using System.Collections;
using System.Collections.Generic;
using UnityEngine;public class Player : MonoBehaviour {public float moveSpeed;    //移动速度public float EyeViewDistance; //视野距离public float viewAngle = 120f; //视野角度private Rigidbody rb;private Collider[] SpottedEnemies; //附近的敌人// Use this for initializationvoid Start () {rb = GetComponent<Rigidbody>();}private void FixedUpdate(){DetectEnemy();}// Update is called once per framevoid Update (){//AutoMove();
        MoveAndTurn();Debug.DrawLine(transform.position, transform.forward * 100, Color.red); //红色射线，面对的方向
    }void AutoMove()  //向面对的方向自动移动
    {transform.position += transform.forward * moveSpeed * Time.deltaTime;}void MoveAndTurn()  //玩家移动
    {Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);RaycastHit hitInfo = new RaycastHit();//shoot a ray from cam to mouse position which is only detected by gameobject with "Plane" layer.Physics.Raycast(ray, out hitInfo, 100, LayerMask.GetMask("Plane"));if (hitInfo.collider != null){transform.LookAt(new Vector3(hitInfo.point.x, transform.position.y, hitInfo.point.z));}rb.velocity = new Vector3(Input.GetAxisRaw("Horizontal"), 0, Input.GetAxisRaw("Vertical")).normalized * moveSpeed;}void DetectEnemy()  //探测敌人
    {//OverlapSphere内的敌人SpottedEnemies = Physics.OverlapSphere(transform.position, EyeViewDistance, LayerMask.GetMask("Enemy"));for(int i = 0;i < SpottedEnemies.Length;i++) //检测每一个敌人是否在视野区中
        {Vector3 EnemyPosition = SpottedEnemies[i].transform.position; //敌人的位置//Debug.Log(transform.forward + " 面对的方向");//Debug.Log("夹角为:" + Vector3.Angle(transform.forward, EnemyPosition - transform.position));
Debug.DrawRay(transform.position, EnemyPosition - transform.position, Color.yellow); //玩家位置到敌人位置的向量if (Vector3.Angle(transform.forward, EnemyPosition - transform.position) <= viewAngle/2)  //这个敌人是否在视野内
            {//如果在视野内RaycastHit info = new RaycastHit();int layermask = LayerMask.GetMask("Enemy", "Obstacles"); //指定射线碰撞的对象Physics.Raycast(transform.position, EnemyPosition - transform.position, out info,EyeViewDistance,layermask); //向敌人位置发射射线
                Debug.Log(info.collider.gameObject.name);if(info.collider == SpottedEnemies[i]) //如果途中无其他障碍物，那么射线就会碰撞到敌人
                {DiscoveredEnemy(SpottedEnemies[i]);}}}}void DiscoveredEnemy(Collider Enemy) //发现敌人
    {//Do somethingDebug.Log("发现敌军:" + Enemy.gameObject.name);Enemy.GetComponent<Enemy>().BeDiscovered();}
}

using System.Collections;
using System.Collections.Generic;
using UnityEngine;public class Enemy : MonoBehaviour {public float HideCoolDown = 0.3f; //隐藏自己的冷却时间public float AppearTime;   //最后一次被发现的时刻private MeshRenderer mr;// Use this for initializationvoid Awake(){mr = GetComponent<MeshRenderer>();}private void Start(){mr.enabled = false;}// Update is called once per framevoid Update (){if (Time.time - AppearTime < HideCoolDown) return;if (mr.enabled)mr.enabled = false;}public void BeDiscovered() //被发现了
    {mr.enabled = true;AppearTime = Time.time;}
}