I was trying out some of the demos/tutorials, and ran into a problem with the
"filter" command. The problem being that "filter" does not seem to work. This
is in the "csgdemo.pov" tutorial. I followed the code more or less as it
appears in the help guide, but I'm not getting any transparency as the tutorial
says I should. Here's the code as I've written it (slightly different from the
tutorial):

// BEGIN HERE
#include "colors.inc"
camera {
 location <0, 1, -10>
 look_at 0
 angle 36
}

light_source { <500, 500, -1000> White }
plane { y, -1.5
 pigment { checker Green White }
 rotate y*25
}

#declare Lens_With_Hole =
difference {
 intersection {
  sphere { <0, 0, 0>, 1
   // pigment { Blue }
   translate -0.5*x
  }
  sphere { <0, 0, 0>, 1
   // pigment { Red }
   translate 0.5*x
  }
  pigment { Red }
  // scale <1, .25, 1>
  // rotate <30, 0, 45>
  rotate y*90
 }

 cylinder { <0, 0, -1> <0, 0, 0>, .35
  pigment { Blue }
 }
 // rotate y*-30
}

merge {
 object { Lens_With_Hole translate <-.65, .65, 0> }
 object { Lens_With_Hole translate <.65, .65, 0> }
 object { Lens_With_Hole translate <-.65, -.65, 0> }
 object { Lens_With_Hole translate <.65, -.65, 0> }
 pigment { Red filter .5 } // um, filter does not seem to be working
}

// END HERE


Any ideas? Is the tutorial wrong, or did I miss something? Any help would be
appreciated.

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