I have a scene I'm working on which involves a hall in an old building. 
Early in the morning golden light streams through the eastern windows. 
The dust in the room is caught in this light and shows the beams of 
light as they cross the room.

I'm trying to model these beams. I have the light worked out, and I'm 
playing with media, however I can't get it to the point where it's 
(nearly) invisible anywhere else and shows up as a haze where the light 
hits it.

Any help greatly appreciated.

The interior of the room comes from this attempt:
//dust in the room
box {
	<-5,0,-3.0>
	< 5,6, 3.0>
	hollow
	pigment { rgbt 1 }
	interior {
	media {
		scattering { 5, <0.1,0.08,0> }
	}
	}
}

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

I've attached a render of the room (no AA) using the above media and 
without the media.

Cheers!
Rick Measham

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