> I don't really understand, without reflection/refraction you have usually
> only two intersection tests per pixel, where do you want to avoid
> calculations?

Alright, I wasn't sure what happened. Your explanation sounds logical. I
suppose, with radiosity, samples are taken all over the scene, going into a
cache, and then applied to objects as appropiate?

> what about shadowing itself ?
> what about shadow from many lights ?
> what about radiosity lightning recived from itself ?
> what about media somewhere inside or around ?

Don't know.  ;o)

Regards,
Hugo

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