> I do expect benefits in all areas that include colored distance-based
> attenuation, such as with fog, absorbing media (including the extinction
> effect of scattering media) and interior fading.

Won't it also vastly improve any scenes where the "light" is not 
broadband, eg street lights, LEDs, lasers etc. Would fluorescent 
materials be supported?

In theory colometrically correct renders could be produced which I 
imagine would open up new markets for POV use (especially if combined 
with an unbiased tracing option). We need something to keep increasing 
those render times to keep up with new hardware :-)

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