It's not. It builds on top of the voxel based GI they made for Quantum Break. It looks much better than what's there with it off, but it isn't as precise as what Metro does. As I understood DFs explanation, Control adds an RT step to its GI but Metro's GI is 100% RT (if you enable the option) start to finish.
Could they patch their RT systems into Quantum Break or would it be a huge undertaking with little return?
I was under the impression that one of the huge upsides of Ray Tracing was that it was just enabled and everything happened organically with it interacting with PBR materials and real time shadows meaning no need for artists and engineers pouring over art and trying to match it in game with baked lighting / shadows.
Sorry for dp.