I tweaked it some more and finally got this:

 isosurface {
     function { f_rounded_box(x,y,z,0,0.85,0.85,0.85) - f_noise3d(x*5, y*5,
z*5)* 0.05 }
     contained_by { box { -1 , 1} }
     max_gradient 25
      pigment {
        gradient y
        color_map {
           [0.00 color Gray90]
           [0.20 color Gray30]
           [0.40 color Gray80]
           [0.60 color Gray20]
           [0.80 color Gray10]
           [1.00 color Gray80]
        }
        turbulence 0.75
        scale <1,0.1,1>
      }
     finish {ambient 0.4}
     scale <0.3,0.1,0.3>
 }

That was the look I was trying to achieve.  Thanks for your help!


"Christoph Hormann" <chr### [at] gmxde> wrote in message
news:3C9CB8C2.E4D0FC55@gmx.de...
>
>
> Patrick Dugan wrote:
> >
> > [...}
> >  isosurface {
> >      function { f_rounded_box(x,y,z,0,1,1,1) - f_noise3d(x*5, y*5, z*5)*
> > 0.25 }
> >      pigment{Red}
> >      scale 0.2
> >  }
> >
> > [...]
> > From the tutorial it
> > seemed to be the most likely function, but it apparently isn't.
>
> As said in the other post you need an appropriate container object.  In
> your example all surfaces are outside the (default) container, therefore
> you only see the container itself.
>
> Christoph
>
> --
> POV-Ray tutorials, IsoWood include,
> TransSkin and more: http://www.tu-bs.de/~y0013390/
> Last updated 18 Mar. 2002 _____./\/^>_*_<^\/\.______

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