Hi Alberto:

>
http://www.ignorancia.org/uploads/tools-and-objects/geomorph/wips/demo_geomorph-08.jpg
> 
> so, how can I create isosurface bushes like those? 

   Those are very simple:

#declare tree1=
isosurface{
  function{f_sphere(x,y,z,1) + f_granite(x*.125,y*.125,z*.125)*.9 - 
f_granite(x*2,y*2,z*2)*.9}
  max_gradient 1
  contained_by{sphere{0,2}}
  texture{t_tree1}
  double_illuminate
}

   and the texture is a simple granite pattern with several greens on 
the  color map. About placing them over the landscape, see the trace() 
function on the docs: it's very easy to use against any object (a 
heightfield in this case).

--
Jaime

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