VREyeParameters

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This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.

The VREyeParameters interface of the WebVR API represents all the information required to correctly render a scene for a given eye, including field of view information.

This interface is accessible through the VRDisplay.getEyeParameters() method.

Properties

VREyeParameters.offset  Read only
Represents the offset from the center point between the user's eyes to the center of the eye, measured in meters.
VREyeParameters.fieldOfView Read only
Describes the current field of view for the eye, which can vary as the user adjusts their interpupillary distance (IPD).
VREyeParameters.renderWidth Read only
Describes the recommended render target width of each eye viewport, in pixels.
VREyeParameters.renderHeight Read only
Describes the recommended render target height of each eye viewport, 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 'VREyeParameters' in that specification.		 Editor's Draft Initial definition

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
fieldOfView (Yes)1 2 (Yes)553 No ? ?
maximumFieldOfView No No No No ? ?
minimumFieldOfView No No No No ? ?
offset (Yes)1 2 (Yes)553 No ? ?
recommendedFieldOfView No No No No ? ?
renderHeight (Yes)1 2 (Yes)553 No ? ?
renderRect No No No No ? ?
renderWidth (Yes)1 2 (Yes)553 No ? ?
FeatureAndroidChrome for AndroidEdge mobileFirefox for AndroidIE mobileOpera AndroidiOS Safari
fieldOfView No (Yes)4 ? ? No ? ?
maximumFieldOfView No No No ? No ? ?
minimumFieldOfView No No No ? No ? ?
offset No (Yes)4 ? ? No ? ?
recommendedFieldOfView No No No ? No ? ?
renderHeight No (Yes)4 ? ? No ? ?
renderRect No No No ? No ? ?
renderWidth No (Yes)4 ? ? No ? ?

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

2. , this feature is behind the WebVR preference. To change preferences in Chrome, visit chrome://flags.

3. Currently only Windows support is enabled by default. Mac support is available in Firefox Nightly.

4. Currently supported only by Google Daydream.

See also

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