431da444@news.povray.org...
>
> Another idea is a 2-pass method:
>
> Render 1 pass with a large area of high ambient filling the window (just 
> outside the window (save the radiosity data with save_file). Then render 
> the second pass as-is, but have the radiosity block replaced with just a 
> load_file and always_sample off statements.

Another idea, but one that doesn't work in Povray AFAIK but could be 
implemented in a patch (I don't think that it's in Megapov) would be to have 
no_image objects able to generate radiosity. I've used that in another 
software for this exact type of effect (soft radiosity light coming from a 
window that doesn't receive enough sky light) and it's really efficient, 
particularly as the light-generating object can be kept close to the target 
(which seems to reduce artifacts) and still be invisible.

G.

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