Thanks for your comments.

I actually gave some wrong information on the RMF. I apologize.
The scene was left on my HD for abt. 4 weeks and after returning
from holiday I decided to post it asap. Should have recalled
the sources before.

Ok then. The mountains are a superposition of three components:
  - a basic RMF
  - a large scale pigment function using granite
  - a fine scale pigment function using granite that adds
    more fine structure to the surface

The latter two components are modulated by y in order to
increase their weight for higher altitudes.

The following code snipped illustrates this:

  #declare Ridges = function {
    "ridgedmf", <0.5, 2.0, 5.0, 0.3, 20.0>
  }

  #declare Granfunc = function {
    pigment {
      granite
      color_map {
        [0 rgb 0]
        [0.5 rgb 1]
        [1 rgb 0]
      }
    }
  }

  #declare Xshift = 18;
  isosurface {
    function { y -      12*Ridges(0.05*(x+Xshift),0,0.05*z)
                 -  0.10*y*Granfunc(0.5*(x+Xshift),0.5*y,0.5*z)
                 - 0.024*y*Granfunc(1.5*(x+Xshift),1.5*y,1.5*z) }
    contained_by{ box {<-500, -1, -50>, <500, 7, 500>}}
    max_gradient 12
    accuracy 0.000001
    method 2
    texture { T_Ridges_High }
  }


I'll soon render a more detailed view of parts of the mountains.

-Hans-

Christoph Hormann schrieb:
> 
> Hans-Detlev Fink wrote:
> >
> [...]
> >
> > Enjoy
> >
> 
> I'm doing !
> 
> I really like the mountains, could you make a closeup of some mountain parts,
> they really look very different from normal RMF, so i wonder how you did that.
> 
> Christoph
> 
> --
> Christoph Hormann <chr### [at] gmxde>
> Homepage: http://www.schunter.etc.tu-bs.de/~chris/

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