Unity实现怪物巡逻追击玩家

来源于一个因为某些原因做废了的Ｄｅｍｏ，但是里面的东西还是挺多的。

这里实现了一个怪物自动追击玩家,丢失目标后,自动返回其原点的功能:

实现思路:

首先，需要用到Unity自带的NavMeshAgent组件，也就是自动寻路组件

然后思路是分为两个部分，思考和移动，首先怪物会思考与玩家的位置，并在满足与玩家的某些交互条件的时候自动切换到相应的状态，也就是将思考结果付之行动。

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.SceneManagement;
using UnityEngine.AI;

/* 
 *琦玉老师的二弟子
 */

namespace Control{//NameSpace_Start--------------------------------------------------------------------------------------------------------

public class Ctrl_EnemyAi : MonoBehaviour {
        //Class_Start--------------------------------------------------------------------------------------------------------

        //1.思考
        //2.移动
        private NavMeshAgent agent;
        private GameObject Player;
        private Vector3 BoringPosition;
        private Ctrl_Enemy_ShuXing EnemyShuXing;
        public float RotateSpeed;

        private void Awake()
        {
            agent = this.GetComponent();
            EnemyShuXing = this.GetComponent();
            BoringPosition = this.transform.position;
            Player = GameObject.FindGameObjectWithTag("Player");
        }

        private void Start()
        {
            StartCoroutine("FindPlayer");
            StartCoroutine("Moving");
        }

        /// 

        /// 寻找玩家协程
        /// 
        /// 
        IEnumerator FindPlayer()
        {
            while (true)
            {
                yield return new WaitForSeconds(0.45f);

                Vector3 PlayerPosition = Player.transform.position;

                if (EnemyShuXing.CurrentState!=Global.GlobalParameter.EnemyState.Dealth)
                {
                    //得到与主角的距离
                    float Distance = Vector3.Distance(transform.position, PlayerPosition);
                    //距离判断
                    if (Distance <= 2.3f)
                    {
                        //攻击状态
                        EnemyShuXing.CurrentState = Global.GlobalParameter.EnemyState.Attack;
                    }
                    else if (Distance <=8f)
                    {
                        //追击状态
                        EnemyShuXing.CurrentState = Global.GlobalParameter.EnemyState.walking;
                    }
                    else
                    {
                        //返回出生位置，Idle
                        EnemyShuXing.CurrentState = Global.GlobalParameter.EnemyState.LostTarget;
                    }

                }

            }
        }

        IEnumerator Moving()
        {
            while (true)
            {
                yield return null;
                switch (EnemyShuXing.CurrentState)
                {

                    case Global.GlobalParameter.EnemyState.walking:                        
                        agent.SetDestination(Player.transform.position);
                        break;
                    case Global.GlobalParameter.EnemyState.LostTarget:
                        agent.SetDestination(BoringPosition);
                        if (Vector3.Distance(BoringPosition, this.transform.position) <= 2.3f)
                        {
                            EnemyShuXing.CurrentState = Global.GlobalParameter.EnemyState.idle;
                        }                      
                        break;
                    default:
                        break;
                }
            }
        }

        private void Update()
        {
            if (EnemyShuXing.CurrentState == Global.GlobalParameter.EnemyState.Attack)
            {
                transform.rotation = Quaternion.Lerp(transform.rotation,Quaternion.LookRotation(Player.transform.position-this.transform.position),RotateSpeed* Time.deltaTime);
            }
        }

        //Class_End--------------------------------------------------------------------------------------------------------
    }
}//NameSpace_End--------------------------------------------------------------------------------------------------------