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In a Virtual Reality scenario the animation of the user's avatar contributes a lot to the feeling of immersion. Employing a full body motion capture solution can make the system unnecessarily complex and expensive, especially if precise motion animation is not crucial. Usually there is already a lot of motion data available from other sources, for example head position and rotation, movement speed, hip orientation,.... This could allow an estimation of the user's most probable pose and walking phase.
-) Oculus Rift HMD
-) Perception Neuron Motion Suit
-) Cyberith Virtualizer