// Sample scene. 'yuqk f_round_gcd.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)
    }
    #include "functions.inc"
    plane { -z 0.5
        pigment {
            function {
                f_gcd(f_round(x-1),f_round(y),0,0) +
                f_gcd(f_round(x*3),f_round(y),0,1)*10
            }
            raw_wave
            color_map {
                [0  rgb <0.6,0.2,0.1>]
                [32 rgb <0.2,1.0,0.7>]
                [32 rgb <0.0,0.0,0.0>]
                [36 rgb <0.0,0.0,0.0>]
            }
            scale <1/4,1/12,1>
            rotate z*45
        }
        finish { emission 1 }
    }
    camera { Camera01z }