I'm new to POV-ray, and I can't get photons to refract through the glass
cylinder. Check out the programming language below, and see what I did
wrong.
#include "colors.inc"
#include "textures.inc"
#include "finish.inc"
#include "glass.inc"
global_settings {
  photons {
    count 20000
    autostop 0
    jitter .4
  }
}
camera {
  location <0,5,-10>
  look_at 2
}
light_source {<1000,1000,-1000>White
  photons {refraction on
           reflection on}}
background {rgb<.7,.7,1>}
plane {<0,1,0>,-1
  texture {pigment {
    granite
    turbulence 1
      pigment_map {
        [0, rgb<.2,.1,0>]
        [.5, rgb<.5,.3,.1>]
        [1, rgb<.8,.5,.2>]
    }}
  finish {ambient 1}
}
}
lathe {
  cubic_spline
  6,
  <1,0>,<1.1,0.1>,<1.1,4>,<.5,5>,<.3,7>,<.2,7.5>
  texture {pigment {Col_Glass_Beerbottle}}
  finish {ambient .3
          specular .5 roughness .01
  }
  translate 0
}
lathe {
  cubic_spline
  4,
  <.95,.01>,<1.05,.15>,<1.05,3.9>,<.95,4>
  pigment {Brown}
  finish {ambient .1}}
object {
  cylinder {<4,4,0>,<4,0,0>,1
  pigment {White filter .75}
  finish {ambient .15
          diffuse .5
          reflection .25
          /*irid {.3
                thickness .1
                turbulence 0}*/
} interior {dispersion 1.1}
} photons {
    target 2
    refraction on
    reflection off
    collect off
}
}

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