VREyeParameters.renderWidth

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

The renderWidth read-only property of the VREyeParameters interface describes the recommended render target width of each eye viewport, in pixels.

This is already in device pixel units, so there's no need to multiply by Window.devicePixelRatio before setting to HTMLCanvasElement.width.

Syntax

var myRenderWidth = eyeParametersInstance.renderWidth;

Value

A number, representing the width in pixels.

Examples

navigator.getVRDisplays().then(function(displays) {
  // If a display is available, use it to present the scene
  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() {
    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);

      drawVRScene();
    });
  });
});

Specifications

Specification Status Comment
WebVR 1.1
The definition of 'renderWidth' in that specification.
Draft Initial definition

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support No15

555

636

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 63.

See also

Document Tags and Contributors

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