EventTrigger on 3D object not working ?

Hi @BudyDubby, I know this is an old thread but I am just posting an answer now as this question pops first on the google search for the same thing I faced and overcame.

Now Raycast would be a solution to this, but I feel it is more like an overkill for triggering events on 3D objects.

So to answer your question, you need to add a collider on your 3D object like a Box, sphere or Capsule according to the shape of your object. You may even add a combination of these colliders to have a complex compound of colliders to get event triggers on specific colliders for specific tasks.

So your script seems fine, once you add a collider, your 3D object should trigger corresponding events.

Hope it helps anyone who lands on this question. :)

okay, i give up using Event.System on 3D object instead i'm using raycast for Select and Deselect objects, here my script, i hope its will help community

 using UnityEngine;
 using System.Collections;
 
 namespace SelectionManager
 {
     public class SelectingObject : MonoBehaviour
     {    
         public LoadInfo loadInfoClass;
 
         // color of highlighted object
         public Color highlightedColor = Color.cyan;
 
         // color of selected object
         public Color selectedColor = Color.blue;
 
         // variable to store highlighted gameobject
         GameObject highlightedGO = null;
 
         // variable to store selected gameobject
         GameObject selectedGO = null;
         
         // variable to store initial color of highlighted gameobject
         Color initColor;
 
         // variable to store initial color of selected gameobject
         Color initColorSelected;
 
         Vector3 lastMousePosition;
 
         void HighlightingGO ()
         {
             Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
             RaycastHit hit;
             
             if (Physics.Raycast(ray, out hit))
             {
                 /// HIGHLIGHT OBJECT WHEN MOUSE HOVER
                 /// -------------------------------------------------------------------------------------
                 if (hit.collider.gameObject != highlightedGO && hit.collider.gameObject != selectedGO)
                 {
                     if (highlightedGO != null)
                         ResetHighlightedGO();
                     
                     // add highlighted object to highlightedGO
                     highlightedGO = hit.collider.gameObject;
                     
                     // get initial color of highlightedGO
                     initColor = highlightedGO.GetComponent<Renderer>().material.color;
                     
                     // change color of highlightedGO to show highlight effect
                     highlightedGO.GetComponent<Renderer>().material.color = highlightedColor;
                 }
 
                 /// SELECTING OBJECT WITH LEFT CLICK BUTTON
                 /// -------------------------------------------------------------------------------------
                 if (Input.GetMouseButtonDown (0)) {
                     lastMousePosition = Input.mousePosition;
                 }
                 
                 // if mouse is clicked
                 if (Input.GetMouseButtonUp(0) && Input.mousePosition == lastMousePosition)
                 {
                     highlightedGO = null;
 
                     if (selectedGO != null)
                         ResetSelectedGO();
                     
                     // add selected object to selectedGO
                     selectedGO = hit.collider.gameObject;
                     
                     // get initial color of selectedGO
                     initColorSelected = initColor;
                     
                     // change color of selectedGO to show highlight effect
                     selectedGO.GetComponent<Renderer>().material.color = selectedColor;
 
                     // show selected object info on side panel
                     loadInfoClass.ShowDescription(selectedGO.name);
 
                     print ("selectedGO is: " + selectedGO);
                 }
             }
             else
             {
                 if (Input.GetMouseButtonDown (0))
                 {
                     lastMousePosition = Input.mousePosition;
                 }
                 
                 // if mouse is clicked
                 if (Input.GetMouseButtonUp(0) && Input.mousePosition == lastMousePosition)
                 {
                     ResetSelectedGO ();
                 }
     
                 // if user exiting highlightedGO, reset highlightedGO color to initial
                 ResetHighlightedGO ();
             }
         }
         
         void ResetHighlightedGO ()
         {    
             if (highlightedGO == null)
                 return;
 
             highlightedGO.GetComponent<Renderer>().material.color = initColor;
             highlightedGO = null;
         }
 
         void ResetSelectedGO ()
         {
             if (selectedGO == null)
                 return;
 
             selectedGO.GetComponent<Renderer>().material.color = initColorSelected;
             selectedGO = null;
         }
         
         void Update ()
         {
             HighlightingGO();
         }
     }
 }