c# - ARKit tracking for image

Question

I am tracking 2 images and the tracking works fine with ARKit. The problem is, after I track both the images, I cannot go back to track the first one again. That is, first I track Image 1. Then I track Image 2. After this when I go back and track Image 1, I do not get any debug. I feel it ends at foreach (var addedImage in _args.added). How do I make the tracking unlimited?

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.XR.ARSubsystems;
using UnityEngine.XR.ARFoundation;

public class MultipleImageTrack : MonoBehaviour
{
    [Header("The length of this list must match the number of images in Reference Image Library")]
    public List<GameObject> ObjectsToPlace;
    public int checkPoint = 0;
    public GameObject preloadedImage;
    private int refImageCount;
    private Dictionary<string, GameObject> allObjects;
    public ARTrackedImageManager arTrackedImageManager;
    private IReferenceImageLibrary refLibrary;
 
    void Awake()
    {
        
    }
 
    private void OnEnable()
    {
        arTrackedImageManager.trackedImagesChanged += OnImageChanged;
 
    }
 
    private void OnDisable()
    {
        arTrackedImageManager.trackedImagesChanged -= OnImageChanged;
    }
 
    private void Start()
    {
        refLibrary = arTrackedImageManager.referenceLibrary;
        refImageCount = refLibrary.count;
        LoadObjectDictionary();

    }
 
    void LoadObjectDictionary()
    {
        allObjects = new Dictionary<string, GameObject>();
        for (int i = 0; i < refImageCount; i++)
        {
            allObjects.Add(refLibrary[i].name, ObjectsToPlace[i]);
            ObjectsToPlace[i].SetActive(false);

        }
    }
 
    void ActivateTrackedObject(string _imageName)
    {
        debug.text = "scanned: " + _imageName;

        for (int i = 0; i < refImageCount; i++)
        {
            ObjectsToPlace[i].SetActive(false);
        }

        allObjects[_imageName].SetActive(true);
        
    }
 
 
    public void OnImageChanged(ARTrackedImagesChangedEventArgs _args)
    {
        foreach (var addedImage in _args.added)
        {
            checkPoint += 1; //I track here how many times the images get tracked. Maximum it goes is 2

            ActivateTrackedObject(addedImage.referenceImage.name);
           
        }
 
        foreach (var updated in _args.updated)
        {
            allObjects[updated.referenceImage.name].transform.position = updated.transform.position;
            allObjects[updated.referenceImage.name].transform.rotation = updated.transform.rotation;
        }
    }
}

question from:https://stackoverflow.com/questions/65876078/arkit-tracking-for-image

Answer 1

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