That explains everything. Only lightsources cause photons, if you'd want to
have caustics created by radiosity, you'd have to use ridiculously high
settings for the tracing depth.

A workaround would be to do a two-pass render. On the first pass, you only
render with a lightsource and photons, which you save to disk using
save_file in the photons-block. On the second pass, you render using
radiosity, but instead of placing an actual lightsource, you just load the
photons using load_file. You'd get the photons without the lightsource that
way.

-- 
"Tim Nikias v2.0"
Homepage: <http://www.nolights.de>

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