"Alain" <ele### [at] netscapenet> wrote in message 
news:436402cb$1@news.povray.org...
> Maybe what you need: use photons in the near part and caustics farther 
> away. Maybe using a light_group for the farther part to fill up any 
> ramaining gap.
> The part that receive the caustics may be lowered a little to hide a dark 
> band. May not be possible, or very dificult to properly do.
> The transition won't be perfect, but the refraction of the vewing rays can 
> make that hard to distinguish. Some judiciously projected shadows can also 
> somewhat hide the transition.
> With your option 2, close by area: high quality photons, middle range with 
> low quality photons, far area use caustics.

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

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