3eba0869@news.povray.org...
> Hmm... gases don't *appear* reflective... but does a gas have a surface???
The point is IOR variation : on a hot tarmac you can observe air reflecting
the sky  because the temperature of the air film is higher than the ambient
air.
If you have density variation between 2 medias or inside a media, you get
refraction (and reflection if the ior gradient is high enough).

Marc

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