Hardened battle royalists will remember Caldera, the sandy island map of bunkers and palm trees in Call Of Duty: Warzone. It got shut down last year as Activision focused their efforts elsewhere, making the map unplayable. But you can now revisit those bullet-strewn beaches. In theory, anyway. Activision have released it as a 4GB open-source project that can be explored in a 3D model-viewing tool. That's cool. But among their reasons for doing so, there lies a predictably grubby logic: they want people to use the data to train AI.
