> I did an odd radiosity test, using a sky dome photo for the rad emitter, a gray
> ground plane, and a perfectly-relective sphere for a scene object...
>      (ambient 0 emission 0 diffuse 0 reflection 1.0)
> ... except that I cranked up its reflection to 8.0-- just an arbitrarily HIGH
> value. I also added a normal to it. The result is that the sphere actually
> reflects the incoming radiosity light.. and produces crude 'radiosity caustics'
> on the plane, no photons required! I didn't realize that radiosity light could
> be reflected, without using photons in some way. It seems that the two methods
> do operate in a somewhat similar(?) way.
> 
> 
> 

The same also happen with transparent objects. A lens can project an 
image of what is in front of it on a surface behind it.

I first experience it with the woodbox scene modified to use radiosity 
and adding a light probe.

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