Valve's Joe Ludwig on the uncertain future of virtual reality and partnering with Oculus

It's a beautiful late winter day in Bellevue, Wash. Instead of enjoying the outdoors, I'm sitting in a rectangular white room with four programmers, surrounded by three walls covered in augmented reality markers. Not that I'm complaining: Valve Software's Joe Ludwig, the programmer in the room who most resembles a member of Anthrax, is walking me through his company's latest work in the world of virtual reality. It's the first anyone outside of Valve will see of the company's VR efforts thus far...