Image TrackingState.Paused does not instantly work

[dv-dt-spal]

SPECIFIC ISSUE ENCOUNTERED

TrackingState.Paused is very slow and the 3D asset created lingers even when image is not in view

VERSIONS USED

• Unity: 2018.2.18f1
• ARCore SDK for Unity: arcore-unity-sdk-v1.5.0
• Device manufacturer, model, and O/S: Samsung Note 8 and Samsung Tab S3
• ARCore:
  On Windows, use: adb shell pm dump com.google.ar.core | findstr /i "packages: versionName"
  On macOS, use: adb shell pm dump com.google.ar.core | egrep -i versionName\|packages:
• Output of adb shell getprop ro.build.fingerprint:

STEPS TO REPRODUCE THE ISSUE

1. In the augmented image example destroy the associate gameobject with both paused and stopped state
   ` foreach (var image in m_TempAugmentedImages)
   {
   AugmentedImageVisualizer visualizer = null;
   m_Visualizers.TryGetValue(image.DatabaseIndex, out visualizer);
   if (image.TrackingState == TrackingState.Tracking && visualizer == null)
   {
   // Create an anchor to ensure that ARCore keeps tracking this augmented image.
   Anchor anchor = image.CreateAnchor(image.CenterPose);
   if(image.DatabaseIndex == 0)
   visualizer = (AugmentedImageVisualizer)Instantiate(AugmentedImageVisualizerPrefab, anchor.transform);
   else if(image.DatabaseIndex == 1)
   visualizer = (AugmentedImageVisualizer)Instantiate(AugmentedImageVisualizerPrefab2, anchor.transform);
   //else
   // visualizer = (AugmentedImageVisualizer)Instantiate(AugmentedImageVisualizerPrefab3, anchor.transform);

   			visualizer.Image = image;
   
   			m_Visualizers.Add(image.DatabaseIndex, visualizer);
   		}
   		else if (image.TrackingState == TrackingState.Stopped && visualizer != null)
   		{
   			m_Visualizers.Remove(image.DatabaseIndex);
   			GameObject.DestroyImmediate(visualizer.gameObject);
   		}
   		else if (image.TrackingState == TrackingState.Paused && visualizer != null)
   		{
   			m_Visualizers.Remove(image.DatabaseIndex);
   			GameObject.DestroyImmediate(visualizer.gameObject);
   		}
   	}`
   

WORKAROUNDS (IF ANY)

No

ADDITIONAL COMMENTS

Any workaround to instantly know if the image is not being tracked by ARCore and destroy the marker associated gameobject?

[fredsa]

Duplicate of #299