using System.Collections;
using System.Collections.Generic;
using UnityEngine;
 
public class RayTest : MonoBehaviour {
  //設(shè)置射線在Plane上的目標(biāo)點(diǎn)target
  private Vector3 target;
 // Use this for initialization
 void Start () {
    //初始化目標(biāo)點(diǎn)與自身的點(diǎn)重合
    target = transform.position;
 }
 
 // Update is called once per frame
 void Update () {
    //當(dāng)點(diǎn)擊鼠標(biāo)左鍵的時(shí)候創(chuàng)建一條射線
    if(Input.GetMouseButton(0))
    {
      //定義射線
      Ray m_ray;
      //保存碰撞信息
      RaycastHit m_hit;
      //創(chuàng)建一條從攝像機(jī)發(fā)出經(jīng)過(guò)屏幕上的鼠標(biāo)點(diǎn)的一條射線
      m_ray = Camera.main.ScreenPointToRay(Input.mousePosition);
      //判斷射線是否碰撞到物體
      if(Physics.Raycast(m_ray,out m_hit))
      {
        //判斷碰撞到的是不是Plane
        if(m_hit.transform.name=="Plane")
        {
          //把目標(biāo)點(diǎn)target設(shè)置為m_hit.point，//并使物體要處于Plane上所以Y軸為0.5f
          target = new Vector3(m_hit.point.x, 0.5f, m_hit.point.z);
 
        }
      }
    }
    Move(target);
 }
  //移動(dòng)方法
  void Move(Vector3 target)
  {
    if (Vector3.Distance(transform.position, target) > 0.1f)
    {
      transform.position = Vector3.Lerp(transform.position, target,Time.deltaTime);
    }
    //如果物體的位置和目標(biāo)點(diǎn)的位置距離小于 0.1時(shí)直接等于目標(biāo)點(diǎn)
    else
      transform.position = target;
  }
}