VRTK UI doesn't work after load scene

I was having the same problem. I was able to resolve it by adding the EventSystem GameObject, that gets auto generated when you add a canvas, to the scene.,I was Having the same Issue, I was able to resolve it by adding an EventSystem object, that gets auto generated when you add a Canvas, into the scene.

I had the same problem and after a quick chat on the VRTK Slack I was told that it is related to the Unity EventSystem being disabled and not working properly. I managed to get it work with this script.

 using System.Collections;
 using UnityEngine;
 using UnityEngine.EventSystems;
 using VRTK;
     
 public class MenuFix : MonoBehaviour
 {
     public GameObject EventSystem;
     public VRTK_UIPointer PointerController;
 
     private VRTK_VRInputModule[] inputModule;
 
     private void Start()
     {
         StartCoroutine(LateStart(1));
     }
 
     private void Update()
     {
         if (inputModule != null)
         {
             if (inputModule.Length > 0)
             {
                 inputModule[0].enabled = true;
                 if (inputModule[0].pointers.Count == 0)
                     inputModule[0].pointers.Add(PointerController);
             }
             else
                 inputModule = EventSystem.GetComponents<VRTK_VRInputModule>();
         }
     }
 
     IEnumerator LateStart(float waitTime)
     {
         yield return new WaitForSeconds(waitTime);
         EventSystem.SetActive(true);
         EventSystem.GetComponent<EventSystem>().enabled = false;
         inputModule = EventSystem.GetComponents<VRTK_VRInputModule>();
     }
 }

As you can see, you also have to repopulate the VRTK_VR Input Module component yourself. The PointerController GameObject is my controller with the VRTK_UIPointer component attached to it. The input module is in an array because I have got some issues where sometimes VRTK generate multiple ones in the EventSystem when I enable it. Hope it helps!

I am also having this issue. I will let you know if I find a solution. When running the scene by itself the UI works fine, however if the scene is loaded it no longer works.

@scarffy

Also still having this exact issue, UI Pointer works fine on first scene, but stops working after any scene load using SceneManager.LoadScene, even if it's the exact same scene.

• I've been using the latest version of VRTK 3.2.1 for this project.

• I've tried adding 'VRTK_SDKManager.instance.enabled=false;' into script before switching scenes, same results.

• I've tried adding 'VRTK_SDKManager.instance.enabled=false; VRTK_SDKManager.instance.enabled=true;' into script when new scene loads, same results

• I've tried disabling/enabling the canvas itself on scene start.

• I've tried updating Unity to 2017.3.0, same results.

  ---

It seems to be some kind of issue with the UI Pointer raycast. I have a script that toggles the straight pointer visibility on/off based on the pointers raycast hitting a canvas object, which no longer works after a scene load.

This is a crucial aspect of the game I'm building, any help would be greatly appreciated. I'll be sure to post any results that I come across.

If you disable and enable the VRTK_UI Canvas script (after enabling the UI and the Event handler) it starts working again.