How replace OnMouseDown in the new Input System?

I want to detect if a player clicked on a specific gameobject. I used to do this with OnMouseDown, but that no longer works in the new input system. In the new system, you can have click actions, but then you detect clicks in the entire screen instead of on one single gameobject.

Code (CSharp):

1. public InputAction clickAction;
2.  
3. void Awake() {
4.       clickAction.performed += ctx => OnClickedTest();
5. }
6.  
7. void OnClickedTest(){
8.       Debug.Log("You clicked anywhere on the screen!");
9. }
10.  
11. // this doesn't work anymore in the new system
12. void OnMouseDown(){
13.       Debug.Log("You clicked on this specific object!");
14. }

How can I detect clicks on a single gameobject with the new input system?

 

You can use ScreenPointToRay off your camera to cast into the scene from the click:

https://docs.unity3d.com/ScriptReference/Camera.ScreenPointToRay.html

From that raycast (or raycastall) you can see what you might have hit.

In fact you could pretty easily reconstruct a generic form of the old click detect by using .SendMessage() to the object that you hit via the above method.

 

I don't think the new Input system changes anything related to OnMouseDown. You may be confusing the Event System with the Input System. What you may be missing though, is that there's a component that ties the Input System together with the Event System, and that is the Input Module. In the new Input System you need an "Input System UI Input Module" instead of the old "Standalone Input Module".

OnMouseDown is also an older less flexible form of https://docs.unity3d.com/2019.1/Doc...ystems.IPointerDownHandler.OnPointerDown.html

 

I ran into a similar problem the other day but I was instantiating objects from the resource folder and OnClick would never save if I assigned it manually in the inspector. etc bottom line I had to use the EventSystems as PraetorBlue describe above.

Here is the snipet I used. (Change USER-Element) to the name of the object you want to click.

Code (CSharp):

1. using UnityEngine.EventSystems;
2. public static GameObject modbtn;
3.  
4. public static GameObject GetEventClickedButton ()
5.     {
6.         EventSystem currentEvent = EventSystem.current;
7.         //Debug.Log (currentEvent.currentSelectedGameObject);
8.         if (currentEvent.currentSelectedGameObject.ToString ().Contains ("USER-Element")) {
9.             modbtn = currentEvent.currentSelectedGameObject.gameObject;
10.         }
11.         return currentEvent.currentSelectedGameObject;
12.     }

 

This. I'm a little surprised that the documentation doesn't make any mention of it because it's clearly confusing a number of people. In fact that basically sums up my entire experience with the new system to date. Many little details that you're never told but have to know to properly use it.

 

Source: https://docs.unity3d.com/2019.1/Documentation/ScriptReference/EventSystems.IPointerClickHandler.html

Interface to implement if you wish to receive OnPointerClick callbacks.

Use the IPointerClickHandler Interface to handle click input using OnPointerClick callbacks. Ensure an Event System exists in the Scene to allow click detection. For click detection on non-UI GameObjects, ensure a PhysicsRaycaster is attached to the Camera.

Code (CSharp):

1. using UnityEngine;
2. using UnityEngine.EventSystems;
3.  
4. public class Example : MonoBehaviour, IPointerClickHandler
5. {
6.    //Detect if a click occurs
7.    public void OnPointerClick(PointerEventData pointerEventData)
8.    {
9.        //Output to console the clicked GameObject's name and the following message. You can replace this with your own actions for when clicking the GameObject.
10.        Debug.Log(name + " Game Object Clicked!");
11.    }
12. }