David Heys wrote in message <389214A3.136337DC@gci.net>...
>It "seems" that the fade_distance and fade_power are causing the media
>to invert itself. ie, the media does not disappear as the light source
>fades off. instead, it changes from white to black. Now this ends up
>looking kind of cool in this instance, but it may not always be wanted.
>
>Am I missing something obvious? I was using scattering media without
>absorption or emitting. I'll post the image in p.b.i.


Try setting the "extinction" parameter of the media to 0.  A scattering
media is similar to a combined emitting and absorbing media, with the
"extinction" controlling the absorption part.

Mark

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