Difference between revisions of "Positional tracking"

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Acoustic tracking can be influenced by surrounding noise causing inaccurate measurements. It also demands careful calibration and does not provide high update rates. Even with its faults, acoustic tracking can be used injunction with other methods to improve positional tracking.
 
Acoustic tracking can be influenced by surrounding noise causing inaccurate measurements. It also demands careful calibration and does not provide high update rates. Even with its faults, acoustic tracking can be used injunction with other methods to improve positional tracking.
 
===Inertial===
 
===Inertial===
 +
Inertial tracking determines the linear acceleration of the object. In most [[HMD]]s and smartphones, inertial tracking is performed by [[accelerometer]]s and [[gyroscope]]s.
  
 
===Magnetic===
 
===Magnetic===

Revision as of 07:25, 12 April 2015

Positional tracking tracks the absolute position of the HMD, hands and other devices and body parts within the 3 dimensional space. Positional tracking records the translational movements, left/right, forward/backward and up/down, of your device. Precise and low latency positional tracking is essential to have a good VR experience and produce presence.

By contrast, rotational tracking, records the rotational movements of your HMD, such as turning and tiling of your head.

Methods

Acoustic

Acoustic tracking measures the length of time of an acoustic signal takes to reach various receivers.

Acoustic tracking can be influenced by surrounding noise causing inaccurate measurements. It also demands careful calibration and does not provide high update rates. Even with its faults, acoustic tracking can be used injunction with other methods to improve positional tracking.

Inertial

Inertial tracking determines the linear acceleration of the object. In most HMDs and smartphones, inertial tracking is performed by accelerometers and gyroscopes.

Magnetic

Magnetic tracking determines the strength of the magnetic field in different directions.

Magnetic tracking is utilized in Razer Hydra. It is usually a very accurate tracking method, although it can be influenced by magnetic fields generated by other electronics and objects near the sensor or emitter.

Most HMDs and smartphones contain magnetometers, IMUs that detect the magnetic field of Earth.

Optic