unity怎么实现人脸追踪_unity_小功能实现（敌人追踪主角）
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;
}
}