Question ARTrackedObjectsChangedEventArgs.removed not working

Code (CSharp):

1. private void OnEnable()
2.     {
3.         trackedObjectManager.trackedObjectsChanged += ObjectChanged;
4.     }
5.  
6.     private void OnDisable()
7.     {
8.         trackedObjectManager.trackedObjectsChanged -= ObjectChanged;
9.     }
10.  
11.     private void ObjectChanged(ARTrackedObjectsChangedEventArgs args)
12.     {
13.         foreach (ARTrackedObject trackedObject in args.added)
14.         {
15.             Debug.Log("args.added : " + trackedObject.name);
16.  
17.             if (!trackedObjectList.Contains(trackedObject))
18.             {
19.                 trackedObjectList.Add(trackedObject);
20.             }
21.         }
22.  
23.         foreach (ARTrackedObject trackedObject in args.updated)
24.         {
25.             Debug.Log("args.updated : " + trackedObject.name);
26.  
27.             if (!trackedObjectList.Contains(trackedObject))
28.             {
29.                 trackedObjectList.Add(trackedObject);
30.             }
31.  
32.             UpdateObject(trackedObject);
33.         }
34.  
35.         foreach (ARTrackedObject trackedObject in args.removed)
36.         {
37.             Debug.Log("args.removed : " + trackedObject.name);
38.  
39.             if (trackedObjectList.Contains(trackedObject))
40.             {
41.                 GameObject trackedObjectContent = prefabDictionary[trackedObject.referenceObject.name];
42.  
43.                 trackedObjectContent.SetActive(false);
44.                 trackedObjectList.Remove(trackedObject);
45.             }
46.         }
47.     }

I'm trying to disable it when tracking doesn't work.

args.removed

is not called.
So I'm trying to determine

trackedObject.trackingState == TrackingState.Limited

             || trackedObject.trackingState == TrackingState.None

, but that doesn't work either.
Any workaround? I think this problem is years old. I am waiting for it to be fixed.

 

How about putting that in a sample example? The basic functions available in Vuforia aren't working at all.

 

Code (CSharp):

1. using System.Collections.Generic;
2. using UnityEngine;
3. using UnityEngine.XR.ARFoundation;
4. using UnityEngine.XR.ARSubsystems;
5.  
6. public class MultiImageTracking : MonoBehaviour
7. {
8.     [SerializeField]
9.     private ARTrackedImageManager trackedImageManager;
10.  
11.     [SerializeField]
12.     private GameObject[] objectPool; // 트래킹 된 이미지 위에 배치할 오브젝트들
13.  
14.     private Dictionary<string, GameObject> objectDictionary = new Dictionary<string, GameObject>();
15.  
16.     private void Awake()
17.     {
18.         foreach (GameObject obj in objectPool)
19.         {
20.             objectDictionary.Add(obj.name, obj);
21.         }
22.     }
23.  
24.     private void OnEnable()
25.     {
26.         trackedImageManager.trackedImagesChanged += OnTrackedImagesChanged;
27.     }
28.  
29.     private void OnDisable()
30.     {
31.         trackedImageManager.trackedImagesChanged -= OnTrackedImagesChanged;
32.     }
33.  
34.     private void OnTrackedImagesChanged(ARTrackedImagesChangedEventArgs eventArgs)
35.     {
36.         foreach (var trackedImage in eventArgs.added)
37.         {
38.             UpdateObject(trackedImage);
39.         }
40.  
41.         foreach (var trackedImage in eventArgs.updated)
42.         {
43.             UpdateObject(trackedImage);
44.         }
45.  
46.         foreach (var trackedImage in eventArgs.removed)
47.         {
48.             if (objectDictionary.ContainsKey(trackedImage.referenceImage.name))
49.             {
50.                 objectDictionary[trackedImage.referenceImage.name].SetActive(false);
51.             }
52.         }
53.     }
54.  
55.     private void UpdateObject(ARTrackedImage trackedImage)
56.     {
57.  
58.         if (trackedImage.trackingState == TrackingState.Tracking)
59.         {
60.             if (objectDictionary.ContainsKey(trackedImage.referenceImage.name))
61.             {
62.                 objectDictionary[trackedImage.referenceImage.name].SetActive(true);
63.                 objectDictionary[trackedImage.referenceImage.name].transform.position = trackedImage.transform.position;
64.                 objectDictionary[trackedImage.referenceImage.name].transform.rotation = trackedImage.transform.rotation;
65.  
66.             }
67.         }
68.         else
69.         {
70.             if (objectDictionary.ContainsKey(trackedImage.referenceImage.name))
71.             {
72.                 objectDictionary[trackedImage.referenceImage.name].SetActive(false);
73.             }
74.         }
75.     }
76. }
77.  

This code works fine on android. I took out the inactive objects in the scene beforehand.

 

Thank you for your kind reply.