// http://xahlee.org/3d/index.html

// POV-Ray texture study

#include "colors.inc"

  light_source {
    100
    color White
  }

camera {
  location <5,6,-7>
  look_at  <0,0,0>
	translate -.8
}

//ior 1.0
//caustics 0.0
//dispersion 1.0
//dispersion_samples 7
//fade_distance 0.0 
//fade_power 0.0
//fade_color <0,0,0>

sphere {<-4,1,4>, 1 texture{pigment{color Gray} finish {phong .7 }}}
sphere {<-2,1,4>, 1 texture{pigment{color Blue} finish {phong .7}}}
sphere {< 0,1,4>, 1 texture{pigment{color Green} finish {phong .7}}}
sphere {< 2,1,4>, 1 texture{pigment{color Red} finish {phong .7  }}}

//progressive ior
sphere {<-5,1,0>, 1 texture{pigment{color Yellow filter 1 }finish{phong .8}} interior {ior 1.0}}
sphere {<-3,1,0>, 1 texture{pigment{color Yellow filter 1 }finish{phong .8}} interior {ior 1.5}}
sphere {<-1,1,0>, 1 texture{pigment{color Yellow filter 1 }finish{phong .8}} interior {ior 2}}
sphere {< 1,1,0>, 1 texture{pigment{color Yellow filter 1 }finish{phong .8}} interior {ior 2.5}}

//progressive ior
sphere {<-5,1,-4>, 1 texture{pigment{color Red transmit .9 }finish{phong .8}} interior {ior 1.0}}
sphere {<-3,1,-4>, 1 texture{pigment{color Red transmit .9 }finish{phong .8}} interior {ior 1.5}}
sphere {<-1,1,-4>, 1 texture{pigment{color Red transmit .9 }finish{phong .8}} interior {ior 2}}
sphere {< 1,1,-4>, 1 texture{pigment{color Red transmit .9 }finish{phong .8}} interior {ior 2.5}}



plane { <0,1,0> // normal vector
      , 0 // distance from origin
  pigment {
    checker color White, color Gray
  }
}