There's a couple of examples in povray.binaries.animations - look for "Heat
Waves".

There's also a post of mine in povray.animations called "Heat Shimmer" that
sort of started the other posts.

The best IMHO is:
----- Original Message ----- 
From: "Jan Walzer" <jan### [at] lzernet>
Newsgroups: povray.binaries.animations
Sent: Tuesday, July 16, 2002 06:22
Subject: Heatwaves #3 [divX]

but there wasn't a reply on how Jan did it

        == John ==

"St." <dot### [at] dotcom> wrote in message news:40aa56b7@news.povray.org...
> Can this be done with Pov? I would imagine that focal_blur could/would
> be used, but how would you produce that undulating, blurred, wavy
> effect behind your scene?
>
>  Any ideas?
>
>  ~Steve~
>
>
>

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