AE: Displacement Maps – After Effects Tutorial
So if you’ve ever wondered how to do gunshot shockwaves or heat distortion, the answer is most likely displacement maps. This tutorial is rather technical and basically explains the general technique for using displacement maps to create distortion-like effects.
For the heat rising effect, I actually followed the following tutorial on AE Tutsplus, which you should check out for more insight into this technique:
Feint DnB – Sleepless
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