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===Requirements for Presence===
===Requirements for Presence===
====Tracking====  
====Tracking====  
*6 [[degrees of freedom]]: ability to track user's head in rotational and translational movements.
*6 [[degrees of freedom]] - ability to track user's head in rotational and translational movements.


*360 degrees tracking: track user's head independent of the direction the user is facing.
*360 degrees tracking - track user's head independent of the direction the user is facing.


*sub-millimeter
*Sub-millimeter accuracy - tracking accuracy of less than a millimeter.


*no jitter
*No jitter - no shaking, image on the display has to stay perfectly still.


*comfortable tracking volume.<ref name="OC2014 Iribe">Oculus Connect 2014: Brendan Iribe Keynote</ref>
*Comfortable tracking volume - large enough space to move around and still be tracked.<ref name="OC2014 Iribe">Oculus Connect 2014: Brendan Iribe Keynote</ref>


====Latency====  
====Latency====