By the time Carmack joined the Oculus Rift's CV1 technology and design was mostly finished. Carmack is reportedly focused on Oculus's mobile offerings which we

By the time Carmack joined the Oculus Rift's CV1 technology and design was mostly finished. Carmack is reportedly focused on Oculus's mobile offerings which we have yet to see or is indeed the Santa Cruz prototype which, if rumors are to believed, is a mobile SoC powered inside-out markerless VR headset. When I saw the SC prototype I instantly thought this is what Carmack must has been working on. Not shoving cellphones into $20 goggles and working out the kinks like many think mobile VR would turn out. I think there's some practical considerations here with the "magic engineer" who can do anything quickly and, of course, the laws of diminishing or even negative returns outlined in books like the Mythical Man-Month. Even the impressive Santa Cruz is years out from being sold. Graphically it cannot compete with the PC-based systems it would ultimately compete with.