// Sample scene.
    // 'yuqk interpolateMatrix.pov +w500 +h500 +a0.01 -p +mv3.8 +kff10'
    global_settings { assumed_gamma 1.0 }
    background { rgb 0 }
    #declare VarOrthoMult =
        3.5/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 FnMx = function {
        transform {
            matrix <
                1.0, (frame_number-1)/20, 0.0,
               -(frame_number-1)/20, 1.0, 0.0,
                0.0, 0.0, 1.0,
                0.0, 0.0, 0.0>
            inverse
        }
    }
    #local XX = FnMx(1,0,0).u;
    #local YY = FnMx(0,1,0).u;
    cone {
        <0,0,0> 0.03, <1,0,0>, 0.003
        pigment { rgb <1,1,0> }
        finish { emission 1.0 }
        rotate <0,0,2*degrees(atan2(YY,XX))>
    }
    cone {
        <0,0,0> 0.03, <0,1,0>, 0.003
        pigment { rgb <1,1,0> }
        finish { emission 1.0 }
        rotate <0,0,2*degrees(atan2(YY,XX))>
    }
    cone {
        <0,0,0> 0.03, <-1,0,0>, 0.003
        pigment { rgb <1,1,0> }
        finish { emission 1.0 }
        rotate <0,0,2*degrees(atan2(YY,XX))>
    }
    cone {
        <0,0,0> 0.03, <0,-1,0>, 0.003
        pigment { rgb <1,1,0> }
        finish { emission 1.0 }
        rotate <0,0,2*degrees(atan2(YY,XX))>
    }
    //---------
    cone {
        <0,0,0> 0.03, <1,1,0>, 0.003
        pigment { rgb <1,1,0> }
        finish { emission 1.0 }
        rotate <0,0,-4*degrees(atan2(YY,XX))>
    }
    cone {
        <0,0,0> 0.03, <-1,1,0>, 0.003
        pigment { rgb <1,1,0> }
        finish { emission 1.0 }
        rotate <0,0,-4*degrees(atan2(YY,XX))>
    }
    cone {
        <0,0,0> 0.03, <-1,-1,0>, 0.003
        pigment { rgb <1,1,0> }
        finish { emission 1.0 }
        rotate <0,0,-4*degrees(atan2(YY,XX))>
    }
    cone {
        <0,0,0> 0.03, <1,-1,0>, 0.003
        pigment { rgb <1,1,0> }
        finish { emission 1.0 }
        rotate <0,0,-4*degrees(atan2(YY,XX))>
    }
    //---------
    cone {
        <0,0,0> 0.02, <0.7,0,0>, 0.001
        pigment { rgb <1,0.25,0> }
        finish { emission 1.0 }
        rotate z*22.5
        rotate <0,0,8*degrees(atan2(YY,XX))>
    }
    cone {
        <0,0,0> 0.02, <0,0.7,0>, 0.001
        pigment { rgb <1,0.25,0> }
        finish { emission 1.0 }
        rotate z*22.5
        rotate <0,0,8*degrees(atan2(YY,XX))>
    }
    cone {
        <0,0,0> 0.02, <-0.7,0,0>, 0.001
        pigment { rgb <1,0.25,0> }
        finish { emission 1.0 }
        rotate z*22.5
        rotate <0,0,8*degrees(atan2(YY,XX))>
    }
    cone {
        <0,0,0> 0.02, <0,-0.7,0>, 0.001
        pigment { rgb <1,0.25,0> }
        finish { emission 1.0 }
        rotate z*22.5
        rotate <0,0,8*degrees(atan2(YY,XX))>
    }
    cone {
        <0,0,0> 0.02, <0.7,0,0>, 0.001
        pigment { rgb <1,0.25,0> }
        finish { emission 1.0 }
        rotate z*67.5
        rotate <0,0,8*degrees(atan2(YY,XX))>
    }
    cone {
        <0,0,0> 0.02, <0,0.7,0>, 0.001
        pigment { rgb <1,0.25,0> }
        finish { emission 1.0 }
        rotate z*67.5
        rotate <0,0,8*degrees(atan2(YY,XX))>
    }
    cone {
        <0,0,0> 0.02, <-0.7,0,0>, 0.001
        pigment { rgb <1,0.25,0> }
        finish { emission 1.0 }
        rotate z*67.5
        rotate <0,0,8*degrees(atan2(YY,XX))>
    }
    cone {
        <0,0,0> 0.02, <0,-0.7,0>, 0.001
        pigment { rgb <1,0.25,0> }
        finish { emission 1.0 }
        rotate z*67.5
        rotate <0,0,8*degrees(atan2(YY,XX))>
    }
    camera { Camera01z }