"Warp" <war### [at] tagpovrayorg> wrote in message news:3b49e6de@news.povray.org...
<snip>

>   If you want to optimize, then well... I have never tried optimizing
> media photons usage, but some things come to my mind:
>   Try to restrict the photons to important areas only. I'm sure that your
> camera doesn't even see all that volume anyways, so one way of restricting
> is to shoot photons only to areas which are visible from the camera.
>   Also photons really far away from the camera probably will just melt
> together to form an almost constant fog. Instead of doing it with media
> and photons, try putting a real fog which resembles the same effect. You
> can use turbulence in the fog and scale it so that it looks like light rays.
>

Thanks - sounds like good advice. So, next question. I have a large media
container with ior. I want to restrict photons to just an area of the container,
what is the best way? Gather radius looks hopeful, but the docs aren't very
illuminating....

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