title: OnDrawFrame function getting called only once Vuforia AR issue
body: <p>I am using Vuforia to build an AR App but when I add:</p>
  <pre><code>&lt;meta-data android:name=&quot;com.google.ar.core&quot; android:value=&quot;optional&quot; /&gt;
  </code></pre>
  <p>in AndroidManifest.xml file, the camera gets stuck and <code>OnDrawFrame</code> gets called only once.
  And when I add this tag then I get  a smart terrain initialization error for ground plane while <code>OnDrawFrame</code> works fine.</p>