Thank you Nathan!!

The picture itself is boring, but to me it shows the accuracy of Nathans
patch.

I modelled a fresnel lens wit a focaldistance of 5 units, put a lightsource
at 5 units from it. The result should be, and is a parallel beam of photons.

photons

      gather 30, 100
      radius 0.1, 2, 0.1
      jitter 0.2
  }

 photons {
      density 0.002
      refraction on
  }

It (800 x 600) took about 5 h 30 m to render on a PII 233.

ingo
--
Met dank aan de muze met het glazen oog.

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