Hi I´m using the Glass Gizmo for Heat Haze Effects, it gives you a nice distortion. I´m combining (multiplying) there different noise nodes together. A small one that gives me the little ripples and a huge one that gives difference in the strength of the hot air. Like if there is a steam of hot air in one part and it´s colder like a few meters besinde it.
I´m animating the noise in the y axis to let it rise up and animate the z to give it these nice changes in ripples. Try to give your image a blur in special areas with your noise as the hot air scatters the light rays.
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