Multiple canvases and graphic raycasters

Questions & Answers
1

Hi, I have a need for multiple canvases in my project (and thus multiple graphic raycasters). One is an overlay canvas, and the other is a camera space canvas. Currently only one canvas can detect input, the camera space canvas. If I disabled the camera space canvas’s graphic raycaster, the overlay one can detect input, but on the contrary, the camera space canvas couldn’t. The camera space canvas is needed to detect a 2D object that will behave like a button in the game. While the overlay is needed to detect the rest of the gui (menu, HUD, etc). So, how do I fix this? Thanks.

2

Don’t know if this will help but it should report back all layers it passes through. I had it setup to act on a key press but no reason you couldn’t use the top canvas OnClick to start the routine and report what it’s gone through.

using UnityEngine;
using UnityEngine.EventSystems;
using System.Collections;
using System.Collections.Generic;

public class RaycastUI : MonoBehaviour {

	public void RayCastingToUI ()
	{
		PointerEventData PED = new PointerEventData(EventSystem.current);
		PED.position =  Input.mousePosition;

		List<RaycastResult> HITS = new List<RaycastResult>();
		EventSystem.current.RaycastAll( PED, HITS );

		foreach(RaycastResult hit in HITS)
		{
			GameObject go = hit.gameObject;
			Debug.Log (go.name + " how many hit = " + HITS.Count);
		}
	}
}