OnBecameVisible does not work

Questions & Answers
1

I am trying to optimize CPU usage for the game so I stop rendering when the object is out and render it again when it come back to screen. But the second part I can’t get it to work. The Cat disappeared but never appeared again even I could see it in the Hierachy in editor.

The code is followed:

using UnityEngine;

public class CatUpdater : MonoBehaviour {
	
	private CatController catController;
	
	void Start () {
		catController = transform.parent.GetComponent<CatController>();  
	}
	
	void UpdateTargetPosition()
	{
		catController.UpdateTargetPosition();
	}

	void GrantCatTheSweetReleaseOfDeath()
	{
		Destroy( transform.parent.gameObject );
	}

	void OnBecameInvisible() 
	{
		renderer.enabled = false;
		catController.OnBecameInvisible();
	}

	void OnBecameVisible()
	{
		if (!renderer.enabled)
		{
			Debug.Log("Cat is visible " +gameObject.name);
			renderer.enabled = true;
		}
	}

}
3

VERY IMPORTANT → If your Scene is visible while you’re running your game, if the object / sprite is visible in your Scene window, the OnBecameVisible() will get called even if it is not visible in Game window.

2

Playing with the function around, I finally understood a bit more. OnBecameVisible only determine if the game object is visible ONCE. Which mean it only run the first time any camera see the object; the next time any camera sees game object, nothing will happen. So I have to repeat the function consistently to make it work in runtime.