Display Markers/Waypoint Symbols in Unity

Hello,

I am currently working on a VR-Project with the HTC Vive in Unity. I Want to place some markers on objects. For that, I created a canvas with the symbol in it. The canvas render mode is in "screen space - camera". I already wrote a script.

Code (CSharp):

1.  
2. public class SymbolControll : MonoBehaviour
3. {
4.     public RawImage symbol;
5.     public Transform target;
6.     void Update()
7.     {
8.         //target behind the player
9.         if (Vector3.Dot((target.position - Camera.main.transform.position), Camera.main.transform.forward) < 0)
10.         {
11.             symbol.enabled = false;
12.         }
13.         else
14.         {          
15.             symbol.enabled = true;
16.             symbol.transform.position = Camera.main.WorldToScreenPoint(target.position);
17.         }    
18.     }
19. }
20. }

This script was working with the "normal" unity main camera. But as soon I included the Vive plugin, the symbols are not displayed anymore. I coded it after that example:

I am using Unity Ver. 2018.3.5f1.

Anyone knows the reason why it's not working anymore has a solution???