Nice image! I was going to comment on the strange regularity of the tree
colors until I read your third point. =)

> 2. The problem with this method is that parts far away seem less dense
> populated as nearer parts.
> The solution is to find the maximum distance to be populated. Then you
can
> use the inverse quadratic relationship to plant with equal density despite
> different distances.

But since you don't know where that maximum distance occurs, you still have
to shoot the same density of rays everywhere. Do you then use 1/distance^2
as a probability for discarding the ray?

 - Slime
 [ http://www.slimeland.com/ ]

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