How to keep tracked Image Target model object after tracking lost?

Question

I am developing AR application with Unity3d and Vuforia. I want to keep ImageTarget object that tracked found when It was lost. How to keep tracked Image Target model object after tracking lost?

Answer 1

The script that handles what happens when tracking is lost is called DefaultTrackableEventHandler.cs and is found in Assets > Vuforia > Scripts. In that file you will find a function OnTrackingLost() This function disables all the renderComponents and colliderComponents for each of the children of the ImageTarget. If you want your object to stay visible comment out the following foreach loops like so:

private void OnTrackingLost()
{
    Renderer[] rendererComponents = GetComponentsInChildren<Renderer>(true);
    Collider[] colliderComponents = GetComponentsInChildren<Collider>(true);

    /*
    // Disable rendering:
    foreach (Renderer component in rendererComponents)
    {
        component.enabled = false;
    }

    // Disable colliders:
    foreach (Collider component in colliderComponents)
    {
        component.enabled = false;
    }
    */

    Debug.Log("Trackable " + mTrackableBehaviour.TrackableName + " lost");
}