Slime wrote:
>>In this case the faked scattering can brighten (or completely wipe) some
>>shadowy areas, which can be inacceptable for some scenes. Also the gas
>>(media) does not take into account the environmental lighting (for the
>>scattering effect), because it does not scatter (diffusely reflect) light.
> 
> I'm not *exactly* sure what you're saying here, but I'm pretty sure that, if
> scattering media interacted flawlessly with radiosity (and so was lit up
> exactly correctly), it would be (theoretically) possible to sample it in
> terms of density and illumination (as long as we're talking about scattering
> type 1), and use the density data for an absorption media and the
> illumination data for emission media, creating exactly the same result.

Faking scattering with emission will not create "exactly the same 
result" if the illumination of the nearby objects is different in the 
long run.

> Yes, this may brighten up some shadowy areas. But that would happen anyway
> with scattering media that responded to radiosity ...

The difference in the brightening can be significant - sufficiently to 
compromise the overall reality of the scene.

William

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