判断物体是否在镜头内

using UnityEngine;using System.Collections;public class _IsRendering : MonoBehaviour {public bool isRendering=false;    private float lastTime=0;    private float curtTime=0;    void Update()    {    isRendering=curtTime!=lastTime?true:false;    lastTime=curtTime;    }    void OnWillRenderObject()    {    curtTime=Time.time;    }}