William Tracy wrote:
> If you wanted to really do it right ...

Come to think of it, you could implement what I described as some 
external utility that manipulates a height map, and outputs another 
height map that is read as a density function by the tree macro, in the 
same vein as Nicolas' suggestion.

Actually, the height map transformation would probably be just a simple 
convolve operation that could be hacked together in some image editor.

Hmm ... So many ideas, so little time. :-)

-- 
William Tracy
afi### [at] gmailcom -- wtr### [at] calpolyedu

"You cannot predict the future."
"I knew you were going to say that."

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