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VRDisplay.cancelAnimationFrame()

This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The cancelAnimationFrame() method of the VRDisplay interface is a special implementation of Window.cancelAnimationFrame that unregisters callbacks registered with VRDisplay.requestAnimationFrame().

Syntax

vrDisplayInstance.cancelAnimationFrame(handle);

Parameters

handle
The handle returned by the VRDisplay.requestAnimationFrame() call that you want to unregister.

Return value

Void.

Examples

canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
drawScene();

// WebVR: Check to see if WebVR is supported
if(navigator.getVRDisplays) {
  console.log('WebVR 1.1 supported');
  // Then get the displays attached to the computer
  navigator.getVRDisplays().then(function(displays) {
    // If a display is available, use it to present the scene
    if(displays.length > 0) {
      vrDisplay = displays[0];
      console.log('Display found');
      // Starting the presentation when the button is clicked: It can only be called in response to a user gesture
      btn.addEventListener('click', function() {
        if(btn.textContent === 'Start VR display') {
          vrDisplay.requestPresent([{ source: canvas }]).then(function() {
            console.log('Presenting to WebVR display');

            // Set the canvas size to the size of the vrDisplay viewport

            var leftEye = vrDisplay.getEyeParameters('left');
            var rightEye = vrDisplay.getEyeParameters('right');

            canvas.width = Math.max(leftEye.renderWidth, rightEye.renderWidth) * 2;
            canvas.height = Math.max(leftEye.renderHeight, rightEye.renderHeight);

            // stop the normal presentation, and start the vr presentation
            window.cancelAnimationFrame(normalSceneFrame);
            drawVRScene();

            btn.textContent = 'Exit VR display';
          });
        } else {
          vrDisplay.exitPresent();
          console.log('Stopped presenting to WebVR display');

          btn.textContent = 'Start VR display';

          // Stop the VR presentation, and start the normal presentation
          vrDisplay.cancelAnimationFrame(vrSceneFrame);
          drawScene();
        }
      });
    }
  });
} else {
  info.textContent = 'WebVR API not supported by this browser.'
}

function drawVRScene() {
  // WebVR: Request the next frame of the animation
  vrSceneFrame = vrDisplay.requestAnimationFrame(drawVRScene);

  ...
}

Note: You can see this complete code at raw-webgl-example.

Specifications

Specification Status Comment
WebVR 1.1
The definition of 'cancelAnimationFrame()' in that specification.
Draft Initial definition

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support No15

555

606

No ? ?
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support No561 2 3 4 ? ? ? ?6.0

1. Only works in an experimental version of Chrome. (Other builds won't return any devices when Navigator.getVRDisplays() is invoked.)

2. Daydream View supported in Chrome 56.

3. Google Cardboard supported in Chrome 57.

4. From version 56: this feature is behind the WebVR preference. To change preferences in Chrome, visit chrome://flags.

5. Windows support was enabled in Firefox 55.

6. macOS support was enabled in Firefox 60.

See also

Document Tags and Contributors

Contributors to this page: fscholz, chrisdavidmills, abbycar
Last updated by: fscholz,