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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