"Simon Lemieux" <lem### [at] yahoocom> wrote in message
news:399575D2.7DCAB36E@yahoo.com...
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| are the media_ stuff in the light_source def very necessary?

Not if you want the default which is media interaction on and media
attenuation is off by default and is for fading with distance.  So you don't
really have to put anything into the light source to see media.
You don't need anything in global settings either, not for the usual uses in
official POV-Ray anyhow.
You might want to try putting a density into your media though.  Although it
should be showing that something is there without it too.  But a density
{rgb 1} might be worth a try anyhow.
The scattering amount you have is fairly high I believe so you might also
try 0.1 for that and see what shows up.

Bob

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