1、敌人发现主角有两种形式：

a、看见主角(主角出现在敌人的视野之内)

b、听见主角(听见主角走路声或者是跑步声)

a：看(see)

首先判断主角是否在敌人视野角度内，那么我们只需要判断B<0.5*A能不能成立

b：听(listen)

代码如下：

using UnityEngine;

using System.Collections;

using UnityEngine.AI;

public class EnemySight : MonoBehaviour {

private float seeAngle=120;//敌人视野角度

private bool isSeePlay = false;

private Vector3 lastPos;// 玩家的最后位置

private Vector3 alermPos=Vector3.zero; //警报位置

private Animator anim;  //主角动画，作用是判断主角是否在运动

private SphereCollidersphereCollider;//敌人身上的碰撞器，该碰撞器是用来触发检测主角是否在敌人可见，可听范围内

private NavMeshAgentnavMeshAgent; //AI组件

void Awake()

{

anim = GameObject.FindGameObjectWithTag(Tags.player).GetComponent();

lastPos = GameController._instance.lastPlayerPostion;

navMeshAgent = GetComponent();

}

void Update()

{

//同步主角位置

if (lastPos != GameController._instance.lastPlayerPostion)//触发警报后玩家位置改变

{

alermPos = GameController._instance.lastPlayerPostion; //更新警报位置

lastPos = GameController._instance.lastPlayerPostion;

}

}

void OnTriggleStay(Collider other)

{

if (other.tag==Tags.player)

{

//看玩家

Vector3 startDir = transform.forward;//敌人开始朝向

Vector3 currDir = other.transform.position - transform.position; //敌人看向玩家的向量

float angle = Vector3.Angle(startDir, currDir);//敌人开始朝向与看见玩家朝向的夹角

if (angle

{

//主角在敌人的视野之内

isSeePlay = true;

alermPos = other.transform.position;//把玩家的位置设置为警报位置

GameController._instance.SeePlayer(other.transform);

}

else

{

isSeePlay = false;

}

//听脚步声音

if (anim.GetCurrentAnimatorStateInfo(0).IsName("Locomotion"))//如果玩家在运动

{

NavMeshPath path = new NavMeshPath();

if (navMeshAgent.CalculatePath(other.transform.position, path))

{

Vector3[] wayPoints = new Vector3[path.corners.Length+2];

wayPoints[0] = transform.position;

wayPoints[wayPoints.Length - 1] = other.transform.position;

for (inti = 0; i

{

wayPoints[i + 1] = path.corners[i];

}

float length = 0;

for (inti = 1; i

{

length += (wayPoints[i] - wayPoints[i - 1]).magnitude; //所有节点连接的折线的总长度

}

if (length <= sphereCollider.radius) //在听力范围内

{

alermPos = other.transform.position;

}

}

}

}

}

void OnTriggleExit(Collider other)

{

if (other.tag == Tags.player)

{

isSeePlay = false;

}

}