Bug No Image names from Image Library

Hi,

I am trying to test out some features and I am struggling to find an answer online so I am asking for some suggestions or guidance if possible.

I have followed a few tutorials to implement multi image tracking without using Vuforia.

When trying to link the names of the images to the name of the Prefabs I come unstuck.

It is looking like for each tracked image, the trackedimage.referenceImage.name is null.

I have hardcoded the order of the models and it worked (some prefabs work, some don't, this is for another day) but when I try to link prefabs name and image name I am coming unstuck.

Can anyone help or maybe suggest another way I can link different images to different prefabs?

Code (CSharp):

1. using System.Collections;
2. using System.Linq;
3. using System.Collections.Generic;
4. using UnityEngine;
5. using UnityEngine.XR.ARFoundation;
6. using UnityEngine.XR.ARSubsystems;
7.  
8. [RequireComponent(typeof(ARTrackedImageManager))]
9. public class ImageTracking : MonoBehaviour
10. {
11.     // Reference to AR Tracked Image Manager Component
12.     private ARTrackedImageManager _trackedImageManager;
13.  
14.     // List of prefabs to instantiate
15.     public GameObject[] ArPreFabs;
16.  
17.     // Keep dictionary Array of created prefabs
18.     private readonly Dictionary<string, GameObject> _instantiatedPrefabs = new Dictionary<string, GameObject>();
19.  
20.     // Testing
21.     //int num = 0;
22.  
23.     private void Awake()
24.     {
25.         // Cache a reference to tracked image manager
26.         _trackedImageManager = GetComponent<ARTrackedImageManager>();
27.  
28.         Debug.Log("Tracked image Manager has this many images : " + _trackedImageManager.referenceLibrary.count);
29.  
30.     }
31.  
32.  
33.     private void OnEnable()
34.     {
35.         _trackedImageManager.trackedImagesChanged += OnTrackedImageChanged;
36.     }
37.  
38.     private void OnDisable()
39.     {
40.         _trackedImageManager.trackedImagesChanged -= OnTrackedImageChanged;
41.     }
42.  
43.  
44.     // Event Handler
45.     private void OnTrackedImageChanged(ARTrackedImagesChangedEventArgs eventsArg)
46.     {
47.         // Loop through all new tracked images that have been detected
48.         foreach (var trackedimage in eventsArg.added)
49.         {
50.             //Get the name of the reference image
51.             var imageName = trackedimage.referenceImage.name;
52.  
53.  
54.             // Now loop over the array of prefabs
55.             foreach (var curPrefab in ArPreFabs)
56.             {
57.                 Instantiate(curPrefab, trackedimage.transform);
58.  
59.                 // Check whether this prefab matches the tracked image name, and hasnt already been created
60.                 if (string.Compare(curPrefab.name, imageName, System.StringComparison.OrdinalIgnoreCase) == 0
61.                     && !_instantiatedPrefabs.ContainsKey(imageName))
62.                 {
63.  
64.                     // Instantiate the prefab, parenting it to the ARTrackedImage
65.                     var newPrefab = Instantiate(curPrefab, trackedimage.transform);
66.                     // And the created prefab to our array
67.                     _instantiatedPrefabs[imageName] = newPrefab;
68.  
69.  
70.                     Debug.Log("Instantiated prefab name: " + newPrefab.name);
71.  
72.  
73.                 }
74.             }
75.         }
76.  
77.         // For all prefabs that have been created so far, set them to active or not depending
78.         // on whether their corresponding image is currently being tracked
79.         foreach (var trackedImage in eventsArg.removed)
80.         {
81.  
82.             Debug.Log("image Removed: " + trackedImage.referenceImage.name);
83.  
84.             // Destroy Prefab
85.             Destroy(_instantiatedPrefabs[trackedImage.referenceImage.name]);
86.  
87.             // Also remove the instance from our array
88.             _instantiatedPrefabs.Remove(trackedImage.referenceImage.name);
89.  
90.             // Or simply set the prefab instance to inactive
91.             //_instantiatedPrefabs[trackedImage.referenceImage.name].SetActive(false);
92.  
93.         }
94.     }
95. }

 

@andyb-unity
I was using AR Core for an Android build.

I used Debug.Log to see what info I could find but no no detail came through although the image count was correct (4).

 

Hi I'm having a similar issue as the original poster.
I've been following the Create a marker-based AR App tutorial here:
https://learn.unity.com/tutorial/sp...984dedbc2a587fd7020e#6385cd51edbc2a0c6fdee241.

I've successfully completed it using Unity Editor version 2021.3.1f1. I'm trying to apply what I have learned to a new project using Unity Editor 2022.3.7f1 (Build Target IOS), but keep on coming up against the following error:
BuildFailedException: Reference image at Index 0 named 'Bis AR Marker' in library 'Assets/Markers/ReferenceImageLibrary.asset' is missing a texture.

Despite having specified a Texture, removing and updating all the deprecated Components as directed? See attached screenshots.

Is this a bug or am i missing something?