title: ARKit image detected reappear
body: <p>I'm currently using ARKit 2.0 (beta) to do some image recognition, and I am struggling with one thing.
  When I detect my image I put an object beside it (doesn't matter what object it's just a node with a material based on the image I've found).</p>
  
  <p>My question is: Is there an ARKit function trigerred when the image found reappear (so the node associted with the imageanchor too) ? I'm searching right know but I don't find anything good</p>