title: ARKit image detection, add image
body: <p>I'm using ARKit 1.5 (beta) for image detection. Once I detect my image I would like to then place a AR scene image using the plane detected. How can this be done? </p>
  
  <p>My code so far which detects the image (which is in my assets folder):</p>
  
  <pre><code>/// - Tag: ARImageAnchor-Visualizing
  func renderer(_ renderer: SCNSceneRenderer, didAdd node: SCNNode, for anchor: ARAnchor) {
      guard let imageAnchor = anchor as? ARImageAnchor else { return }
      let referenceImage = imageAnchor.referenceImage
      updateQueue.async {
  
          // Create a plane to visualize the initial position of the detected image.
          let plane = SCNPlane(width: referenceImage.physicalSize.width,
                               height: referenceImage.physicalSize.height)
          let planeNode = SCNNode(geometry: plane)
          planeNode.opacity = 0.25
  
          /*
           `SCNPlane` is vertically oriented in its local coordinate space, but
           `ARImageAnchor` assumes the image is horizontal in its local space, so
           rotate the plane to match.
           */
          planeNode.eulerAngles.x = -.pi / 2
  
          /*
           Image anchors are not tracked after initial detection, so create an
           animation that limits the duration for which the plane visualization appears.
           */
          planeNode.runAction(self.imageHighlightAction)
  
          // Add the plane visualization to the scene.
          node.addChildNode(planeNode)
      }
  
      DispatchQueue.main.async {
          let imageName = referenceImage.name ?? ""
          self.statusViewController.cancelAllScheduledMessages()
          self.statusViewController.showMessage("Detected image “\(imageName)”")
      }
  }
  
  var imageHighlightAction: SCNAction {
      return .sequence([
          .wait(duration: 0.25),
          .fadeOpacity(to: 0.85, duration: 1.50),
          .fadeOpacity(to: 0.15, duration: 1.50),
          .fadeOpacity(to: 0.85, duration: 1.50),
          .fadeOut(duration: 0.75),
          .removeFromParentNode()
      ])
  </code></pre>