Engine API Reference - v2.6.1
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    Class XrLightEstimation

    Light Estimation provides illumination data from the real world, which is estimated by the underlying AR system. It provides a reflection Cube Map, that represents the reflection estimation from the viewer position. A more simplified approximation of light is provided by L2 Spherical Harmonics data. And the most simple level of light estimation is the most prominent directional light, its rotation, intensity and color.

    Hierarchy (View Summary)

    Index

    Accessors

    available color intensity rotation sphericalHarmonics supported

    Methods

    end fire hasEvent off on once start

    Events

    EVENT_AVAILABLE EVENT_ERROR

    Accessors

    • get available(): boolean

      True if estimated light information is available.

      Returns boolean

      if (app.xr.lightEstimation.available) {
          entity.light.intensity = app.xr.lightEstimation.intensity;
      }
    • get intensity(): null | number

      Intensity of what is estimated to be the most prominent directional light. Or null if data is not available.

      Returns null | number

    Methods

    • Fire an event, all additional arguments are passed on to the event listener.

      Parameters

      • name: string

        Name of event to fire.

      • Optionalarg1: any

        First argument that is passed to the event handler.

      • Optionalarg2: any

        Second argument that is passed to the event handler.

      • Optionalarg3: any

        Third argument that is passed to the event handler.

      • Optionalarg4: any

        Fourth argument that is passed to the event handler.

      • Optionalarg5: any

        Fifth argument that is passed to the event handler.

      • Optionalarg6: any

        Sixth argument that is passed to the event handler.

      • Optionalarg7: any

        Seventh argument that is passed to the event handler.

      • Optionalarg8: any

        Eighth argument that is passed to the event handler.

      Returns EventHandler

      Self for chaining.

      obj.fire('test', 'This is the message');

    • Test if there are any handlers bound to an event name.

      Parameters

      • name: string

        The name of the event to test.

      Returns boolean

      True if the object has handlers bound to the specified event name.

      obj.on('test', () => {}); // bind an event to 'test'
      obj.hasEvent('test'); // returns true
      obj.hasEvent('hello'); // returns false

    • Detach an event handler from an event. If callback is not provided then all callbacks are unbound from the event, if scope is not provided then all events with the callback will be unbound.

      Parameters

      • Optionalname: string

        Name of the event to unbind.

      • Optionalcallback: HandleEventCallback

        Function to be unbound.

      • Optionalscope: any

        Scope that was used as the this when the event is fired.

      Returns EventHandler

      Self for chaining.

      const handler = () => {};
      obj.on('test', handler);

      obj.off(); // Removes all events
      obj.off('test'); // Removes all events called 'test'
      obj.off('test', handler); // Removes all handler functions, called 'test'
      obj.off('test', handler, this); // Removes all handler functions, called 'test' with scope this

    • Attach an event handler to an event.

      Parameters

      • name: string

        Name of the event to bind the callback to.

      • callback: HandleEventCallback

        Function that is called when event is fired. Note the callback is limited to 8 arguments.

      • Optionalscope: any = ...

        Object to use as 'this' when the event is fired, defaults to current this.

      Returns EventHandle

      Can be used for removing event in the future.

      obj.on('test', (a, b) => {
          console.log(a + b);
      });
      obj.fire('test', 1, 2); // prints 3 to the console

      const evt = obj.on('test', (a, b) => {
          console.log(a + b);
      });
      // some time later
      evt.off();

    • Attach an event handler to an event. This handler will be removed after being fired once.

      Parameters

      • name: string

        Name of the event to bind the callback to.

      • callback: HandleEventCallback

        Function that is called when event is fired. Note the callback is limited to 8 arguments.

      • Optionalscope: any = ...

        Object to use as 'this' when the event is fired, defaults to current this.

      Returns EventHandle

      • can be used for removing event in the future.
      obj.once('test', (a, b) => {
          console.log(a + b);
      });
      obj.fire('test', 1, 2); // prints 3 to the console
      obj.fire('test', 1, 2); // not going to get handled

    • Start estimation of illumination data. Availability of such data will come later and an available event will be fired. If it failed to start estimation, an error event will be fired.

      Returns void

      app.xr.on('start', () => {
          if (app.xr.lightEstimation.supported) {
              app.xr.lightEstimation.start();
          }
      });

    Events

    EVENT_AVAILABLE: string = 'available'

    Fired when light estimation data becomes available.

    app.xr.lightEstimation.on('available', () => {
        console.log('Light estimation is available');
    });
    EVENT_ERROR: string = 'error'

    Fired when light estimation has failed to start. The handler is passed the Error object related to failure of light estimation start.

    app.xr.lightEstimation.on('error', (error) => {
        console.error(error.message);
    });

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