MonoBehaviour.OnBecameVisible()

Description

Called when the renderer becomes visible to any camera.

This message is sent to all scripts attached to the renderer. OnBecameVisible and MonoBehaviour.OnBecameInvisible are useful to avoid computations that are only necessary when the object is visible.

The Scene view camera in the Unity Editor is treated like a regular camera for visibility checks, so OnBecameVisible can be called when objects are visible in the Scene view, even if the application isn't running. Scripts that execute in Edit mode can check Application.isPlaying before running important logic in OnBecameVisible to avoid unintended behavior in the Editor.

OnBecameVisible can be a coroutine.

// Enables the behaviour when it is visible

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour
{
    void OnBecameVisible()
    {
        enabled = true;
    }
}