A small update.

I introduced water preference based on areal height, corrected some errors
and doubled speed by replacing eval_pigment with functions and other small
changes.

The attached images show a test with 16000 plants of 8 different types and
36 iterations. Calculation took 5 h on an old 2.66 GHz P4. The 8 differnt
plant types are represented by the same 4 plant meshes as in WIP1.


Norbert Kern

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