VRFieldOfView
=============

**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 **`VRFieldOfView`** interface of the WebVR API represents a field of view defined by 4 different degree values describing the view from a center point.

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 It has been superseded by the WebXR Device API.

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

`VRFieldOfView.upDegrees` 
Deprecated
 Read only  
Non-standard

The number of degrees upwards that the field of view extends in.

`VRFieldOfView.rightDegrees` 
Deprecated
 Read only  
Non-standard

The number of degrees to the right that the field of view extends in.

`VRFieldOfView.downDegrees` 
Deprecated
 Read only  
Non-standard

The number of degrees downwards that the field of view extends in.

`VRFieldOfView.leftDegrees` 
Deprecated
 Read only  
Non-standard

The number of degrees to the left that the field of view extends in.

Examples
--------


```js
const info = document.querySelector("p");
const list = document.querySelector("ul");
let vrDisplay;

if (navigator.getVRDisplays) {
  reportFieldOfView();
} else {
  info.textContent = "WebVR API not supported by this browser.";
}

function reportFieldOfView() {
  navigator.getVRDisplays().then((displays) => {
    vrDisplay = displays[0];
    const lEye = vrDisplay.getEyeParameters("left");
    const rEye = vrDisplay.getEyeParameters("right");
    // lEye and rEye are VREyeParameters objects

    const lFOV = lEye.fieldOfView;
    const rFOV = rEye.fieldOfView;
    // lFOV and rFOV are VRFieldOfView objects

    const listitem1 = document.createElement("li");
    const listitem2 = document.createElement("li");

    listitem1.innerHTML =
      `<strong>Left eye parameters</strong><br>` +
      `Offset: ${lEye.offset}<br>` +
      `Render width: ${lEye.renderWidth}<br>` +
      `Render height: ${lEye.renderHeight}<br>` +
      `Up degrees: ${lFOV.upDegrees}<br>` +
      `Right degrees: ${lFOV.rightDegrees}<br>` +
      `Down degrees: ${lFOV.downDegrees}<br>` +
      `Left degrees: ${lFOV.leftDegrees}`;

    listitem2.innerHTML =
      `<strong>Right eye parameters</strong><br>` +
      `Offset: ${rEye.offset}<br>` +
      `Render width: ${rEye.renderWidth}<br>` +
      `Render height: ${rEye.renderHeight}<br>` +
      `Up degrees: ${rFOV.upDegrees}<br>` +
      `Right degrees: ${rFOV.rightDegrees}<br>` +
      `Down degrees: ${rFOV.downDegrees}<br>` +
      `Left degrees: ${rFOV.leftDegrees}`;

    list.appendChild(listitem1);
    list.appendChild(listitem2);
  });
}
```

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