I am experimenting with isosurfaces to make rock landscapes, using as a 
basis my arcane Geomorph macro of several years ago.

I am fairly satisfied with the rocks, but I have difficulties with the 
texture. I use a slope/altitude texture where I would like the grass to 
show on the /upper/ sides of rock ridges and not on the /underside/ as 
it does now. I tried different settings but to no avail. This is the 
code I use for the shown image:

texture {
   slope {
     <0.0, 0.3, 0.0> , 0.0 , 0.5
     altitude <0, 1-0.3, 0.0> , LowerBound , UpperBound
   }
   texture_map {
     [0.60 Grass]
     [0.65 Soil]
     [0.80 Rocks]
   }
}

Any idea how I could achieve what I want? The difficulty imo resides 
with the use of isosurfaces which have overhangs. A height_field would 
be easier in this case.

Thomas

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