Hi,

I'ved used as starting point the core sample apps, scene: 3 - ImageTargets.

Moving forward I created script DelayedAugmentation.cs as below:

public class DelayedAugmentation : DefaultTrackableEventHandler

{

protected override void OnTrackingFound()

    {

        if(!coRoutineIsOn){

        StartCoroutine(makeItVisible());

            Debug.Log("Coroutine starting!!!");

      }

    }

private bool coRoutineIsOn = false;

    public float waitingTime = 15f;

    IEnumerator makeItVisible()

    {

        coRoutineIsOn = true;

        yield return new WaitForSeconds(waitingTime);

        if (mTrackableBehaviour)

        {

            var rendererComponents = mTrackableBehaviour.GetComponentsInChildren<Renderer>(true);

            var colliderComponents = mTrackableBehaviour.GetComponentsInChildren<Collider>(true);

            var canvasComponents = mTrackableBehaviour.GetComponentsInChildren<Canvas>(true);

            // Enable rendering:

            foreach (var component in rendererComponents)

                component.enabled = true;

            // Enable colliders:

            foreach (var component in colliderComponents)

                component.enabled = true;

            // Enable canvas':

            foreach (var component in canvasComponents)

                component.enabled = true;

        }

        coRoutineIsOn = false;

    }

protected override void OnTrackingLost()

    {

        if (coRoutineIsOn)

        {

            StopCoroutine(makeItVisible());

            coRoutineIsOn = false;

        }

      

       

        if (mTrackableBehaviour)

        {

            var rendererComponents = mTrackableBehaviour.GetComponentsInChildren<Renderer>(true);

            var colliderComponents = mTrackableBehaviour.GetComponentsInChildren<Collider>(true);

            var canvasComponents = mTrackableBehaviour.GetComponentsInChildren<Canvas>(true);

            // Disable rendering:

            foreach (var component in rendererComponents)

                component.enabled = false;

            // Disable colliders:

            foreach (var component in colliderComponents)

                component.enabled = false;

            // Disable canvas':

            foreach (var component in canvasComponents)

                component.enabled = false;

        }

 

    }

}

The above delays the initialization by 5 seconds. Time can be adjusted in Unity Editor.

I attached the script on the GameObject: ImageTarget_Astronaut and removed also DefaultTrackableEventHandler. ( as our script inherits from DefaultTrackableEventHandler)

Hit Play; In the console you will get the info that the image has been detected and the coroutine has started. After 5 seconds the Astronaut will appear.

Thank you.

Vuforia Engine Support