Legacy Documentation: Version 2018.2 (Go to current version)
LanguageEnglish
  • C#

GraphicRaycaster.Raycast

Suggest a change

Success!

Thank you for helping us improve the quality of Unity Documentation. Although we cannot accept all submissions, we do read each suggested change from our users and will make updates where applicable.

Close

Submission failed

For some reason your suggested change could not be submitted. Please <a>try again</a> in a few minutes. And thank you for taking the time to help us improve the quality of Unity Documentation.

Close

Cancel

public void Raycast(EventSystems.PointerEventData eventData, List<RaycastResult> resultAppendList);

Description

Determines if the cursor is over a Graphics element in the Scene. See: BaseRaycaster.

Use this to determine if the cursor is over a Graphics element in the Scene. It accepts the mouse pointer event data as a parameter. Make sure you have an EventSystem in your hierarchy. If you don’t, go to Create >UI >Event System. Some common uses of this include: setting up your own custom UI system; telling when you hover over Text or Images which aren’t automatically selectable; UI click and drag operations; and many more.

//Attach this script to your Canvas GameObject.
//Also attach a GraphicsRaycaster component to your canvas by clicking the Add Component button in the Inspector window.
//Also make sure you have an EventSystem in your hierarchy.

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

public class GraphicRaycasterRaycasterExample : MonoBehaviour { GraphicRaycaster m_Raycaster; PointerEventData m_PointerEventData; EventSystem m_EventSystem;

void Start() { //Fetch the Raycaster from the GameObject (the Canvas) m_Raycaster = GetComponent<GraphicRaycaster>(); //Fetch the Event System from the Scene m_EventSystem = GetComponent<EventSystem>(); }

void Update() { //Check if the left Mouse button is clicked if (Input.GetKey(KeyCode.Mouse0)) { //Set up the new Pointer Event m_PointerEventData = new PointerEventData(m_EventSystem); //Set the Pointer Event Position to that of the mouse position m_PointerEventData.position = Input.mousePosition;

//Create a list of Raycast Results List<RaycastResult> results = new List<RaycastResult>();

//Raycast using the Graphics Raycaster and mouse click position m_Raycaster.Raycast(m_PointerEventData, results);

//For every result returned, output the name of the GameObject on the Canvas hit by the Ray foreach (RaycastResult result in results) { Debug.Log("Hit " + result.gameObject.name); } } } }

Did you find this page useful? Please give it a rating: