Actually, I’d already implemented it in UE4. But it’s really expensive as I mentioned. Excluding objects could help little. It takes 5ms on GTX 660 @1080p rendering only the reflection part in an extremly simple scene. The overall frame rate could hardly reach 50 fps. If disabled all post process effects, it would take 3ms. Still too expensive though. I don’t even wanna use it in my project myself. I believe if it could be efficient enough, there was no reason Ubi and Crytek didn’t implement it for their games.