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VR is enabled by [[head-mounted display]]s (HMDs) such as the [[Oculus Rift]]. HMDs utilize [[stereoscopic displays]] and specialized [[lenses]] along with [[#Motion Tracking|motion tracking hardware]] to give the illusion that the user is physically inside the virtual world.  

VR is enabled by [[head-mounted display]]s (HMDs) such as the [[Oculus Rift]]. HMDs utilize [[stereoscopic displays]] and specialized [[lenses]] along with [[#Motion Tracking|motion tracking hardware]] to give the illusion that the user is physically inside the virtual world.  

The headset tracks the movement of your head and changes the images shown on the display based on it. This process creates the sensation that users are located within the virtual environment. Users of these devices are able to interact with the virtual environments. Various input methods, from the traditional game controllers and keyboards to the futuristic hand gestures and voice commands, are available or under development.

The headset tracks the movement of your head and changes the images shown on the display according to the movement. This process creates the sensation that users are located within the virtual environment. Users of these devices are able to interact with the virtual environments. Various input methods, from the traditional game controllers and keyboards to the futuristic hand gestures and voice commands, are available or under development.

===Position and rotation tracking===

===Position and rotation tracking===

A HMD tracks the movement of the user's head and updates the rendered scene based on the head's position and orientation. This process is similar to how we look around in real life. There are 2 classifications of tracking: [[rotational tracking]] and [[positional tracking|positional]].  

There are 2 classifications of tracking: [[rotational tracking]] and [[positional tracking|positional]].  

[[Rotational tracking]] tracks the 3 rotational movements: pitch, yaw, and roll. It is performed by [[IMUs]] such as [[accelerometer]]s, [[gyroscope]]s and [[magnetometer]]s.  

[[Rotational tracking]] tracks the 3 rotational movements: pitch, yaw, and roll. It is performed by [[IMUs]] such as [[accelerometer]]s, [[gyroscope]]s and [[magnetometer]]s.