Disable automatic instantiation of ImageTargets for each Target in Library

Is there a setting that disables this behaviour? I have a library with multiple targets in it, however I don't necessarily want ImageTargets instantiated for each target in every scene.

for example, my current library has 2 targets, and I have an ImageTargetBehaviour associated with one of them, when i run the scene I get an additional "new game object" that's associated with the other one. It serves no purpose other than using resources unnecessarily.

thanks.

 

Those are ImageTargetBehaviours that are instantiated because they are active in the target database - all targets in a DB are activated when the DB is activated.

If you want to really optimize runtime resource management, you can manage your database(s) programmatically.
In your case, you might want to create multiple databases which contain a specific set of targets to be activated simultaneously - or you could even create a unique DB for each target. And then (de)activate as needed.

FWIW the ITB GOs shouldn't be costing you much either computationally or memory-wise. They're pretty efficient.

 

thanks for the response. Rather than have multiple databases to maintain, I just created a script that looks for the unwanted ImageTargetBehaviours at runtime and deletes them. Good to know they are efficient however I see no need to leave unwanted behaviours hanging around.

cheers.

 

That's correct,
one way to do that is to have a script like the below attached to each Image Tracker object

using UnityEngine;
using Vuforia;
//Attach to the image tracker
public class ChildObjectsActivator : MonoBehaviour, ITrackableEventHandler
{
private TrackableBehaviour trackableBehaviour;
void Start()
{
trackableBehaviour = GetComponent<TrackableBehaviour>();
if (trackableBehaviour)
trackableBehaviour.RegisterTrackableEventHandler(this);
}

public void OnTrackableStateChanged(
TrackableBehaviour.Status previousStatus,
TrackableBehaviour.Status newStatus)
{
if (newStatus == TrackableBehaviour.Status.DETECTED ||
newStatus == TrackableBehaviour.Status.TRACKED ||
newStatus == TrackableBehaviour.Status.EXTENDED_TRACKED)
OnTrackingFound();
else
onTrackingLost();
}
private void OnTrackingFound()
{
if (transform.childCount > 0)
SetChildrenActive(true);
}
private void onTrackingLost()
{
if (transform.childCount > 0)
SetChildrenActive(false);
}
private void SetChildrenActive(bool activeState)
{
for (int i = 0; i <= transform.childCount; i++)
transform.GetChild(i++).gameObject.SetActive(activeState);
}