SharkD wrote:
> My question is: how do you simulate the visual distortions caused by high
> heat? I.e., how do you make the air wavy around jet exhausts or candle
> flames?
> 
> Thanks!
> 
> 
Can you fake it with a camera normal?  Localize the normal to the 
specific part of the image you want to see the effect.  This process 
would get complex if you have overlapping objects in front of the 
effect, however.  I haven't played much with camera normals so I'm not 
sure this will produce the desired result, but you might want to give it 
a shot.

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