I was experimenting with this rust texture a while back, and never used
it... maybe someone might be interested.

Andrew C

---------------------------------
camera {
 location <0,0,-2.5>
 look_at <0,0,1>
}

light_source {
 <100,100,-100>
 color rgb 1
}
light_source {
 <-100,100,-100>
 color rgb 0.5
}

background { color rgb <0.8,0.8,0.9> }

sphere {
 0,1
 texture {
  pigment {
   color rgb<0.6, 0.6, 0.6>
  }
  finish {
   ambient 0
   diffuse 1
   specular 0.1
   roughness 0.05
   metallic
   reflection 0.1
  }
 }
 texture {
  pigment {
   bozo
   translate <10, 10, 10>
   pigment_map {
    [ 0.0 color rgbt<0.55, 0.55, 0.55, 1> ]
    [ 0.5 bozo
     scale 0.1
     pigment_map {
      [ 0 color rgbt <0.55, 0.55, 0.55, 1> ]
      [ 1 bozo
       scale 0.4
       color_map {
        [ 0 rgb <0.5, 0.5, 0.5> ]
        [ 1 rgb <0.55, 0.55, 0.55> ]
       }
      ]
     }
    ]
   }
  }
  finish {
   ambient 0
   diffuse 1
   specular 0.1
   roughness 0.05
   metallic
   reflection 0.1
  }
  normal {
   bozo
   translate <10, 10, 10>
   normal_map {
    [ 0.0 bozo 0.1 scale <1, 0.1, 1> rotate z*30 ]
    [ 0.5 bozo
     scale 0.1
     normal_map {
      [ 0 bozo 0 ]
      [ 1 bozo 2 ]
     }
    ]
   }
  }
 }
 texture {
  pigment {
   bozo
   pigment_map {
    [ 0 color rgbt <0.7, 0.5, 0.3, 1> ]
    [ 0.4 crackle scale 0.05
     pigment_map {
      [ 0 bozo scale 0.3
       color_map {
        [ 0 rgbt <0.7, 0.5, 0.3, 0.0> ]
        [ 0.5 rgbt <0.7, 0.5, 0.2, 0.0> ]
        [ 1 rgbt <0.7, 0.55, 0.4, 0.0> ]
       }
      ]
      [ 0.2 rgbt <0.6, 0.3, 0.2, 1> ]
      [ 1 rgbt <0.6, 0.3, 0.2, 1> ]
     }
    ]
    [ 0.9 bozo scale 0.3
     color_map {
      [ 0 rgbt <0.7, 0.5, 0.3, 0.0>*0.9 ]
      [ 0.5 rgbt <0.7, 0.5, 0.2, 0.0>*0.9 ]
      [ 1 rgbt <0.7, 0.55, 0.4, 0.0>*0.8 ]
     }
    ]
   }
  }
  finish {
   ambient 0
   diffuse 1
   specular 0.1
   roughness 0.05
   metallic
  }
  normal {
   bozo
   normal_map {
    [ 0 bozo 0 ]
    [ 0.4 crackle 0.1 scale 0.05 ]
    [ 0.8 granite 0.1 scale 0.1 ]
   }
  }
 }
}

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