unity贴花系统 unity使用射线实现贴花系统

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
/// <summary>
/// 贴花系统
/// </summary>
public class Applique_ZH: MonoBehaviour
{
 [Header("贴花粒子")]
 public Transform _AppliqueParticle;
 void Start()
 {
   //实例化
  _AppliqueParticle = Instantiate(_AppliqueParticle);
 }
 void LateUpdate()
 {
 Applique();
 }
 //贴花实现
 public void Applique()
 {
  //屏幕坐标转射线
  object _Ray = Camera.main.ScreenPointToRay(Input.mousePosition);
  //射线对象是：结构体类型（存储了相关信息）
  RaycastHit _Hit;
  //发出射线检测到了碰撞 isHit返回的是 一个bool值
  bool _IsHit = Physics.Raycast((Ray)_Ray, out _Hit, 1000, ~(LayerMask.GetMask("AppliqueParticle")| LayerMask.GetMask("Click")));
  //EventSystem.current.IsPointerOverGameObject() 鼠标在UI上面
  if (_IsHit && !EventSystem.current.IsPointerOverGameObject())
  {
   _AppliqueParticle.localPosition = _Hit.point;
   _AppliqueParticle.localRotation = Quaternion.LookRotation(_Hit.normal);
  }
 }
}