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==Virtual Reality HMDs==
Tracker --> CPU --> GPU --> Display --> Photons --> Optics
===Features=======Large Field of View====
VR HMDs have displays with large [[field of view]] (FOV) that comprise the entirety of the user's vision. With both eyes, humans have about 180 degrees FOV. The display of a VR device should cover as much of the vision range as possible. A large FoV is important to create [[immersion]] for the wearer.
====Stereoscopic 3D Imagery====
The HMD has to create the illusion of a 3D world. To accomplish this, the display shows both of our eyes two different images of the same scene viewed from slightly different angles. This process creates depth perception by mimicking how our eyes perceive the world in real life.
====Rotational Tracking====
A key feature of an HMD is the ability to track the wearer's head rotations. The images shown on the display change according to the wearer's head movements. 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.
====Positional Tracking====
Positional Tracking is often performed with sensors and cameras external to the HMD. These peripherals can track the position of the user's head, body and hands anywhere within the range of the devices. They can not only track the rotational movements like the inboard sensors but also translational movements.
