1

I want to select an object on the scene touching it on the screen.
I have made this code and it perfectly works on Unity player or when i compile the application for Windows.
When i compile for WebGL i have strange behaviours (tested on Firefox/Chrome)

The error i get is that , if i keep my finger pressed on the object, i get multile continuous click instead of a single one even if i’m using TouchPhase.Began.
Someone knows how to fix this problem? Is a known issue?

Here’s my code

using UnityEngine;
using System.Collections.Generic;
using System.Xml.XPath;
using UnityEngine.UI;


public class RaycastObjHit : MonoBehaviour
{
  
    private GameObject working_object;
    private GameObject touchedObject;
    public Canvas myCanvas;

    void Update()
    {
        if (Input.touchCount == 1 && Input.GetTouch(0).phase == TouchPhase.Began)
        {
            Ray ray = Camera.current.ScreenPointToRay(Input.GetTouch(0).position);
            RaycastHit hit;   
       
            if (Physics.Raycast(ray, out hit))
            {
                string ObjHitName = hit.transform.name;
                Debug.Log(hit.transform.name);
                if (hit.collider != null)
                {
                    touchedObject = hit.transform.gameObject;
                 
                    if (touchedObject.GetComponent<Renderer>().material.color != Color.red )
                    {
                        changeColor(touchedObject.transform.name, Color.red);   
                    }else{
                        changeColor(touchedObject.transform.name, Color.green);   
                    }
                   
                }
                    Debug.Log("Touched " + touchedObject.transform.name);
             }
         }
            
    }
    public void changeColor(string objId, Color color)
    {
        working_object = GameObject.Find(objId);
        working_object.GetComponent<Renderer>().material.color = color;
    }
}
2

You code seems right, don’t know why this is called multiple times. Maybe try to change to FixedUpdate ?

Anyway, a workaround would be using a bool to only register the first touch:

    public class RaycastObjHit : MonoBehaviour
    {

        private GameObject working_object;
        private GameObject touchedObject;
        private bool touchBegan = false;
        public Canvas myCanvas;

        void Update()
        {
            if (Input.touchCount == 1)
            {
                if (Input.GetTouch(0).phase == TouchPhase.Began && !touchBegan)
                {
                    touchBegan = true;
                    Ray ray = Camera.current.ScreenPointToRay(Input.GetTouch(0).position);
                    RaycastHit hit;

                    if (Physics.Raycast(ray, out hit))
                    {
                        string ObjHitName = hit.transform.name;
                        Debug.Log(hit.transform.name);
                        if (hit.collider != null)
                        {
                            touchedObject = hit.transform.gameObject;

                            if (touchedObject.GetComponent<Renderer>().material.color != Color.red)
                            {
                                changeColor(touchedObject.transform.name, Color.red);
                            }
                            else
                            {
                                changeColor(touchedObject.transform.name, Color.green);
                            }

                        }
                        Debug.Log("Touched " + touchedObject.transform.name);
                    }
                }
                else if (Input.GetTouch(0).phase == TouchPhase.Ended && touchBegan)
                {
                    touchBegan = false;
                }
            }
        }
    }
3

Tanx s_awali, your workaround works like a charm.
Do not know why Phase.Began do not work on my WebGL :slight_smile: