Extended Tracking exception

Questions & Answers
1

Hi,

I have enabled extended tracking and almost always it works just fine, but sometimes happens that my object disapears. I want to prevent it, at least with some kind of notification (“You lost target, you need to find it again.”). The question is, how to check if object actually disappears.

2

Answer for myself :smiley:

protected TrackableBehaviour mTrackableBehaviour;
    
    void Awake ()
    {
        mTrackableBehaviour = GetComponent<TrackableBehaviour>();
    }

Remember that this class has to be in the same object as DefaultTrackableEventHandler.cs is, inherit from ITrackableEventHandler, and about

using Vuforia;

After that you can check STATES of your tracking. All states you find here:
https://library.vuforia.com/content/vuforia-library/en/reference/unity/classVuforia_1_1TrackableBehaviour.html#a67a0db04d321a74b7e7fcfd3f1a3f70baf8c96098a30de26eecad683692f70169

For example:

if (mTrackableBehaviour.CurrentStatus ==TrackableBehaviour.Status.NO_POSE )
{
      ShowAlert();
}