Unity 鼠标进入点击3D物体的3种方法

系统管理员 2022-05-08 03:38 586阅读 0赞

第一种 OnMouse

在需要检测的物体上  首先物体要有Collider  添加脚本 使用OnMouse系列方法（脚本的enable不影响OnMouse的调用）

//当鼠标悬停在网格上时，
        void OnMouseEnter（）
        {
           
        } 
    
        // ...当鼠标悬浮在物体上
        void OnMouseOver（）
        {
        
        } 
    
        // ...当鼠标移开时
        void OnMouseExit（）
        {
           
        }
     // ...当鼠标点击
        void OnMouseDown（）
        {
           
        }
     // ...当鼠标抬起
        void OnMouseUp（）
        {
           
        }

//第二种方法 射线检测（首先物体要有Collider 然后挂载脚本）

/************************************************************
      Copyright (C), 2007-2017,BJ Rainier Tech. Co., Ltd.
      FileName: RayCastHitControl.cs
      Author:   Version :1.0       Date: 2018/8/15
      Description:  射线点击
    ************************************************************/
    
    using UnityEngine;
    using System.Collections;
    
    public class RayCastHitControl : MonoBehaviour {
    
    	// Use this for initialization
    	void Start () {
    	
    	}
        Ray ray;
        RaycastHit hit;
        GameObject obj;
        void Update()
        {
            if (Input.GetMouseButtonDown(0))
            {
                Debug.Log("点击鼠标左键");
                ray = Camera.main.ScreenPointToRay(Input.mousePosition);
                if (Physics.Raycast(ray, out hit))
                {
                    Debug.Log(hit.collider.gameObject.name);
                    obj = hit.collider.gameObject;
                    //通过名字
                    if (obj.name.Equals("BeiJiuChuan"))
                    {
                        Debug.Log("点中"+obj.name);
                    }
                    //通过标签
                    if (obj.tag == "move")
                    {
                        Debug.Log("点中" + obj.name);
                    }
                }
            }
        }
    }

//第三种方法  游戏物体 EventTrigger 物体动态事件监听

先说一下 有哪些封装好的公共方法

<table> 
 <tbody> 
  <tr> 
   <td style="vertical-align:top;width:244px;"><a href="https://docs.unity3d.com/ScriptReference/EventSystems.EventTrigger.OnBeginDrag.html" rel="nofollow">OnBeginDrag</a></td> 
   <td style="vertical-align:top;">在拖动开始之前调用。</td> 
  </tr> 
  <tr> 
   <td style="vertical-align:top;width:244px;"><a href="https://docs.unity3d.com/ScriptReference/EventSystems.EventTrigger.OnCancel.html" rel="nofollow">OnCancel</a></td> 
   <td style="vertical-align:top;">发生Cancel事件时由EventSystem调用。</td> 
  </tr> 
  <tr> 
   <td style="vertical-align:top;width:244px;"><a href="https://docs.unity3d.com/ScriptReference/EventSystems.EventTrigger.OnDeselect.html" rel="nofollow">OnDeselect</a></td> 
   <td style="vertical-align:top;">在选择新对象时由EventSystem调用。</td> 
  </tr> 
  <tr> 
   <td style="vertical-align:top;width:244px;"><a href="https://docs.unity3d.com/ScriptReference/EventSystems.EventTrigger.OnDrag.html" rel="nofollow">ondrag</a>Down</td> 
   <td style="vertical-align:top;">每次在拖动期间移动指针时由EventSystem调用。</td> 
  </tr> 
  <tr> 
   <td style="vertical-align:top;width:244px;"><a href="https://docs.unity3d.com/ScriptReference/EventSystems.EventTrigger.OnDrop.html" rel="nofollow">OnDrop</a></td> 
   <td style="vertical-align:top;">当对象接受丢弃时由EventSystem调用。</td> 
  </tr> 
  <tr> 
   <td style="vertical-align:top;width:244px;"><a href="https://docs.unity3d.com/ScriptReference/EventSystems.EventTrigger.OnEndDrag.html" rel="nofollow">OnEndDrag</a></td> 
   <td style="vertical-align:top;">拖动结束后由EventSystem调用。</td> 
  </tr> 
  <tr> 
   <td style="vertical-align:top;width:244px;"><a href="https://docs.unity3d.com/ScriptReference/EventSystems.EventTrigger.OnInitializePotentialDrag.html" rel="nofollow">OnInitializePotentialDrag</a></td> 
   <td style="vertical-align:top;">在找到拖动时，但在有效开始拖动之前由EventSystem调用。</td> 
  </tr> 
  <tr> 
   <td style="vertical-align:top;width:244px;"><a href="https://docs.unity3d.com/ScriptReference/EventSystems.EventTrigger.OnMove.html" rel="nofollow">OnMove</a></td> 
   <td style="vertical-align:top;">发生Move事件时由EventSystem调用。</td> 
  </tr> 
  <tr> 
   <td style="vertical-align:top;width:244px;"><a href="https://docs.unity3d.com/ScriptReference/EventSystems.EventTrigger.OnPointerClick.html" rel="nofollow">OnPointerClick</a></td> 
   <td style="vertical-align:top;">发生Click事件时由EventSystem调用。</td> 
  </tr> 
  <tr> 
   <td style="vertical-align:top;width:244px;"><a href="https://docs.unity3d.com/ScriptReference/EventSystems.EventTrigger.OnPointerDown.html" rel="nofollow">OnPointerDown</a></td> 
   <td style="vertical-align:top;">发生PointerDown事件时由EventSystem调用。</td> 
  </tr> 
  <tr> 
   <td style="vertical-align:top;width:244px;"><a href="https://docs.unity3d.com/ScriptReference/EventSystems.EventTrigger.OnPointerEnter.html" rel="nofollow">OnPointerEnter</a></td> 
   <td style="vertical-align:top;">当指针进入与此EventTrigger关联的对象时由EventSystem调用。</td> 
  </tr> 
  <tr> 
   <td style="vertical-align:top;width:244px;"><a href="https://docs.unity3d.com/ScriptReference/EventSystems.EventTrigger.OnPointerExit.html" rel="nofollow">OnPointerExit</a></td> 
   <td style="vertical-align:top;">当指针退出与此EventTrigger关联的对象时，由EventSystem调用。</td> 
  </tr> 
  <tr> 
   <td style="vertical-align:top;width:244px;"><a href="https://docs.unity3d.com/ScriptReference/EventSystems.EventTrigger.OnPointerUp.html" rel="nofollow">OnPointerUp</a></td> 
   <td style="vertical-align:top;">发生PointerUp事件时由EventSystem调用。</td> 
  </tr> 
  <tr> 
   <td style="vertical-align:top;width:244px;"><a href="https://docs.unity3d.com/ScriptReference/EventSystems.EventTrigger.OnScroll.html" rel="nofollow">OnScroll</a></td> 
   <td style="vertical-align:top;">当Scroll事件发生时由EventSystem调用。</td> 
  </tr> 
  <tr> 
   <td style="vertical-align:top;width:244px;"><a href="https://docs.unity3d.com/ScriptReference/EventSystems.EventTrigger.OnSelect.html" rel="nofollow">ONSELECT</a></td> 
   <td style="vertical-align:top;">当Select事件发生时由EventSystem调用。</td> 
  </tr> 
  <tr> 
   <td style="vertical-align:top;width:244px;"><a href="https://docs.unity3d.com/ScriptReference/EventSystems.EventTrigger.OnUpdateSelected.html" rel="nofollow">OnUpdateSelected</a></td> 
   <td style="vertical-align:top;">更新与此EventTrigger关联的对象时由EventSystem调用。</td> 
  </tr> 
 </tbody> 
</table>

然后说一下使用方法

1.通过编辑器中添加

在Inspector中添加EventTrigger的componnent组件，然后点击Add New Event Type按钮添加一个基本的事件

![70][]

当我们选择一个事件的时候，就相当于将要于此事件绑定了，例如当我们选择Pointer Click的时候，绑定了这个组件的物体将接受Pointer Click 事件的消息，当我们在物体上按下鼠标的时候，（当然空间中的物体我们是无法通过鼠标点击的，但是当我们可以通过射线碰撞的方法，来实现Pointer Enter，Pointer Exit等事件的触发）这里我们用来绑定这个EventTrigger 的是一个UI Panel 这样便可以让它接受我们自定义的单击事件了

![70 1][]

然后脚本方法

/************************************************************
      Copyright (C), 2007-2017,BJ Rainier Tech. Co., Ltd.
      FileName: OnClickMouseDown.cs
      Author:     Version :1.0       Date: 2018/8/15
    ************************************************************/
    
    using UnityEngine;
    using System.Collections;
    using UnityEngine.EventSystems;
    using System.Collections.Generic;
    using UnityEngine.Events;
    
    public class OnClickMouseDown : MonoBehaviour
    {
      
        void Start()
        {
            //获取或添加EventTrigger组件
            EventTrigger trigger = transform.GetComponent<EventTrigger>();
            if (trigger == null)
            {
                trigger = transform.gameObject.AddComponent<EventTrigger>();
            }
            //初始化EventTrigger.Entry的数组
            trigger.triggers = new List<EventTrigger.Entry>();
            //创建各种 EventTrigger.Entry的类型
            EventTrigger.Entry entry = new EventTrigger.Entry();
            entry.eventID = EventTriggerType.PointerEnter;//设置Entry的eventID类型 即EventTriggerType的各种枚举（比如鼠标点击，滑动，拖动等）
            UnityAction<BaseEventData> callback =new UnityAction<BaseEventData>(OnEventTrigger);  //注册代理
            entry.callback.AddListener(callback);//添加代理事件到EventTrigger.Entry
            EventTrigger.Entry entry2 = new EventTrigger.Entry();
            entry2.eventID = EventTriggerType.PointerDown;
            UnityAction<BaseEventData> callback1 =new UnityAction<BaseEventData>(OnMouseDown);
            entry2.callback.AddListener(callback1);
    
            //在EventTrigger.Entry的数组添加EventTrigger.Entry
            trigger.triggers.Add(entry);
            trigger.triggers.Add(entry2);
        }
    
        private void OnMouseDown(BaseEventData arg0)
        {
            Debug.Log("OnMouseDown");
        }
    
        private void OnEventTrigger(BaseEventData arg0)
        {
            Debug.Log("OnEventTrigger");
        }
    }

最后 别忘了 在摄像机下添加一个Physics Raycaster的组件，用来检测鼠标射线

![70 2][]

[70]: /images/20220508/f3932249966e48d390df5d7d5bd7a185.png
[70 1]: /images/20220508/75e3cc73d1d544e3b4e59943f552487c.png
[70 2]: /images/20220508/dfebb825d722425f98c2cd6c30ceaf30.png