RaycastAll versus Raycast

Hey all,

Trying to know what UI objects were hit when mouseclicked.

Raycast (as in m_GraphicRaycasterUI.Raycast(m_PointerEventDataUI, results) doesn't return what UI objects are hit.

However EventSystem.current.RaycastAll(m_PointerEventDataUI, results); does. But I'd like to avoid the performance hit cos don't need to know 3D objects hit.

Any tips much appreciatd

Cheers, Sergio

My UI hierarchy is:
- Main Canvas (vertical layout group, Canvas and Graphic Raycaster components)

- Header
- Bottom Canvas (Canvas and Graphic Raycaster components)

- Object with Horizontal Layout Group element

- UI Object
- UI Object (Vertical Layout Group)

- UI Object
- UI Object
- UI Object​

I don't get any results of what UI objects were hit (but I get the mouse click position) with:

Code (CSharp):

1. if(Input.GetMouseButtonDown(0))
2.         {
3.             m_PointerEventDataUI = new PointerEventData(m_EventSystemUI);
4.             m_PointerEventDataUI.position = Input.mousePosition;
5.             Debug.Log("Click at " + m_PointerEventDataUI.position);
6.             List<RaycastResult> results = new List<RaycastResult>();
7. GraphicRaycaster GraphicRaycasterUI=GetComponent<GraphicRaycaster>();//(from the Bottom Canvas)
8.             GraphicRaycasterUI.Raycast(m_PointerEventDataUI, results);
9.  
10.             foreach (RaycastResult result in results)
11.             {
12.                     Debug.Log("Touching " + result);
13.             }
14.         }

However I get all UI objects and 3D objects that were hit with this, but want to avoid the performance hit of detecting 3D objects hit cos don't need them:

Code (CSharp):

1. if(Input.GetMouseButtonDown(0))
2.         {
3.             m_PointerEventDataUI = new PointerEventData(m_EventSystemUI);
4.          m_PointerEventDataUI.position = Input.mousePosition;
5.             Debug.Log("Click at " + m_PointerEventDataUI.position);
6.             List<RaycastResult> results = new List<RaycastResult>();
7.             EventSystem.current.RaycastAll(m_PointerEventDataUI, results);
8.  
9.             foreach (RaycastResult result in results)
10.             {
11.                     Debug.Log("Touching " + result);
12.             }
13.         }