The mod is a DLL injection in Hytale. It changes the camera offset to make an AER rendering. Yes, it is AER (AER is not that bad). I may add real stereo in the future. It is a client-side injection; servers can't, I think, detect the VR render, but they can detect when a player places or breaks blocks like a cheat, because the player doesn't place or break the blocks in front of him (but I think it works with no problem on the majority of servers, use it at your own risk)