title: Kudan in Unity: how to stop or reset markerless tracking?
body: <p>I am creating an application with Kudan where a photograph (a 2D sprite) appears via markerless tracking. Based on the sample project I've successfully made adjustments so that the 2D plane is always perpendicular to the camera and placed on the screen in the position I want. Really wonderful! </p>
  
  <p>But I am unable to figure out how to restart/reset the tracking via a script. I can always force the tracking to restart by blocking the camera or shaking the phone, but I want to do it via a button-- it is exactly the same behavior I've found described in the "ArbiTrack Basics" guide for Android and iOS, but am unable to reproduce it in Unity. To what script should I send a stop tracking command in order to get the tracking instance to restart (exactly the same effect as blocking the camera when running one of the sample Unity projects in Markerless Mode).</p>
  
  <p>The situation is described here for Android coding: <a href="https://wiki.kudan.eu/ArbiTrack_Basics#Stopping_ArbiTrack" rel="nofollow">https://wiki.kudan.eu/ArbiTrack_Basics#Stopping_ArbiTrack</a></p>
  
  <p>where it says to call these three things:</p>
  
  <p>// Stop ArbiTrack
  arbiTrack.stop();</p>
  
  <p>// Display target node
  arbiTrack.getTargetNode().setVisible(true);</p>
  
  <p>//Change enum and label to reflect ArbiTrack state
  arbitrack_state = ARBITRACK_STATE.ARBI_PLACEMENT;</p>