UI Image Follow GameObject

Hey!
Im trying to make an FPS shooter game were the player can scan the area and find different types of object (No man's sky style). And I have this script attached to the UI Image (Icon) that is a child of my canvas.

Now the UI Image is following the GameObject perfectly. But whenever I turn away 180 degrees from the GameObject, It seems like the UI Image is located at the opposite side too (Or moves to the opposite side).

Any help?
Thanks!

Heres the code:

Code (CSharp):

1. public class TrackObject : MonoBehaviour {
2.  
3.     public GameObject Obj;
4.  
5.     Camera mCamera;
6.     private RectTransform rt;
7.     Vector2 pos;
8.  
9.     void Start ()
10.     {
11.         mCamera = GameObject.FindGameObjectWithTag ("MainCamera").GetComponent<Camera> ();
12.         rt = GetComponent<RectTransform> ();
13.     }
14.  
15.     void Update ()
16.     {
17.         if (Obj)
18.         {
19.             pos = RectTransformUtility.WorldToScreenPoint (mCamera, Obj.transform.position);
20.             rt.position = pos;
21.         }
22.         else
23.         {
24.             Debug.LogError (this.gameObject.name + ": No Object Attached (TrackObject)");
25.         }
26.          
27.  
28.     }
29. }

 

I know it is old but this can help someone

Code (CSharp):

1. void OnGUI() {  
2.         var gotransform = Obj.GetComponent<Transform>();
3.         rt.position = mCamera.WorldToScreenPoint(gotransform.position);
4.       }
5.  

https://docs.unity3d.com/ScriptReference/Camera.WorldToScreenPoint.html
https://answers.unity.com/questions/26676/can-you-make-a-guibox-follow-a-players-positionsol.html
https://forum.unity.com/threads/health-bar-over-enemy.26014/

 

Not working.The image still moves over the opposite side

 

https://docs.unity3d.com/ScriptReference/Camera.WorldToScreenPoint.html
You can use the Z component of the position you are getting from WorldToScreenPoint in order to determin if the object is infront of behind the camera.
If the z value is positive is infront of the camera and if its negative you know its behind the camera.
I personally use a canvas group to and set the alpha to 1 or 0 depending if the object is infront or behind the camera.

 

Many thanks. Your idea helped))

 

If anyone's still interested, here's a version of the code that works even if the object is behind the camera:

Code (CSharp):

1.         Vector3 targPos = Obj.transform.position;
2.         Vector3 camForward = mCamera.transform.forward;
3.         Vector3 camPos = mCamera.transform.position + camForward;
4.         float distInFrontOfCamera = Vector3.Dot(targPos - camPos, camForward);
5.         if (distInFrontOfCamera < 0f)
6.         {
7.             targPos -= camForward * distInFrontOfCamera;
8.         }
9.        pos = RectTransformUtility.WorldToScreenPoint (mCamera, targPos);
10.  

You can also clamp the resulting 'pos' to a rectangle within the screen, if you want the icon/text/whatever to hug the edge for offscreen objects.

 

Thank You Peeling! You are a life saver.