[PoignardAzur]

The requirements are different from animated movies or games, though.

Backgrounds are, by definition, not what the viewer is going to focus on. Oftentimes they'll even be out of focus and therefore slightly blurred.

Don't get me wrong, Disney's interactive set technique is revolutionary and shows how far Unreal has come, but I still expect future Pixar movies to take hours of rendering for every single frame (because by now that's basically Pixar's selling point).