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// Disable instantiated prefabs that are no longer being actively tracked
foreach (var trackedImage in eventArgs.updated) { 
    _instantiatedPrefabs[trackedImage.referenceImage.name] 
        .SetActive(trackedImage.trackingState == TrackingState.Tracking); 
} 

// Remove is called if the subsystem has given up looking for the trackable again.
// (If it's invisible, its tracking state would just go to limited initially).
// Note: ARCore doesn't seem to remove these at all; if it does, it would delete our child GameObject
// as well.

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private void OnTrackedImagesChanged(ARTrackedImagesChangedEventArgs eventArgs) 
{
    // Go through all tracked images that have been added 
    // (-> new markers detected) 
    foreach (var trackedImage in eventArgs.added) 
    { 
        // Get the name of the reference image to search for the corresponding prefab 
        var imageName = trackedImage.referenceImage.name; 
        
        foreach (var curPrefab in ArPrefabs) 

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ARAnchor CreateAnchor(in ARRaycastHit hit)
{
    ARAnchor anchor;

    // ... here, we'll place the plane anchoring code!

    // If we hit a plane, try to "attach" the anchor to the plane
    if (hit.trackable is ARPlane plane)
    {
        var planeManager = GetComponent<ARPlaneManager>();

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ARAnchor CreateAnchor(in ARRaycastHit hit)
{
    ARAnchor anchor;

    // ... here, we'll place the plane anchoring code!
    
    // Otherwise, just create a regular anchor at the hit pose

    // Note: the anchor can be anywhere in the scene hierarchy
    var instantiatedObject = Instantiate(_prefabToPlace, hit.pose.position, hit.pose.rotation);

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void Update()
{
    // Only consider single-finger touches that are beginning
    Touch touch; 
    if (Input.touchCount < 1 || (touch = Input.GetTouch(0)).phase != TouchPhase.Began) { return; }
        
    // Perform AR raycast to any kind of trackable
    if (_raycastManager.Raycast(touch.position, Hits, TrackableType.AllTypes))
    {
        // Raycast hits are sorted by distance, so the first one will be the closest hit.

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public class ARPlaceHologram : MonoBehaviour
{
    // The prefab to instantiate on touch.
    [SerializeField]
    private GameObject _prefabToPlace;

    // Cache ARRaycastManager GameObject from ARCoreSession
    private ARRaycastManager _raycastManager;

    // List for raycast hits is re-used by raycast manager

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using UnityEngine;
using UnityEngine.XR.ARFoundation;

public class PointCloudInfo : MonoBehaviour
{
    // The AR Foundation PointCloud script
    private ARPointCloud _pointCloud;

    // Reference to logging UI element in the canvas
    public UnityEngine.UI.Text Log;

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// Define number of choices available.
// Generated options: 0.. < num_max
const num_max = 5;

// Randomize array in-place using Durstenfeld shuffle algorithm
// Based on: https://stackoverflow.com/questions/2450954/how-to-randomize-shuffle-a-javascript-array
function shuffleArray(array) {
    for (var i = array.length - 1; i > 0; i--) {
        var j = Math.floor(Math.random() * (i + 1));
        var temp = array[i];

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        // Get the aspect ratio for the current texture.
        var textureAspectRatio = (float)texture.width / texture.height;

        // Determine the raw image rectSize preserving the texture aspect ratio, matching the screen orientation,
        // and keeping a minimum dimension size.
        const float minDimension = 480.0f;
        var maxDimension = Mathf.Round(minDimension * textureAspectRatio);
        var rectSize = new Vector2(maxDimension, minDimension);
        //var rectSize = new Vector2(minDimension, maxDimension);   //Portrait
        rawImage.rectTransform.sizeDelta = rectSize;

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    // Source: https://github.com/Unity-Technologies/arfoundation-samples/blob/6296272a416925b56ce85470e0c7bef5c913ec0c/Assets/Scripts/CpuImageSample.cs
    private static void UpdateRawImage(RawImage rawImage, XRCpuImage cpuImage)
    {
        // Get the texture associated with the UI.RawImage that we wish to display on screen.
        var texture = rawImage.texture as Texture2D;

        // If the texture hasn't yet been created, or if its dimensions have changed, (re)create the texture.
        // Note: Although texture dimensions do not normally change frame-to-frame, they can change in response to
        //    a change in the camera resolution (for camera images) or changes to the quality of the human depth
        //    and human stencil buffers.