在场景中创建一个Plane和一个Sphere以及3个Cube。Plane做为地面，Sphere作为人物，Cube作为敌人。用户通过点击地面，使Sphere移动到点击的位置(不能使用导航网格寻路)。Sphere如果接近敌人一定距离后，敌人会跟随Sphere行动。如果敌人在主角旁边静止2s则主角消失。
public class cube : MonoBehaviour {public Sphere sphere;float des; //与主角之间的距离// Use this for initializationvoid Start () {}// Update is called once per framevoid Update () {des = Vector3.Distance(sphere.transform.position, this.gameObject.transform.position);if(des < 3 && des > 2){ //看向主角并跟随；this.gameObject.transform.LookAt(sphere.transform.position);this.gameObject.transform.Translate(Vector3.forward * Time.deltaTime);}}
public class Sphere : MonoBehaviour {Ray ray;RaycastHit rh;float dis;//鼠标与球的距离Vector3 tar; //目标点private Vector3 lastPos; //上一次运动停止的位置private float lastTime;//上一次运动停止的时间// Use this for initializationvoid Start () {lastPos = transform.position;lastTime = 0;}// Update is called once per framevoid Update () {if (Input.GetMouseButtonDown(0)) {//左键，获得鼠标射线ray = Camera.main.ScreenPointToRay(Input.mousePosition);if (Physics.Raycast(ray, out rh)){if (rh.collider.name == "Plane") //判碰撞物体是否是地面{tar = rh.point;//Debug.Log(rh.point+"2");}}}dis = Vector3.Distance(this.gameObject.transform.position, tar);if (dis > 0.5f) //鼠标点击与球的距离{this.gameObject.transform.LookAt(tar);this.gameObject.transform.Translate(Vector3.forward * Time.deltaTime);}if (dis < 3){if (lastPos != transform.position) //如果上次静止的位置和当前位置不相同,就更新上次静止的位置和时间{lastTime = Time.time;lastPos = transform.position;}if (Time.time - lastTime > 2) //如果静止时间>2s {lastTime = Time.time;Destroy(this.gameObject);}}}}
