I was watching this trailer: https://www.youtube.com/watch?v=pWh5388AEHw
Does anyone know what is this effect?
Computer Graphics Stack Exchange is a question and answer site for computer graphics researchers and programmers. It only takes a minute to sign up.Sign up to join this community
I don’t think there’s a formally established name for it, but it’s generally known as distortion, warping, or refraction. It works by taking an already rendered version of the current frame, sampling it with warped/stretched texture coordinates, and, usually, compositing the result back in with the rest of the scene. One of the first games I know of that used it was Half-Life 2, for an effect when the Strider enemies fired their cannon:
For an example of what this looks like in a modern game engine, check out Unreal’s documentation.