// Persistence Of Vision raytracer version 3.5 sample file.
// Demo using the spiral1 texture ... by Dieter Bayer, May 1994
//
// 9 discs with different spiral1 textures.
//
// The scaling factor of the texture, i.e. the number of turns
// one "arm" of the spiral makes, decreases from left to right.
//
// The number of "arms" of the spiral,
// increases from top to bottom.
//


global_settings { assumed_gamma 2.2 }

#include "colors.inc"
#include "shapes.inc"

/* factors used for positioning the discs */

#declare X = 2.1;
#declare Y = 2.1;

/* arms used */

#declare O1 = 3;
#declare O2 = 6;
#declare O3 = 9;

/* scaling used */

#declare S1 = 100;
#declare S2 = 1;
#declare S3 = 0.2;

/* Spiral 1 */

#declare Spiral1 =
texture {
  pigment {
    spiral1 O1
    color_map { [0.0, 1.0  color Red color Green] }
  }
  finish { ambient 1 }
  scale <S1, S1, S1>
}

/* Spiral 2 */

#declare Spiral2 =
texture {
  pigment {
    spiral1 O1
    color_map { [0.0, 1.0  color Red color Green] }
  }
  finish { ambient 1 }
  scale <S2, S2, S2>
}

/* Spiral 3 */

#declare Spiral3 =
texture {
  pigment {
    spiral1 O1
    color_map { [0.0, 1.0  color Red color Green] }
  }
  finish { ambient 1 }
  scale <S3, S3, S3>
}

/* Spiral 4 */

#declare Spiral4 =
texture {
  pigment {
    spiral1 O2
    color_map { [0.0, 1.0  color Red color Green] }
  }
  finish { ambient 1 }
  scale <S1, S1, S1>
}

/* Spiral 5 */

#declare Spiral5 =
texture {
  pigment {
    spiral1 O2
    color_map { [0.0, 1.0  color Red color Green] }
  }
  finish { ambient 1 }
  scale <S2, S2, S2>
}

/* Spiral 6 */

#declare Spiral6 =
texture {
  pigment {
    spiral1 O2
    color_map { [0.0, 1.0  color Red color Green] }
  }
  finish { ambient 1 }
  scale <S3, S3, S3>
}

/* Spiral 7 */

#declare Spiral7 =
texture {
  pigment {
    spiral1 O3
    color_map { [0.0, 1.0  color Red color Green] }
  }
  finish { ambient 1 }
  scale <S1, S1, S1>
}

/* Spiral 8 */

#declare Spiral8 =
texture {
  pigment {
    spiral1 O3
    color_map { [0.0, 1.0  color Red color Green] }
  }
  finish { ambient 1 }
  scale <S2, S2, S2>
}

/* Spiral 9 */

#declare Spiral9 =
texture {
  pigment {
    spiral1 O3
    color_map { [0.0, 1.0  color Red color Green] }
  }
  finish { ambient 1 }
  scale <S3, S3, S3>
}

camera {
  location <0, 0, -6.5>
  right <4/3, 0, 0>
  up <0, 1, 0>
  sky <0, 1, 0>
  direction <0, 0, 1>
}

background { color SkyBlue }

disc { <0, 0, 0>, <0, 0, 1>, 1 hollow on texture { Spiral1 } translate <-1*X, +1*Y, 0> }

disc { <0, 0, 0>, <0, 0, 1>, 1 hollow on texture { Spiral2 } translate < 0*X, +1*Y, 0> }

disc { <0, 0, 0>, <0, 0, 1>, 1 hollow on texture { Spiral3 } translate <+1*X, +1*Y, 0> }

disc { <0, 0, 0>, <0, 0, 1>, 1 hollow on texture { Spiral4 } translate <-1*X,  0*Y, 0> }

disc { <0, 0, 0>, <0, 0, 1>, 1 hollow on texture { Spiral5 } translate < 0*X,  0*Y, 0> }

disc { <0, 0, 0>, <0, 0, 1>, 1 hollow on texture { Spiral6 } translate <+1*X,  0*Y, 0> }

disc { <0, 0, 0>, <0, 0, 1>, 1 hollow on texture { Spiral7 } translate <-1*X, -1*Y, 0> }

disc { <0, 0, 0>, <0, 0, 1>, 1 hollow on texture { Spiral8 } translate < 0*X, -1*Y, 0> }

disc { <0, 0, 0>, <0, 0, 1>, 1 hollow on texture { Spiral9 } translate <+1*X, -1*Y, 0> }

