"Greg M. Johnson" wrote:

[rambling snipped - sorry]
 
> This is just a long-winded way of saying I'm more fascinated with
> procedurally-derived concepts, and that I was hoping you had come up with
> some kind of algorithm for weathering.

But that is exactly what HF-lab does. Albeit procedural alogrithms for
alluvial motion is hard to make, and HF-lab is probably just using a
approximation to the process. 

I suspect that you have not tried the program? Originally made by John
Beale now Yann Ramin have continued the work, you can find it here:

<URL:http://www.redshift.com/~yramin/atp/hflab/>

> Wonderful work, nonetheless . . .

Thanks, the HF used to produce the image is a 2000x2000 .png file, and
if I wish to make it bigger it is no problem to use HFlab to double the
output.

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