GUI position above selected Npc

Hello,
I'm trying to drag and drop a NPC into the script and have the GUI target that NPC so the dialogue appears above his head. If I have one NPC this works but as soon as I attach the script to another NPC the dialogue for both NPC appear above the second NPC's head. I know this should be simple and have tried a few ways that should fix this issue.

Code (CSharp):

1.    public Transform GUIBackGround;
2.     public Transform NPCCharacter;
3.  
4.     void Start () {
5.  
6.     }
7.  
8.     void Update () {
9.         Vector3 Pos = Camera.main.WorldToScreenPoint(NPCCharacter.position);
10.         Pos.y += 175;
11.         GUIBackGround.position = Pos;
12. }
13.  

 

Is GUIBackGround referencing the same transform on both NPC's?

 

Yeah GUIBackGround is referencing the GUI canvas for the dialogue system in the Heirarchy that both NPC's are using for the Dialogue.

 

So the way the script is written, whichever runs update last will set GUIBackGround.position to that character's position. You're going to need a way to have your UI object handle multiple positions at the same time. The way I do it is have a UI window for each NPC instead of a shared one, but there is certainly ways to use a shared UI object instead (but not this way).

 

I was thinking of having the UI switch to the NPC that is currently active. Well is what I'm trying to go for. JAny idea how I would go about coding that in?