"Norbert Kern" <nor### [at] t-onlinede> wrote in message 
news:43236855@news.povray.org...
> This demo scene shows three effects useful for planting many things like
> grass, trees, rocks or stones.
>
> 1. If you want to show a dense forest from near to a far distance, you may
> need millions of tree copies. Even povray has problems with millions of
> mesh2 copies.
> But if you show only the visible ones, you need only 75000 trees like in
> this demo file.
> The trick is to define random vectors from the camera position, which 
> point
> only to visible parts and to use them in the trace command.
>
> 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.
>
> 3. I always wanted to draw directly on a test image and to use it for
> different planting effects. This would give maximum control over the 
> result.
> The second image shows the POV logo's image used in the demo scene.
>
> I'll post an (unoptimized) demo file at binaries.scene-files.

Really NICE photo!  (tho not sure it's allowed here) hehe.

Still trying to figure out what you're saying here.. cause I'm a novice with 
POV-Ray.  Sounds like you're trying to define only those trees that are in 
view, and not ALL the trees.... when I ran the veg_many_things_WRITE 
script... I gave up waiting for it to finish, and I think it did only 300 
trees.  Not sure this shortcut of yours is anything short at all.

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