title: does ARKit exposes an automatic way of displaying ground planes, or should it be added as an object to some coordinates
body: <p>I am trying to display ground plane using ARKit, and I see that for <code>ARSCNView</code> exposes two options: <code>showWorldOrigin</code> and <code>showFeaturePoints</code> so that when they are "on", the world coordinate and feature points are displayed with no additional code.</p>
  
  <p>Is there such a hook for ground plane as well? I see that if I do:</p>
  
  <pre><code>        let config = ARWorldTrackingConfiguration()
          config.planeDetection = WorldTrackingSessionConfiguration.PlaneDetection.horizontal 
  </code></pre>
  
  <p>then presumably ground plane is being detected, and I would like two things:</p>
  
  <ol>
  <li><p>a console printout for the coordinates of the ground plane</p></li>
  <li><p>an in-camera display of groundplane</p></li>
  </ol>
  
  <p>Are there pre-exposed options for such tasks, or do they have to be implemented? If so what are some tutorials that goes over such tasks?</p>