AbsoluteOrientationSensor

The AbsoluteOrientationSensor interface of the Sensor APIs describes the device's physical orientation in relation to the Earth's reference coordinate system.

To use this sensor, the user must grant permission to the 'accelerometer', 'gyroscope', and 'magnetometer' device sensors through the Permissions API.

If a feature policy blocks use of a feature it is because your code is inconsistent with the policies set on your server. This is not something that would ever be shown to a user. The Feature-Policy HTTP header article contains implementation instructions.

Constructor

AbsoluteOrientationSensor()

Creates a new AbsoluteOrientationSensor object.

Properties

No specific properties; inherits methods from its ancestors OrientationSensor and Sensor.

Event handlers

No specific event handlers; inherits methods from its ancestor, Sensor.

Methods

No specific methods; inherits methods from its ancestors OrientationSensor and Sensor.

Examples

Basic Example

The following example, which is loosely based on Intel's Orientation Phone demo, instantiates an AbsoluteOrientationSensor with a frequency of 60 times a second. On each reading it uses OrientationSensor.quaternion to rotate a visual model of a phone.

const options = { frequency: 60, referenceFrame: 'device' };
const sensor = new AbsoluteOrientationSensor(options);

sensor.addEventListener('reading', () => {
  // model is a Three.js object instantiated elsewhere.
  model.quaternion.fromArray(sensor.quaternion).inverse();
});
sensor.addEventListener('error', error => {
  if (event.error.name == 'NotReadableError') {
    console.log("Sensor is not available.");
  }
});
sensor.start();

Permissions Example

Using orientation sensors requires requesting permissions for multiple device sensors. Because the Permissions interface uses promises, a good way to request permissions is to use Promise.all.

const sensor = new AbsoluteOrientationSensor();
Promise.all([navigator.permissions.query({ name: "accelerometer" }),
             navigator.permissions.query({ name: "magnetometer" }),
             navigator.permissions.query({ name: "gyroscope" })])
       .then(results => {
         if (results.every(result => result.state === "granted")) {
           sensor.start();
           ...
         } else {
           console.log("No permissions to use AbsoluteOrientationSensor.");
         }
   });

Specifications

Browser compatibility