On a soundstage no bigger than a large bedroom a cameraman takes up various angles to film a helicopter that isn't there, landing in a field that isn't there either. Until recently, virtual reality was the preserve of the gaming crowd but producers say the technology is on the cusp of a boom which could change forever the way television is made. Leading the charge is visual effects studio CBS Digital, which has developed "Parallax," a VR system which could potentially do away with on-location filming altogether.



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