VREyeParameters
===============

**Deprecated:** This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.

**Non-standard:** This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

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.

**Note:** This interface was part of the old WebVR API. It has been superseded by the WebXR Device API.

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

**Warning:** The values in this interface should not be used to compute view or projection matrices. In order to ensure the widest possible hardware compatibility use the matrices provided by `VRFrameData`.

Instance properties
-------------------

`VREyeParameters.offset` 
Deprecated
 Read only  
Non-standard

Represents the offset from the center point between the user's eyes to the center of the eye, measured in meters.

`VREyeParameters.fieldOfView` 
Deprecated
 Read only  
Non-standard

Describes the current field of view for the eye, which can vary as the user adjusts their interpupillary distance (IPD).

`VREyeParameters.renderWidth` 
Deprecated
 Read only  
Non-standard

Describes the recommended render target width of each eye viewport, in pixels.

`VREyeParameters.renderHeight` 
Deprecated
 Read only  
Non-standard

Describes the recommended render target height of each eye viewport, in pixels.

Examples
--------


```js
navigator.getVRDisplays().then((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", () => {
    vrDisplay.requestPresent([{ source: canvas }]).then(() => {
      console.log("Presenting to WebVR display");

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

      const leftEye = vrDisplay.getEyeParameters("left");
      const rightEye = vrDisplay.getEyeParameters("right");

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

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

Specifications
--------------

This interface was part of the old WebVR API that has been superseded by the WebXR Device API. It is no longer on track to becoming a standard.

Until all browsers have implemented the new WebXR APIs, it is recommended to rely on frameworks, like A-Frame, Babylon.js, or Three.js, or a polyfill, to develop WebXR applications that will work across all browsers [1].

Browser compatibility
---------------------

BCD tables only load in the browser with JavaScript enabled. Enable JavaScript to view data.

See also
--------

* WebVR API