Inspired by Gail's cool Spectacular Landscapes WIP: a fully procedural 
cratered terrain. My first attempt on this involved some creative use of 
functions and f_noise3d. It wasn't half-bad, but way too slow. This image 
uses another method I came up with: crackle form <1,0,0> pattern, some 
fiddling with functions and a spline to get the right kind of slope. If 
someone is interested, I can describe the technique more accurately and/or 
post the source to the newsgroups.

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