And they have done a pretty good job at it. Using an Oculus Rift, a 3D motion tracking system, and modern computing power they have created an impressive virtual environment. Their system seems to be the best one yet, with an impressive response time as well as the classic holodeck feature, fooling you that a small room is enormous. You can walk through this environment for days without realizing that you are actually walking in circles.
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For the time being, the Omni + Rift combo might be the best thing for consumers aching for a holodeck.