in news:5c655619$1@news.povray.org Thomas de Groot wrote:

> not /truly/ karstic

but it gave inspiration, or at least made me think back many moons when 
trying to create erosion in a df3. The animation of that is gone from the 
server sadly and I don't have it anymore.

I was thinking, let a gradient pigment with some turbulence define the 
chance of a grain placement (yes/no). This creates lager and smaler rocks 
depending on the gray value. Use a somehowe derived pigment to determine 
the hardness of the stone. Remove voronoi cells from the grid depending on 
the hardness. Can be done with some trickery in assigning the labels to 
the cells I think. May need an awfull big grid for that to get something 
coherent. Will investigate.

ingo

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