I need a bit of help. I made a depth_map of a Poser head (see attached) 
and thought that using it in the Rockhead code would be straightforward. 
It is, except that the face remains flat with hardly a hint of features. 
I believe there is nothing wrong with the depth_map itself, so how can I 
improve on this? Here is the basic code used:

//==start code==============================
#declare granite_rock=
texture{
  pigment{
   pigment_pattern{
    bumps scale .15
   }
   pigment_map{
    [-.2 rgb 1]
    [.5
     crackle solid scale .0125/4
     color_map{
      [0 rgb 1]
      [.5 rgb <1,.875,.75>-.5]
      [1 rgb 0]
     }
    ]
   }
  }
  normal{crackle 1 solid  scale .0125/4}
  finish{brilliance .5 diffuse .785}
}

#declare rock=
function{
   pigment {
     spherical //or:
     //boxed
     pigment_map {
       [0.0 rgb 0]
       [0.5 pigment_pattern {
              image_map {
                png"Mapping_test.png" gamma 1.0 interpolate 2
              }
              translate-(x+y)/2
              scale 2
            }
            pigment_map {
              [0.0 rgb 0]
              [0.5 granite
                   scale <5, 0.5, 5>
                   poly_wave 0.5
                   rotate z*12
                   color_map {
                     [0 rgb 0.25]
                     [1 rgb 0.75]
                   }
              ]
              [1.0 rgb 1]
            }
       ]
       [1.0 rgb 1]
     }
   }
}

isosurface {
   function {
     0-rock(x,y,z).grey+0.05
   }
   accuracy 0.001
   max_gradient 2
   all_intersections
   contained_by {box {<-1,-1,-1>,<1,1,1>}}
   texture {granite_rock}
}
//==end code================================

Thanks!

-- 
Thomas

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Attachments:
Download 'mapping_test.png' (48 KB)

Preview of image 'mapping_test.png'