Use GraphicRaycaster in Editor Mode

I would like to do a right click and be able to log every UI hit.

I have this class but seems not to be raycasting, or the pointer event data is wrong.

In the scene view i have a canvas with and Image and inside of it a Button.

Code (CSharp):

1. using System.Collections.Generic;
2. using UnityEditor;
3. using UnityEngine;
4. using UnityEngine.EventSystems;
5. using UnityEngine.UI;
6.  
7. [InitializeOnLoad]
8. public class RightClick : Editor{
9.     static GraphicRaycaster raycaster;
10.     static PointerEventData pointerEventData;
11.     static EventSystem eventSystem;
12.  
13.     static RightClick(){
14.         SceneView.onSceneGUIDelegate += OnSceneGUI;
15.     }
16.  
17.     static void OnSceneGUI(SceneView sceneview){
18.         if (Event.current.button == 1) {
19.             if (Event.current.type == EventType.MouseDown) {
20.                 raycaster = FindObjectOfType<GraphicRaycaster>();
21.                 eventSystem = FindObjectOfType<EventSystem>();
22.                 pointerEventData = new PointerEventData(eventSystem) { position = Event.current.mousePosition};
23.  
24.                 List<RaycastResult> results = new List<RaycastResult>();
25.                 raycaster.Raycast(pointerEventData, results);
26.  
27.                 foreach (RaycastResult result in results) {
28.                     Debug.Log("Hit: " + result.gameObject.name);
29.                 }
30.             }
31.         }
32.     }
33. }

 

It's similar to the script provided in the doc, but I need it working in editor

https://docs.unity3d.com/ScriptReference/UI.GraphicRaycaster.Raycast.html

 

Hi Martin! Did you ever figure this out? Trying to achieve the same thing.

 

Nope

 

Did some more tests, it seems that

1) The Raycast methods only work in play mode
2) The coordinate conversions are tricky to get right

 

There must be a way, I want to throw a raycast and get all UIs I've hit

 

I had a bit of luck in getting it to work, but..
1. It only works in 2D mode & orthographic directly from the front.
2. It requires that the canvas is set to Screen Space - Camera, and that a render camera is set.
3. It requires raycastTarget to be enabled on the UI elements in order to detect them (might be obvious, but if it's a requirement to hit all the UI, this approach won't work)

Code (CSharp):

1. Vector3 screenPosition = Event.current.mousePosition;
2.  
3. // Event.current.mousePosition has (0,0) in top-left corner, but the UI system has (0,0) in bottom-left => convert the point
4. screenPosition.y = sceneview.camera.pixelHeight - screenPosition.y;
5.  
6. // Convert from one camera to the other by using the world point as the intermediate step
7. var sceneWorldPoint = sceneview.camera.ScreenToWorldPoint(screenPosition);
8.  
9. // Find the required UI objects
10. var raycaster   = FindObjectOfType<GraphicRaycaster>();
11. var eventSystem = FindObjectOfType<EventSystem>();
12.  
13. // Convert back to screen point using the UI camera
14. var gameScreenPoint  = raycaster.eventCamera.WorldToScreenPoint(sceneWorldPoint);
15. var pointerEventData = new PointerEventData(eventSystem) {position = gameScreenPoint};
16. var results = new List<RaycastResult>();
17. raycaster.Raycast(pointerEventData, results);