in the pov docs.

The object pattern uses one color/pigment/texture for any points inside 
the object, and another for anything outside. Just look in the patterns 
section of the reference. You could make a union of a lot of objects 
representing all the stained areas, this would be simple but it could be 
slow with a lot of objects. (insideness checking, which is what the 
object pattern uses, is usually very fast, but it could pile up with 
lots of objects)
Another possibility would be to use only the stain objects that affect a 
specific block in the texture, so POV doesn't have to do the insideness 
tests for the stains on the other side of the tunnel. This would use 
more memory and would be a lot more complex, but would be faster.


> If object patterns won't work, however, how will it be possible to 
> wrap an image map around the inside of a toroid (CSG) - a curving 
> tunnel, circular in cross section?

I believe this is possible, there is a toroidal mapping available.

-- 
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/

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