> Actually, I now have an include file with two macros: One that plants a 
> single clump of trees centered at a specified location, and one that 
> populates an entire landscape by planting many clumps at random 
> locations. I can mix and match the two depending on how much control I 
> need over the scene.

Hmm... How about using a heightfield image to tell it where to put more 
trees? :)

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