"Arun Kumar" <aru### [at] yahoocoin> wrote:
>    photons {
>       target
>       collect off
>    }

You did not ask about photons, but I thought I'd point out that this statement
has no effect in this scene.  You'll need to add "refraction on" to get the
effect of focused light.

Also look into autostop, as an intersection of spheres is often not efficiently
bounded.  (If you don't understand this, then just add "autostop 0" to the
photons block in your global_settings.  It may speed up the photons
calculations.)

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