> Or perhaps it is because of the probably not much modified ridged
> multifractal function for the foothills' isosurface! That looks somewhat
> artificial, not like a natural terrain relief...
>
You may have seen now my second final. I indeed tweaked the parameters 
of the f_ridged_mf function used for the foothills to get a more 
natural-looking terrain. However, I had to be careful, in particular 
with H, because when too close to 0.0 it broke down the trace() function 
for the vegetation. A assume a max_gradient issue but I am not sure. 
Anyway, I am satisfied with the latest render.

Thomas

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