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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