Motion Tracking
HMD tracks the movement of your head and updates the rendered scene based on its orientation and location. This process is similar to how we look around in real life. There are 2 types of tracking: rotational tracking and positional.
Rotational tracking tracks the 3 rotational movements: pitch, yaw, and roll. It is performed by IMUs such as accelerometers, gyroscopes and magnetometers.
Positional tracking tracks the 3 translational movements: forward/back, up/down and left/right. Positional tracking is usually more difficult than rotational tracking and is accomplished through different Types and Systems.
Motion tracking is not only used to track your head in HMDs but also used to track your hands and rest of your body through various input devices.
