Accelerometer

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A device that measures changes in gravitational acceleration in a device it may be installed in

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Aspect Ratio

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The relationship between the width and height of an image.

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Asynchronous Time Warp (ATW)

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A technique that generates intermediate frames in situations when the game can’t maintain frame rate, helping to reduce judder. However, ATW is not a silver bullet and has limitations that developers should be aware of.

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Eye Tracking

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A technology that monitors eye movements or the process of measuring eye movement.

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Field of View (FOV)

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The extent of the observable environment at any given time

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Gyroscope

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A device that can be used to calculate orientation either to help you stick to a particular orientation

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Head Mounted Display (HMD)

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A technology that enables the VR software to determine where the users head is in a predefined space

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Head Tracking

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A technology that enables the VR software to determine where the users head is in a predefined space

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Interpupillary Distance (IPD)

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The measurement of the distance between the centers of one's eyes

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Latency

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The delay or waiting that increases real or perceived response time beyond what is desired

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Locomotion

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The method of navigating in virtual spaces.

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Metaverse

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A virtual-reality space in which users can interact with a computer-generated environment and other users.

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Motion to Photon Latency

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The time needed for a user movement to be fully reflected on a display screen

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Outside-in Positional Tracking

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Optical Tracking where the camera is placed in a stationary location

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Positional Tracking

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Device spec that registers the exact position of the headset in space by recognizing movement

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Refresh Rate

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The number of frames per second that a device can display

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Six Degrees of Freedom (6DOF)

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The freedom of movement of a rigid body in three-dimensional space. The number of degrees of freedom is equal to the total number of independent displacements or aspects of motion

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Stitching

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The process of collecting footage from cameras and then arranging them into a single image.

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WebVR

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An experimental Javascript API that provides access to Virtual Reality devices, such as the HTC Vive, Oculus Rift or Google Cardboard, in a web browser

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