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How to do this cool edge effect
I’m struggling to find a good name or even description for this effect, but I’ve seen it in several movies and shows. The last place I saw it was in “Advantage” (AKA Advantage Satan), a horror short currently playing on IFC. Towards the end when they show these creepy kids in white, you can see their shoulders and hair are wavy and distorted, but moving in an upwards directing, almost like white fire, or like they’re steaming or evaporating slightly. And I don’t think it’s just an overlayed animation, since it distorts their fabric and hair as it moves/ripples/whatever.
I’ve seen this effect applied to glowing eyes as well in cheap sci-fi shows.
Does anyone know what this is called, or how I might go about figuring it out?
Thanks!