UI element showing even if not in view using WorldToScreenPoint

Unity Engine
,
1

I wrote this rough script to place a ui element which is a box at the position of the target it works fine but when i get past the target and its not in the view it still projects the ui element on the screen any way to fix this or a better solution to this?

public class rdrtst : MonoBehaviour
{

    public RectTransform targetUi;
    public GameObject target;
    Vector3 targetVectorPosition;

    // Update is called once per frame
    void Update()
    {
        targetVectorPosition = target.transform.position;
        targetVectorPosition = Camera.main.WorldToScreenPoint(targetVectorPosition);
        targetUi.transform.position = targetVectorPosition;
    }
}

In view

Not in view(should not be visible)

1 Like
2

Make a Debug.Log and let it print the screen position. If z component is negative (not sure) when object is behind camera you could check for that.
If that does not work check this .

1 Like
3

Thanks the calculating based on z component was buggy but the with angle calculation it works pretty well

public class rdrtst : MonoBehaviour
{

    public RectTransform targetUi;
     public GameObject target;
    public GameObject Player;
    Vector3 targetVectorPosition;

    // Update is called once per frame
    void Update()
    {
        Vector3 targetVector = target.transform.position - Player.transform.position;

        Vector3 playerForward = Player.transform.forward;

        float angle = Vector3.Angle(playerForward, targetVector);


        if(angle<45)
        {
            targetVectorPosition = target.transform.position;
            targetVectorPosition = Camera.main.WorldToScreenPoint(targetVectorPosition);

            targetUi.GetComponent<Image>().enabled = true;
            targetUi.position = targetVectorPosition;

        }
        else
        {
            targetUi.GetComponent<Image>().enabled = false;

        }

    }
}
1 Like