Valve has been vocal in its support of virtual reality technology, saying that compelling, consumer-priced VR hardware could transform the entertainment industry. Valve says it has offered help to Oculus as it works on the Rift headset, but the Bellevue-based developer is also apparently working on its own virtual reality hardware. A poster on gaming super-forum NeoGAF says he was invited to see and use that prototype after it was shown to a few game developers at the recent Steam Dev Days conference. …