Unity3d click events added to 3D objects in the scene

 

Unity3D - Scene 3D Add mouse click event to the object

Mouse click 3D Object trigger ,Unity In essence, there are two ： One is through events （event） Trigger , One is through rays （ray) Judge whether the passing object triggers . The principles of these two triggers are different , No matter what kind of trigger, it must meet the trigger requirements , Since the principle is different , The requirements for triggering are also different , Let's elaborate on 3 Different ways .

 

Unity edition 5.6.2f  Unity API edition 2019.1 

 

Reference resources Unity API： https://docs.unity3d.com/ScriptReference/EventSystems.EventSystem.html

 

One 、 Through the event , Implementation interface IPointerClickHandler 

First understand the interface IPointerClickHandler, This connection is   UnityEngine.EventSystems.Interfaces.IPointerClickHandler, Now let's see what other interfaces it can implement

Here we use IPointerClickHandler give an example （api It's like this ）：

That is, after implementing the interface in our clicked class , In the implementation method OnPointerClick, Operate the post click processing in this method .

 

Since it's an event , First, meet the requirements of event triggering ：

 

1. To the in the scene Camera add to PhysicsRaycaster Script .

 

 

2. Add an event system to the scene EventSystem, Operate as shown in the figure ：

 

Click on Add Default... Then it appears as shown in the picture ：

 

3. The key is coming. , Set the clicked object （3D） object , Be sure to bring a trigger （Collider）, Then hang the post-processing script on the clicked object .

Come here , There is only one script we need to develop ,Demo Inside EventClick.cs 

 

 

using UnityEngine;
using UnityEngine.EventSystems;

public class EventClick : MonoBehaviour,IPointerClickHandler
{
    public void OnPointerClick(PointerEventData eventData)
    {
        print(" Click. ：："+this.name);
    }
}

 

 

Run Click cube：

 

 

Two 、 Through the event , Attach script EventTrigger

 

This is also achieved through the same event , Also follow the One Meet the requirements of event triggering ( Don't understand, ！ Look up ）：

1. To the in the scene Camera add to PhysicsRaycaster Script .

2. Add an event system to the scene EventSystem;

After completing the above two steps ,3 It's different from Yili's .

3. There are two ways , Namely 3.1 and 3.2 , It's just different in usage , The principle is the same .

First, add EventTrigger Script .

 

3.1, It is triggered by statically added events

to EventTrigger Add event type , Select as needed ,

 

Demo Select click event PointerClick

 

to PointerClick Add post trigger execution function

 

The execution function here , It is the class we developed below ClickEventTrigger.cs, Add this script to the clicked object .

 

 

using UnityEngine;
using UnityEngine.Events;
using UnityEngine.EventSystems;

public class ClickEventTrigger : MonoBehaviour 
{
public void OnClick()
    {
        print("MyOnClick  Click. ：："+this.name);
    }
}

 

 

Come here , Adding events statically is complete , Running effect ：

 

3.2, It is triggered by dynamically adding events

Dynamic trigger , stay Unity It is much more convenient to operate in the editor , Just add EventTrigger That's all right. , Then put our script ClickEventTrigger.cs Add to the clicked object , The rest is done in code .

 

 

using UnityEngine;
using UnityEngine.Events;
using UnityEngine.EventSystems;

public class ClickEventTrigger : MonoBehaviour {

// Use this for initialization
void Start () {

        // Get or add EventTrigger Components 
        EventTrigger trigger = transform.GetComponent();
        if (trigger == null)
        {
            trigger = transform.gameObject.AddComponent();
        }
        // initialization EventTrigger.Entry Array of   If the event trigger array is initialized here , So in ide Statically added events will be lost 
        //trigger.triggers = new List();
        // Create a variety of  EventTrigger.Entry The type of 
        EventTrigger.Entry entry = new EventTrigger.Entry();
        entry.eventID = EventTriggerType.PointerEnter;// Set up Entry Of eventID type   namely EventTriggerType Various enumerations of （ For example, mouse click , slide , Drag, etc ）
        UnityAction callback = new UnityAction(OnPointerEnter);  // Registration agent 
        entry.callback.AddListener(callback);// Add proxy events to EventTrigger.Entry

        EventTrigger.Entry entry2 = new EventTrigger.Entry();
        entry2.eventID = EventTriggerType.PointerDown;
        UnityAction callback1 = new UnityAction(OnPointerDown);
        entry2.callback.AddListener(callback1);

        // stay EventTrigger.Entry Add to the array of EventTrigger.Entry
        trigger.triggers.Add(entry);
        trigger.triggers.Add(entry2);
    }

    private void OnPointerDown(BaseEventData arg0)
    {
        Debug.Log("OnPointerDown");
    }

    private void OnPointerEnter(BaseEventData arg0)
    {
        Debug.Log("OnPointerEnter");
    }
}

 

 

Running results ：

 

3、 ... and 、 By ray ,RayCastHitControl

This method is mainly through , Ray emission , Judge the object through which the ray passes , Judge whether the object is clicked according to the specific sign （ such as ： The label of the object Tag, And the name of the object ）

All we need here is 3d object , And there is a clear and unique identification , Plus what we developed ClickRayCastHitControl.cs Can .

 

1. Create an object in the scene （Cube）, And then click Inspector Under the panel Tag - AddTag...- stay Tags In the list , Click on +, Enter the you want to add Tag Name is OK . establish Tag After completion , Go back to the scene and give this Cube Choose the Tag.

 

2. Creating a Cube,demo Medium name （BeiJiChaun), This name is the symbol of ray passing judgment , This object is created .

 

3. Create a separate layer , Just mount the script we developed .

 

Running results ：

 

Complete code ：

 

 

using UnityEngine;

public class ClickRayCastHitControl : MonoBehaviour {

    Ray ray;
    RaycastHit hit;
    GameObject obj;
    // Use this for initialization
    void Start () {

}

    // Update is called once per frame
    
    void Update()
    {
        if (Input.GetMouseButtonDown(0))
        {
            Debug.Log(" Left click ");
            ray = Camera.main.ScreenPointToRay(Input.mousePosition);
            if (Physics.Raycast(ray, out hit))
            {
                Debug.Log(hit.collider.gameObject.name);
                obj = hit.collider.gameObject;
                // By name 
                if (obj.name.Equals("BeiJiChuan"))
                {
                    Debug.Log(" Point in " + obj.name);
                }
                // Through the label 
                if (obj.tag == "ClicObj")
                {
                    Debug.Log(" Point in " + obj.name);
                }
            }
        }
    }
}