> Very good suggestions, thank you. I've also thought of another idea: I could
> use an area light to soften the artefacts, then the refraction should hide
> that well enough.
>
> I'll have a play with these ideas and see what works.
>
> --
> Tek
> http://evilsuperbrain.com

You might try using the spotlight with a large fade radius for your
forground(photon) lighting.  Then the number of photons fired should
gradually
decrease with z distance.

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