#version 3.7;
global_settings{ assumed_gamma 1.0 }

#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]
             //[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
  max_gradient 200
  all_intersections
  contained_by {box {<-1,-1,-1>,<1,1,1>}}
  texture {granite_rock}
} 

light_source { 200, 1 }
light_source { -200, 0.8 }
light_source { <-200,0,-200>, 0.9 }
camera { location <10,10,-10> 
look_at 0
up y
direction z
right image_width/image_height*x
angle 15
}