The VR works on three major steps-
- Head Tracking
- Eye Tracking
- Motion Tracking
In this post, we will see in deatiled about Head Tracking.
Head Tracking in VR explained-VR head tracking-
Head tracking means that when you wear a VR headset, the image in front of you changes as you look up, down and sideways or in the corner of your head. A system called 6DoF (six degrees of freedom) aligns your head according to your X, Y and Z axis to measure the movement of the head forward and backward, side to side and shoulder to shoulder, another called pitch, yaw and roll.
There are a few different internal devices that can be used in the head tracking system, such as a gyroscope, accelerometer and magnetometer. Sony's PSVR also uses nine LEDs surrounded by headsets to provide a 360 degree head tracking on an external camera that monitors these signals, while the Oculus has 20 not as bright lights.
Head tracking technology requires low latency to work - we're talking about 50 milliseconds or less or we'll see what's left between turning the head and when the VR environment changes. The Oculus Rift has a reduced lag of just 30ms. The Lag can also be a problem for any movement tracking installation, such as the PS Move style controls that measure our hand and arm movements.
Finally, headphones can be used to enhance the concept of immersion. Binaural or 3D audio can be used by app developers and game developers to tap into VR head tracking technology to take advantage of this and give the user the impression that the sound is coming from behind, next to them or away.
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