Rune wrote:
> 
> To create fire that looks realistic in POV-Ray the usual approach is
> to use both emitting and absorbing media. Absorbing media is used to
> make the fire visible on bright backgrounds.
> 
> But I think in reality fire doesn't absorb light (almost not anyway).

Hot gases *do* absorb light; in fact, they absorb at the exact same
frequencies at which they emit.  This is how astronomers can tell
which gases comprise the sun's corona, various nebulae, etc.

Regards,
John

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