"SharkD" <nomail@nomail> 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!

Try a primitive like a box or cylinder.  Give it a completely transparent
texture and no reflective properties, then play with normals and the ior
value (you probably should only use a small ior value I would think)

-tgq

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