/*
 * quadric_test2.pov
 */

#include "colors.inc"

// if you change these, you may need to up the photon count!
// focal distance from vertex
#declare foc = .5;
// prism width over 2
#declare pw = 2;

global_settings {
  photons {
    count 60000
    autostop 0
  }
}

object { 
  plane {
    <0, 1, 0>
    0
    pigment {
      checker color rgb <.4,.4,.4>, 
 	      color rgb <.2,.2,.2>
    }
  }
  translate <.5, 0, -.5>
}


// this sphere marks the focal point
/*sphere {
  <0, 0, 0>
  .05
  pigment {color Red}
}*/


object {
  quadric {
    <1,0,0>, <0,0,0>, <0,0,4*foc>, 0
    // use this to swap inside and outside of a quadratic
    //inverse  
    pigment { Silver }
    finish {
      ambient 0
      diffuse 0
      reflection .5
      specular 1
      roughness 0.0005
    }
    photons {
      target
      reflection on
    }
  }
  clipped_by {
    box {
      <-pw, 0, .2>,
      < pw, 1, -pw*pw/(4*foc)>
    }
  }
  bounded_by { clipped_by }
  translate <0,0,foc>
}

camera {
  location <-1, 4, -2.5>
  look_at <0, 0, 0>
}

light_source {
  <0, 8, -6.5>
  color White
}


// temporary sphere to help with placement
/*sphere {
  <pw, 1, -pw*pw/(4*foc)+foc>
  .05
  pigment {color Red}
}*/