in <3A7092D8.7B3FE2F2@psu.edu> Paul Daniel Jones wrote:

>ARGH!!!  I am trying to make a lens which will generate parallel beams
>of light with a spotlight put at it's focal point. I have tried using
>some formulae from my physics book, but just can't get it. Is there
>anybody out there who could help me?

Don't use a spotlight.

light_source {<9, 0, 0> rgb 1}  

#declare Lens = difference {  // f=5 units
   sphere{0,2.5}
   box{<0,-3,-3>,<3,3,3>}
   texture{T_Glass1}
   interior{ior 1.5}
}   

object {  //condensor, mak parallel beam
   Lens
   photons {
      photons_pass_through
   }
   translate <4,0,0>
}



Ingo

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