Changes

A key feature of an HMD is the ability to track the wearer's head rotations. The images shown on the display change based on the wearer's head movementmovements. Head-tracking is an essential aspect of the HMD that allows the user to become immersed and feel [[presence]].  Rotational Tracking is achieved through sensors such as the [[Gyroscope]], [[Accelerometer]] and [[Magnetometer]] within the HMD.