> Just active photons for your light source (docs!)> this should do the trick.
In a case like this one, looking for the "caustics" keyword might be worth
it. It's faster, but less precise (caustics will only appear in the original
shadow of the object, whereas photons can get reflected and are properly
refracted. But for this scene, this might not matter that much.
Regards,
Tim
--
"Tim Nikias v2.0"
Homepage: <http://www.nolights.de>
