> But this results in a fairly even yellowing of the room. (I've tried
> scattering 1 .. 5 with similar results)

First, use scattering 1 until you get the effect you're looking for.
Changing parameters wildly won't help you out with this sort of problem;
it's likely to just confuse matters.

It looks like you're actually getting the effect that you're asking for, but
it's so poorly sampled that it looks very ugly, like there are window-shaped
yellow things hovering in the air. If you turn up the sampling parameters
then it will probably look right.

Try adding

samples 100

to the media block. If that still doesn't look good, bring it up more. If it
looks great but is too slow, try bringing it down. You want the lowest value
that looks good. You might want to render with +SP16 in the command line to
get a quick preview of the image without rendering every single pixel, since
this may slow things down.

If you really want it to be "invisible anywhere else," then also use
"extinction 0" in the scattering block to turn off the absorption that
occurs everywhere (though you may not want to do this since dust does absorb
light).

 - Slime
 [ http://www.slimeland.com/ ]

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