ARFoundation-トラッキング用スクリプトの問題

前提・実現したいこと

ARFoundationを利用してARアプリし、ARtrackedImageManagerを利用して画像にプレハブを登録してトラッキングさせようとしています。
プレハブは3DオブジェクトとWorldSpaceのCanvasの二種類です。
下記のソースコードについて前者が3Dオブジェクト用のスクリプト、後者がCanvas用のスクリプトです。
Canvas用のスクリプトについては、前者のスクリプトの後半から、
Quaternion rotation = trackedImage.transform.rotation;
prefab.transform.rotation = rotation;
の二行を削除しているのみです。
上記の二行がある場合、canvasの向きを
上のようにしておいても、マーカー画像上でインスタンス化された際にCanvasが自動的にマーカーに対して垂直になってしまうことが理由です。

使用ソースコード

C#
1using System.Collections;
2using System.Collections.Generic;
3using UnityEngine;
4using UnityEngine.XR;
5using UnityEngine.XR.ARFoundation;
6
7[RequireComponent(typeof(ARTrackedImageManager))]
8public class ImageTracking : MonoBehaviour
9{
10
11    [SerializeField]
12    private GameObject[] placeablePrefabs;
13
14    private Dictionary<string, GameObject> spawnedPrefabs = new Dictionary<string, GameObject>();
15    private ARTrackedImageManager trackedImageManager;
16
17    private void Awake()
18    {
19        trackedImageManager = FindObjectOfType<ARTrackedImageManager>();
20
21        foreach (GameObject prefab in placeablePrefabs)
22        {
23            GameObject newPrefab = Instantiate(prefab, Vector3.zero, Quaternion.identity);
24            newPrefab.name = prefab.name;
25            newPrefab.SetActive(false); // 追加
26            spawnedPrefabs.Add(prefab.name, newPrefab);
27        }
28    }
29
30    private void OnEnable()
31    {
32        trackedImageManager.trackedImagesChanged += ImageChanged;
33    }
34
35    private void OnDisable()
36    {
37        trackedImageManager.trackedImagesChanged -= ImageChanged;
38    }
39
40    private void ImageChanged(ARTrackedImagesChangedEventArgs eventArgs)
41    {
42        foreach (ARTrackedImage trackedImage in eventArgs.added)
43        {
44            UpdateImage(trackedImage);
45        }
46        foreach (ARTrackedImage trackedImage in eventArgs.updated)
47        {
48            UpdateImage(trackedImage);
49        }
50        foreach (ARTrackedImage trackedImage in eventArgs.removed)
51        {
52            spawnedPrefabs[trackedImage.name].SetActive(false);
53        }
54    }
55
56    private void UpdateImage(ARTrackedImage trackedImage)
57    {
58        string name = trackedImage.referenceImage.name;
59        Vector3 position = trackedImage.transform.position;
60        Quaternion rotation = trackedImage.transform.rotation;
61
62        GameObject prefab = spawnedPrefabs[name];
63        prefab.transform.position = position;
64        prefab.transform.rotation = rotation;
65        prefab.SetActive(true);
66
67        foreach (GameObject go in spawnedPrefabs.Values)
68        {
69            if (go.name != name)
70            {
71                go.SetActive(false);
72            }
73        }
74    }
75}
76

C#
1using System.Collections;
2using System.Collections.Generic;
3using UnityEngine;
4using UnityEngine.XR;
5using UnityEngine.XR.ARFoundation;
6
7[RequireComponent(typeof(ARTrackedImageManager))]
8public class CanvasTracking : MonoBehaviour
9{
10
11    [SerializeField]
12    private GameObject[] placeablePrefabs;
13
14    private Dictionary<string, GameObject> spawnedPrefabs = new Dictionary<string, GameObject>();
15    private ARTrackedImageManager trackedImageManager;
16
17    private void Awake()
18    {
19        trackedImageManager = FindObjectOfType<ARTrackedImageManager>();
20
21        foreach (GameObject prefab in placeablePrefabs)
22        {
23            GameObject newPrefab = Instantiate(prefab, Vector3.zero, Quaternion.identity);
24            newPrefab.name = prefab.name;
25            newPrefab.SetActive(false); // 追加
26            spawnedPrefabs.Add(prefab.name, newPrefab);
27        }
28    }
29
30    private void OnEnable()
31    {
32        trackedImageManager.trackedImagesChanged += ImageChanged;
33    }
34
35    private void OnDisable()
36    {
37        trackedImageManager.trackedImagesChanged -= ImageChanged;
38    }
39
40    private void ImageChanged(ARTrackedImagesChangedEventArgs eventArgs)
41    {
42        foreach (ARTrackedImage trackedImage in eventArgs.added)
43        {
44            UpdateImage(trackedImage);
45        }
46        foreach (ARTrackedImage trackedImage in eventArgs.updated)
47        {
48            UpdateImage(trackedImage);
49        }
50        foreach (ARTrackedImage trackedImage in eventArgs.removed)
51        {
52            spawnedPrefabs[trackedImage.name].SetActive(false);
53        }
54    }
55
56    private void UpdateImage(ARTrackedImage trackedImage)
57    {
58        string name = trackedImage.referenceImage.name;
59        Vector3 position = trackedImage.transform.position;
60
61        GameObject prefab = spawnedPrefabs[name];
62        prefab.transform.position = position;
63        prefab.SetActive(true);
64
65        foreach (GameObject go in spawnedPrefabs.Values)
66        {
67            if (go.name != name)
68            {
69                go.SetActive(false);
70            }
71        }
72    }
73}
74