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As promised here are my results:
The trace-Makro is really perfect for my needs, and I wonna thanks you all a lot
for the quick and high-quality answers.
My planting now like this:
#declare map = object {
height_field {
...
}
}
map
#define norm = <0,0,0>;
#while (IN A REGION WE WANT TO PLANT)
#declare h = trace(map, <x,y,2>, <x,y,0>, norm);
#if ((vlength(norm) != 0) & (vlength(h) < 0.5))
object {
tree
translate h
}
#end
#end
This is working pretty good. Thanks again.
Phil
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