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2d characters in 3d environment.

Hello,
Ive just ineterested in one simple (probably) thing. Is it possible to replace a 3d model of character by animated 2d sprite in the 3d environment(something like in DOOM, yea I know its not fully 3d but it illustrates best)? I think it should be possible, ofcourse. But anyway can you give me a guidlines or at least make me absolutely sure that it would work somehow? If there is some guides on the Internet it would be absolutely brilliant.between Ive found some information on so called billboarding but it`s mostly for Unity and link for UE is broken, also it is not absolutely the thig I need. Main problem is to how make sprites change depending on camera angle and facing of character between at least 4 states.