I want to adapt a 3d fighter game for a pyramid hologram

recently i had an idea to scale up the phone hologram and use it for a game (probably not the first)and i was wondering how i would set the game up to use split screen diagonally across the screen so that the projector projects the game onto the pyramid producing a fake 3d hologram fighter.

edit: the cameras are going to be fixed on the 4 sides if that helps make it easier