Image Tracking "extended"

Hi everybody,
I'm doing an AR app using Unity 2018.3 and ARKit 2.0 plugin from BitBucket.

I would like to know if with the Image Tracking It's possible to have something like "extended tracking" (like in Vuforia). I mean the 3d model should be in the scene also when the image target is out of camera.

In XCode I'm able to do that using the configuration "ARWorldTrackingConfiguration()" and set "configuration.detectionImages = trackedImages" and "configuration.maximumNumberOfTrackedImages = 1", as explained here: https://developer.apple.com/documentation/arkit/arimagetrackingconfiguration

Particular attention to: Image-only tracking lets you anchor virtual content to known images only when those images are in view of the camera. World tracking with image detection lets you use known images to add virtual content to the 3D world, and continues to track the position of that content in world space even after the image is no longer in view.

Thanks in advance,
Simon

 

Did you ever figure this out?

 

I figured it out. Take a look at the

GenerateImageAnchor

script and look at how

UpdateImageAnchor

sets the

imageAnchorGO.SetActive(false)

if the

imageAnchorGO.activeSelf 

. Just comment out the check for isTracked, and simply always update the position.

Code (CSharp):

1.  
2.     void UpdateImageAnchor(ARImageAnchor arImageAnchor)
3.     {
4.         Debug.LogFormat("image anchor updated[{0}] : tracked => {1}", arImageAnchor.identifier, arImageAnchor.isTracked);
5.         if (arImageAnchor.referenceImageName == referenceImage.imageName) {
6.                 if (!imageAnchorGO.activeSelf)
7.                 {
8.                     imageAnchorGO.SetActive(true);
9.                 }
10.                 imageAnchorGO.transform.position = UnityARMatrixOps.GetPosition(arImageAnchor.transform);
11.                 imageAnchorGO.transform.rotation = UnityARMatrixOps.GetRotation(arImageAnchor.transform);
12.         }
13.  
14.     }

 

Hey any luck on how to do this for current ARKit?