Christopher James Huff wrote:

> 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.

Hmmm.. a density file could be generated with these methods
http://www.geocities.com/robisais/3dca.html

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