Merge pull request #236 from cabanier/tracked-sources

Make tracked-sources optional

Author: cabanier

immersive-hands.html

@@ -43,6 +43,7 @@
         of cubes. Each cube represents a joint in your hand.
         <a class="back" href="./">Back</a>
       </p>
+      <label><input type='checkbox' id='trackedSources' checked> Request tracked-sources</label>
     </details>
   </header>
   <main style='text-align: center;'>
@@ -185,7 +186,11 @@
     // Called when the user selects a device to present to. In response we
     // will request an exclusive session from that device.
     function onRequestSession() {
-      return navigator.xr.requestSession(isAR?'immersive-ar':'immersive-vr', { optionalFeatures: ['local-floor', 'bounded-floor', 'hand-tracking'] }).then(onSessionStarted);
+      let optionalFeatures = ['local-floor', 'bounded-floor', 'hand-tracking'];
+      if (document.getElementById('trackedSources').checked) {
+        optionalFeatures.push('tracked-sources');
+      }
+      return navigator.xr.requestSession(isAR?'immersive-ar':'immersive-vr', { optionalFeatures }).then(onSessionStarted);
     }
 
     // Called when we've successfully acquired a XRSession. In response we