// Sample scene. 'yuqk crackle.pov +w800 +h800 +p +mv3.8'
    global_settings { assumed_gamma 1.0 }
    #declare VarOrthoMult =
        3.0/max(image_width/image_height,image_height/image_width);
    #declare Camera01z = camera {
        orthographic
        location <0,0,-2>
        direction z
        right VarOrthoMult*x*max(1,image_width/image_height)
        up VarOrthoMult*y*max(1,image_height/image_width)
    }
    #declare Fn = function { pattern { crackle } }
    plane { -z 0
      texture {
        pigment {
            crackle
            repeat <2,4,0>
            scale 1/3
            color_map {
                [-0.5  rgb <1,0,0>]
                [-0.02 rgb <1,1,0>]
                [+0.02 rgb <1,1,0>]
                [+0.5  rgb <0,1,0>]
            }
        }
        finish { emission 1 }
      }
        texture {
        pigment { function { Fn(x,-y,z) } scale 1/100
            color_map {
                [-1    rgbt <1,1,1,0.25>]
                [-0.02 rgbt <1,1,0,1.0>]
                [+0.02 rgbt <1,1,0,1.0>]
                [+1    rgbt <0,0,0,0.25>]
            }
        }
        finish { emission 1 }
        }
    }
    camera { Camera01z }