ARKit and Vuforia - marker recognition

Question

I'm working on an iOS app, I need to recognize a marker (most likely it will be QR code) and place some 3D content over it using ARKit.

I was thinking about a combination of Vuforia and ARKit.

Is it possible to use Vuforia only to recognize the marker and get its position, and then "pass" this data to ARKit?

• I need to recognize the marker in order to select corresponding 3D content.
• I need to get the position of the marker only ones, in order to place 3D content there, after that I want to use ARKit for tracking.

Is it possible?
Is there another solution for marker recognition which can be used with ARKit?

Answer 1

Q1: You can handle the recognition of the marker (called Image Target in Vuforia) Create a script:

public class CustomTrackableEventHandler : MonoBehaviour,
                                           ITrackableEventHandler
{
    ...

    public void OnTrackableStateChanged(
                                    TrackableBehaviour.Status previousStatus,
                                    TrackableBehaviour.Status newStatus)
    {
        if (newStatus == TrackableBehaviour.Status.DETECTED ||
            newStatus == TrackableBehaviour.Status.TRACKED ||
            newStatus == TrackableBehaviour.Status.EXTENDED_TRACKED)
        {
            OnTrackingFound(); 
            // **** Your own logic here ****
        }
        else
        {
            OnTrackingLost();
        }
    }
}

Then you can replace the DefaultTrackableEventHandler with this this script.

Q2: I need to get the position of the marker only ones, in order to place 3D content there, after that I want to use ARKit for tracking.

You can add an empty game object to be the child of the marker (ImageTarget), and the hierarchy would be:

YourMarker(ImageTarget)
     |__EmptyPlaceHolder

When the marker is recognised, you can then programatically get its location:

var placeHolder = GameObject.Find("EmptyPlaceHolder");
if(placeHolder != null){
    Debug.Log(placeHolder.transform.position); // all the location, localPosition, quaternion etc will be available to you

}