title: How to start using rajawali vr
body: <p>I'm using Android Studio. I want to use Rajawali library, especially the vr package. I add the following line to build.gradle as described in GitHub.</p>
  
  <pre><code>compile 'org.rajawali3d:rajawali:1.0.325@aar'
  </code></pre>
  
  <p>Then I am able to use some classes in Rajawali library, such as <code>RajawaliRenderer</code>. But when I import package <code>org.rajawali3d.vr</code>, Android Studio says " Cannot resolve symbol 'vr' ". What am I doing wrong? How to fix it?</p>