simplified logic

Assets/Scenes/ImageTracking/Multi Prefab - Image Tracking/MultiTrackedImageInfoManager.cs

         List<NamedPrefab> m_PrefabsList = new List<NamedPrefab>();
 
         Dictionary<Guid, GameObject> m_PrefabsDictionary = new Dictionary<Guid, GameObject>();
-        Dictionary<Guid, GameObject> m_InstantiatedPrefabsDictionary = new Dictionary<Guid, GameObject>();
+        Dictionary<Guid, GameObject> m_Instantiated = new Dictionary<Guid, GameObject>();
         ARTrackedImageManager m_TrackedImageManager;
 
         [SerializeField]
                 // Give the initial image a reasonable default scale
                 var minLocalScalar = Mathf.Min(trackedImage.size.x, trackedImage.size.y) / 2;
                 trackedImage.transform.localScale = new Vector3(minLocalScalar, minLocalScalar, minLocalScalar);
-                AssignOrShowPrefab(trackedImage);
-            }
-
-            foreach (var trackedImage in eventArgs.updated)
-            {
-                if (trackedImage.trackingState != TrackingState.Tracking)
-                {
-                    if (m_InstantiatedPrefabsDictionary.TryGetValue(trackedImage.referenceImage.guid, out GameObject instantiatedPrefab))
-                        instantiatedPrefab.SetActive(false);
-                }
-                else
-                    AssignOrShowPrefab(trackedImage);
+                AssignPrefab(trackedImage);
-        void AssignOrShowPrefab(ARTrackedImage trackedImage)
+        void AssignPrefab(ARTrackedImage trackedImage)
-            {
-                if (!m_InstantiatedPrefabsDictionary.ContainsKey(trackedImage.referenceImage.guid))
-                {
-                    var instantiatedPrefab = Instantiate(prefab, trackedImage.transform);
-                    m_InstantiatedPrefabsDictionary.Add(trackedImage.referenceImage.guid, instantiatedPrefab);
-                }
-                else
-                {
-                    var instantiatedPrefab = m_InstantiatedPrefabsDictionary[trackedImage.referenceImage.guid];
-                    instantiatedPrefab.SetActive(true);
-                }
-            }
+                m_Instantiated.Add(trackedImage.referenceImage.guid, Instantiate(prefab, trackedImage.transform));
         }
 
         public GameObject GetPrefabForReferenceImage(XRReferenceImage referenceImage)
         {
-            if (m_PrefabsDictionary.TryGetValue(referenceImage.guid, out GameObject targetPrefabInDictionary))
+            m_PrefabsDictionary[referenceImage.guid] = alternativePrefab;
+            if (m_Instantiated.TryGetValue(referenceImage.guid, out GameObject instantiatedPrefab))
-                m_PrefabsDictionary[referenceImage.guid] = alternativePrefab;
-                if (m_InstantiatedPrefabsDictionary.TryGetValue(referenceImage.guid, out GameObject instantiatedPrefab))
-                {
-                    Destroy(instantiatedPrefab);
-                    m_InstantiatedPrefabsDictionary.Remove(referenceImage.guid);
-                }
+                m_Instantiated[referenceImage.guid] = Instantiate(alternativePrefab, instantiatedPrefab.transform.parent);
+                Destroy(instantiatedPrefab);
             }
         }
 

ProjectSettings/ProjectSettings.asset

     Others: 1
   bundleVersion: 0.1
   preloadedAssets:
-  - {fileID: 4800000, guid: e7c77f6eaab324a819efdc13b8125a39, type: 3}
-  - {fileID: -7479341934665344595, guid: e2f869774b12e400996eb546603602e3, type: 2}
+  - {fileID: -6122771651556369562, guid: e2f869774b12e400996eb546603602e3, type: 2}
+  - {fileID: 4800000, guid: c9f956787b1d945e7b36e0516201fc76, type: 3}
   metroInputSource: 0
   wsaTransparentSwapchain: 0
   m_HolographicPauseOnTrackingLoss: 1