Bill Pragnell wrote:
> Following all this radiosity talk, I have made a minor discovery. I think
> Alain hinted that this was possible in a radiosity-related post last month,
> so it's probably not totally new, but it seems that when using radiosity
> lighting with transparency you get caustics naturally without any need for
> photon-mapping!
> 
> Did anyone else know this?

Yes, I remember when it was added as a feature. It was touted as 
"radiosity through transparent surfaces" or something. It's too bad it 
takes so long to render :/ It would be a cool way to make lens refract a 
window's image onto a wall.

~Sam

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