unityでカメラに写ってる間だけ処理を入れる方法

OnBecameInvisible OnBecameVisibleを使えばいいっぽい

using UnityEngine;
using System.Collections;

public class Script: MonoBehaviour {

 // Use this for initialization
 void Start () {
 
 }
 
 // Update is called once per frame
 void Update () {
 
 }

 void OnBecameInvisible()
 {
  Debug.Log("OnBecameInvisible");
 }

 void OnBecameVisible()
 {
  Debug.Log("OnBecameVisible");
 }
}

これで見えてる間だけ動作するAIとかが作れそう