How do you make a foggy scene?

[Brighton]

I would not try to do this with XSI alone.
It would be much more plausible to use compositing of different passes to achieve the effect.
For one, you could do a Depth pass for a distance based fog.
Then I would have a masked pass of the source for the volume light. Or I suppose Volume lights would be satisfactory. Given I have not used XSI in a while so I am not sure how to accomplish this.

Atmospheric effects will trash render times if you are not careful. Its best to keep the elements separate.

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