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.


Norbert Kern

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Download 'Tree_Logo.jpg' (259 KB) Download 'pov_logo.jpg' (49 KB)

Preview of image 'Tree_Logo.jpg'

Preview of image 'pov_logo.jpg'