// Sample scene.
    //   'povray bump_map.pov +w800 +h800 +p +mv3.8 +a0.0 +r4'
    global_settings { assumed_gamma 1.0 }
    background { rgb <0.02,0.02,0.02> }
    #declare Camera00 = camera {
        perspective
        location <3,3,-3.001>*0.9
        sky y
        angle 35
        right x*(image_width/image_height)
        look_at <0,0,0>
    }
    #declare Nrml00 = normal {
        bump_map {  // <---
            function 1200,  600 {  // 1200, 600
              //pattern {
              //    crackle
              //    ip_repeat <12,0,0>
              //    scale <1/24,1/12,1/12>
              //}
              //pattern {
              //    wrinkles
              //    scale <1/(tau*8),1/(tau*4),1/(tau*4)>
              //}
                pattern {
                    leopard
                    scale <1/(tau*16),1/(tau*8),1/(tau*8)>
                }
             // x
            }
            interpolate 0 // 2
            map_type 2    // 2
          //once
        }
      //warp { repeat x }
      //warp { repeat y }
      //warp { repeat x flip x }
      //warp { repeat y flip y }
    }
    #declare White = srgb <1,1,1>;
    #declare Light00 = light_source { <50,150,-250>, White }
    //---
    light_source { Light00 }
    sphere { 0, 1
//  plane { -z, 0
        pigment { rgb 1 }
        normal { Nrml00 bump_size +127 rotate +45*y} // -45 hide seam
    }
    camera { Camera00 }
  //sphere { <0,0,0>, 0.02 pigment {rgb <1,0,0> } }
  //sphere { <1,1,0>, 0.02 pigment {rgb <1,0,0> } }