So I've always loved using luma maps (often based off footage like smoke or water) to guide distortion and blur, I've used that kind of effect for years with great results.
Thing is, despite googling, I only know of two effects that can use maps - Displacement Map and Camera Lens Blur. (Potentially I could be forgetting something really obvious but off the top of my head that's all I got).
My question is - does anyone know of any besides these two? I'm trying to come up with some methods for really experimental stuff so don't hold back on anything just because it seems irrelevant. Anything that can be fed luma to produce a result!
Not exactly a problem but desperate for suggestions, any help would be hugely appreciated :)