Revision 1029724 of VRFieldOfViewReadOnly

<div>{{APIRef("WebVR API")}}{{SeeCompatTable}}</div>

<p>The <strong><code>VRFieldOfViewReadOnly</code></strong> interface of the <a href="/en-US/docs/Web/API/WebVR_API">WebVR API</a> contains the raw definition for the degree value properties required to define a field of view. Inherited by {{domxref("VRFieldOfView")}}.</p>

<h2 id="Properties">Properties</h2>

<dl>
 <dt>{{domxref("VRFieldOfViewReadOnly.upDegrees")}} {{readonlyInline}}</dt>
 <dd>The number of degrees upward that the field of view extends.</dd>
 <dt>{{domxref("VRFieldOfViewReadOnly.rightDegrees")}} {{readonlyInline}}</dt>
 <dd>The number of degrees to the right that the field of view extends.</dd>
 <dt>{{domxref("VRFieldOfViewReadOnly.downDegrees")}} {{readonlyInline}}</dt>
 <dd>The number of degrees downwards that the field of view extends.</dd>
 <dt>{{domxref("VRFieldOfViewReadOnly.leftDegrees")}} {{readonlyInline}}</dt>
 <dd>The number of degrees to the left that the field of view extends.</dd>
</dl>

<h2 id="Examples">Examples</h2>

<p>You wouldn't ever use this object directly; for some useful examples see the {{domxref("VRFieldOfView")}} page.</p>

<p>To access the properties directly, you could do something like this:</p>

<pre class="brush: js">
var lEye = myHMDVRDevice.getEyeParameters('left');

lEye.recommendedFieldOfView.upDegrees
// returns something like 53.09438550469889
lEye.recommendedFieldOfView.rightDegrees
// returns something like 47.52769258067174
lEye.recommendedFieldOfView.downDegrees
// returns something like 53.09438550469889
lEye.recommendedFieldOfView.leftDegrees
// returns something like 46.63209579904155</pre>

<h2 id="Specifications">Specifications</h2>

<table class="standard-table">
 <tbody>
  <tr>
   <th scope="col">Specification</th>
   <th scope="col">Status</th>
   <th scope="col">Comment</th>
  </tr>
  <tr>
   <td>{{SpecName('WebVR','#vrfieldofviewreadonly','VRFieldOfViewReadOnly')}}</td>
   <td>{{Spec2('WebVR')}}</td>
   <td>Initial definition</td>
  </tr>
 </tbody>
</table>

<h2 id="Browser_compatibility">Browser compatibility</h2>

<p>{{CompatibilityTable}}</p>

<div id="compat-desktop">
<table class="compat-table">
 <tbody>
  <tr>
   <th>Feature</th>
   <th>Chrome</th>
   <th>Firefox (Gecko)</th>
   <th>Internet Explorer</th>
   <th>Opera</th>
   <th>Safari (WebKit)</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>{{CompatVersionUnknown}}<sup>[1]</sup></td>
   <td>{{CompatGeckoDesktop(39)}}<sup>[2]</sup></td>
   <td>{{CompatNo}}</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatNo}}</td>
  </tr>
 </tbody>
</table>
</div>

<div id="compat-mobile">
<table class="compat-table">
 <tbody>
  <tr>
   <th>Feature</th>
   <th>Android</th>
   <th>Firefox Mobile (Gecko)</th>
   <th>Firefox OS (Gecko)</th>
   <th>IE Phone</th>
   <th>Opera Mobile</th>
   <th>Safari Mobile</th>
   <th>Chrome for Android</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatGeckoMobile(39)}}<sup>[2]</sup><br />
    {{CompatGeckoMobile(44)}}<sup>[3]</sup></td>
   <td>{{CompatNo}}</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatNo}}</td>
  </tr>
 </tbody>
</table>
</div>

<ul>
 <li>[1] The support in Chrome is currently experimental. To find information on Chrome's WebVR implementation status including supporting builds, check out <a href="https://blog.tojicode.com/2014/07/bringing-vr-to-chrome.html">Bringing VR to Chrome</a> by Brandon Jones.</li>
 <li>[2] The support for this feature is currently disabled by default in Firefox. To enable WebVR support in Firefox Nightly/Developer Edition, you can go to <code>about:config</code> and enable the <code>dom.vr*</code> prefs. A better option however is to install the <a href="https://www.mozvr.com/downloads/webvr-addon-0.1.0.xpi">WebVR Enabler Add-on</a>, which does this for you and sets up other necessary parts of the <a href="/en-US/docs/Web/API/WebVR_API/WebVR_environment_setup">environment</a>.</li>
 <li>[3] The <code>dom.vr*</code> prefs are enabled by default at this point, in Nightly/Aurora editions.</li>
</ul>

<h2 id="See_also">See also</h2>

<ul>
 <li><a href="/en-US/docs/Web/API/WebVR_API">WebVR API homepage</a>.</li>
 <li><a href="https://mozvr.com/">MozVr.com</a> — demos, downloads, and other resources from the Mozilla VR team.</li>
</ul>