Class that takes the content from a Vuforia Image target and puts it inside of a ground plane stage

AnchorTargetListener.cs

using UnityEngine;
using Vuforia;

public class AnchorTargetListener : MonoBehaviour, ITrackableEventHandler 
{

    //The Goal of this class is to automatically Initiate a Ground Plane when the Image Target is detected
    // Use this classs in combination with the PlaceContentFromImageTarget if you want to move the content
    // of an image target onto the Ground Plane Stage

    //This class should replace the default AnchorInputListenerBehaviour in the PlaneFinder GameObject
    //Don't forget to set the OnInputReceivedEvent of this component to call the PlaneFinderBehaviour

    public ImageTargetBehaviour ImageTarget;
    private bool _planeFound = false;

    
    public AnchorInputListenerBehaviour.InputReceivedEvent OnInputReceivedEvent;

	void Start () 
	{
	    if (this.ImageTarget != null)
	    {
            this.ImageTarget.RegisterTrackableEventHandler(this);
	    }
	}
	
    public void OnTrackableStateChanged(TrackableBehaviour.Status previousStatus, TrackableBehaviour.Status newStatus)
    {
        if (_planeFound)
        {
            return;
        }

        if (newStatus == TrackableBehaviour.Status.DETECTED ||
            newStatus == TrackableBehaviour.Status.TRACKED )
        {
            Debug.Log("Target Found!");

            if (OnInputReceivedEvent != null)
            {
                //TODO: is Camera.main still slow?
                var hitTestLocation = Camera.main.WorldToScreenPoint(this.ImageTarget.transform.position);

                Debug.Log("hit test location: " + hitTestLocation);

                this.OnInputReceivedEvent.Invoke(hitTestLocation);

                _planeFound = true;
            }
            
        }
    }
}

PlaceContentFromImageTarget.cs

using System;
using UnityEngine;
using Vuforia;

public class PlaceContentFromImageTarget : MonoBehaviour 
{
    //This class should replace the default ContentPositioningBehaviour in the PlaneFinder GameObject
    //Don't forget to set the OnInteractiveHitTest of the PlaneFinderBehaviour to call this class

    //IMPORTANT:
    // Be sure to enable Device Tracker and set mode to POSITIONAL in the Vuforia Configuration

    public AnchorStageBehaviour AnchorStage;
    public ImageTargetBehaviour ImageTarget;
    private PositionalDeviceTracker _deviceTracker;

    private bool _anchorSet;

    public void Start ()
    {

        var x = new ContentPositioningBehaviour();
        var y = x.AnchorStage;


        if (AnchorStage == null)
        {
            Debug.LogWarning("AnchorStage must be specified");
            return;
        }

        if (ImageTarget == null)
        {
            Debug.LogWarning("Image Target must be specified");
            return;
        }

        AnchorStage.gameObject.SetActive(false);
    }
 
    public void Awake()
    {
        VuforiaARController.Instance.RegisterVuforiaStartedCallback(OnVuforiaStarted);
    }
 
    public void OnDestroy()
    {
        VuforiaARController.Instance.UnregisterVuforiaStartedCallback(OnVuforiaStarted);
    }
 
    private void OnVuforiaStarted()
    {
        _deviceTracker = TrackerManager.Instance.GetTracker<PositionalDeviceTracker>();
    }
 
    public void OnInteractiveHitTest(HitTestResult result)
    {
        if (_anchorSet)
        {
            //Leave if the anchor has already been set
            return;
        }

        if (result == null || AnchorStage == null)
        {
            Debug.LogWarning("Hit test is invalid or AnchorStage not set");
            return;
        }
        
        //Let's go ahead and create the anchor at the position of the hit test
        var anchor = _deviceTracker.CreatePlaneAnchor(Guid.NewGuid().ToString(), result);
        
        if (anchor != null)
        {
            AnchorStage.transform.SetParent(anchor.transform); 
            AnchorStage.transform.localPosition = Vector3.zero;
            AnchorStage.transform.localRotation = Quaternion.identity;
            AnchorStage.gameObject.SetActive(true);

            //Make sure that the Image Target is currently tracking
            if (ImageTarget.CurrentStatus == TrackableBehaviour.Status.DETECTED ||
                ImageTarget.CurrentStatus == TrackableBehaviour.Status.TRACKED ||
                ImageTarget.CurrentStatus == TrackableBehaviour.Status.EXTENDED_TRACKED)
            {

                //Note: If you are handling objects differently, there is an opportunity to optimize this section
                var defaultEventHandler = this.ImageTarget.GetComponent<DefaultTrackableEventHandler>();
                if (defaultEventHandler != null)
                {
                    defaultEventHandler.OnTrackableStateChanged(TrackableBehaviour.Status.UNKNOWN,
                        TrackableBehaviour.Status.TRACKED);
                }
                
                //Let's move the contents of the image target onto the ground plane
                for (var i = 0; i < ImageTarget.transform.childCount; i++)
                {
                    var content = ImageTarget.transform.GetChild(i);
                    content.SetParent(AnchorStage.transform);
                }
            }

            _anchorSet = true;

        }
    }
}

I have a question, why in this part of code:

var anchor = _deviceTracker.CreatePlaneAnchor(Guid.NewGuid().ToString(), result);

    if (anchor != null)
    {
        AnchorStage.transform.SetParent(anchor.transform); 
        AnchorStage.transform.localPosition = Vector3.zero;
        AnchorStage.transform.localRotation = Quaternion.identity;
        AnchorStage.gameObject.SetActive(true);

where say AnchorStage.transform.SetParent(anchor.transform); in anchor.transform have an error

The class Anchor has changed and doesn't have a 'transform' property.
The solution is to attach a component AnchorBehaviour on the gameObject you want anchored. Then, you do something like: anchoredObject.GetComponent().ConfigureAnchor(anchor);

hey which version of Vuforia/Unity did you have this working with?

This was probably using Vuforia 7 and Unity 2018.1 or 2018.2

Okay so pre ARFoundation

@yosun - yes, does Vuforia Engine now support ARFoundation?

is this still functioning in vuforia 8.1.10 than?

From where did you learn vuforia codes

It's seem Little complicated for to study vuforia documentation

@vad710 I got this ported to Vuforia 10. Is that something you want to share by any chance? I don't use github much but maybe I can upload it and you could link it?

Sure - I'd be happy to update it!