Unity3d 检测物体在不在摄像机照射范围内

using System.Collections;  
using System.Collections.Generic;  
using UnityEngine;  
/// 
  
/// 将脚本挂在摄像机观察的物体上  物体必须带有Render  
///方法在Update调用了,实时监测的
/// 
  
public class PlayerView : MonoBehaviour {  
  
    bool isRendering;    
    float curtTime = 0f;  
    float lastTime = 0f;  
  
    void OnWillRenderObject()  
    {  
        curtTime = Time.time;  
    }  
    public bool IsInView(Vector3 worldPos)  
    {  
        Transform camTransform = Camera.main.transform;  
        Vector2 viewPos = Camera.main.WorldToViewportPoint(worldPos);  
        Vector3 dir = (worldPos - camTransform.position).normalized;  
        float dot = Vector3.Dot(camTransform.forward, dir);     //判断物体是否在相机前面  
  
        if (dot > 0 && viewPos.x >= 0 && viewPos.x <= 1 && viewPos.y >= 0 && viewPos.y <= 1)  
            return true;  
        else  
            return false;  
    }  
  
    void Update()  
    {  
        Vector2 vec2 = Camera.main.WorldToScreenPoint(this.gameObject.transform.position);  
          
        if (IsInView(transform.position))     
        {  
            Debug.Log("目前本物体在摄像机范围内");  
        }  
        else  
        {  
            Debug.Log("目前本物体不在摄像机范围内");    
        }  
    }  
}