In article <293### [at] 3-enet>, Daniel Matthews <dan#@3-e.net> 
wrote:

> > http://racah.fiz.huji.ac.il/~eldadb/mic-react.html
> > Microscopic Simulation of Reaction-Diffusion Processes
> > 
> > They describe an entire class of common textures found in natural
> > phenomena, that seem to be missing from all of the POV work I have seen
> > over the years, with the exception of a few image maps such as those on G.
> > Tran's Zebras.
> 
> Ugh! That page is a little old (suffering from link rot).
> Here is another,
> http://cnls.lanl.gov/~aric/Simulations/Simulations.html

These seem to be a bit different from the procedural patterns POV uses. 
They look like they have more in common with cellular automata...they 
are computed at a grid of points over a limited domain, such as a finite 
2D square. They are not ideal for POV patterns, though you could 
probably work them into the image_map feature (or possibly the density 
file feature for a 3D version). An external program would be better, you 
could adjust the pattern more easily and there is no real benefit to 
having it part of POV.

It would be interesting to see them "grown" on the surface of an object 
instead of a simple plane, but this would probably require tessellating 
the object, or otherwise coming up with points on the object and 
information about how they are connected by the surface, and I don't 
know how you could apply it to the original object.

-- 
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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