Norbert Kern wrote:
> 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.
> 
If you know the approximate distance, is it also possible to use
different levels of detail for far away and close objects?
> 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.
> 
> 
> Norbert Kern
> 
> 
> 
>

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