Among other thing, I myself wrote:

> Media can affect radiosity (media "illuminates" other objects around), but
> radiosity cannot affect media (other objects will not "illuminate" the
> media). (Or was it the other way round?)

A similar question: do photons affect radiosity?

In other words, if I have a bright spot (caustics) generated by photons, 
will this bright zone illuminate surrounding objects with radiosity?

-- 
light_source{9+9*x,1}camera{orthographic look_at(1-y)/4angle 30location
9/4-z*4}light_source{-9*z,1}union{box{.9-z.1+x clipped_by{plane{2+y-4*x
0}}}box{z-y-.1.1+z}box{-.1.1+x}box{.1z-.1}pigment{rgb<.8.2,1>}}//Jellby

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