In article <8F7FCD07Bseed7@204.213.191.228>, ing### [at] homenl (ingo) 
wrote:

> Generate a "raindrop" with a force between 0 and 10.
> Go to the first voxel in the first layer. If value of the voxel is 0, go 
> to the first voxel in the next layer (=z direction).
> Reduce voxel and raindrop by two. Is there still some juice in the drop, 
> randomly choose a direction +x, -x, +y or -y. Go in that direction till 
> you hit a voxel that is not 0. Reduce voxel and drop by two. Do so until 
> raindrop is 0 or you move outside the df3.
> Then generate a second drop, goto the second drop of the first layer etc. 
> Do so for all voxels in the layer. Then start all over again. Do this 20 
> times for each frame rendered.

Hmm, I wonder how hard it would be to make it follow the contours of the 
surface, and deposit material as well as removing it.

Another possible feature that should be a lot easier to implement: wind. 
Instead of going straight down to the first voxel, allow the direction 
to be skewed a little.

I can see other possibilities for variants of this algorithm: weathering 
on an ancient building or statue, etc.

-- 
Christopher James Huff - Personal e-mail: chr### [at] maccom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://homepage.mac.com/chrishuff/
TAG Web page: http://tag.povray.org/

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