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Question by camtronius · Apr 22, 2014 at 04:17 AM · rtshealthbarworldtoscreenpoint2dtexture

Getting the 2d coordinates of an object

Hey guys, I have a 3d cylinder object called "Tower" and I am trying to create a 2d rectangle health bar above it. I am trying to use

 Vector3 screenPos = Camera.WorldToScreenPoint(target.position);

to get the 2d coordinates of my "Tower" which i will then use to draw a rectangle at that position. Can someone help me? Where I do put in the tower object? How do I get the coordinates of my tower object? Thanks,

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Answer by zharik86 · Apr 22, 2014 at 07:08 AM

For determination of coordinates on the screen you use function WorldToScreenPoint(). But don't forget that it gives pivot point coordinates. In your case - the cylinder center. Furtherfor the health bar display, you can use either GUITexture, or GUIElements inOnGUI(). I wrote GUITexture example below (attach this script at your tower):

  public GUITexture myhb = null; //your health bar for tower
  
  void Start() {
   setPosScr();
  }

  void Update() {
   setPosScr();
  }

  public void setPosScr() {
   Vector3 screenPos = Camera.WorldToScreenPoint(this.transform.position);
   myhb.pixelInset = new Rect(screenPos.x, Screen.height - screenPos.y, myhb.pixelInset.width, mybh.PixelInset.height);
  }

If you will use GUIElement tnen see my pregoing response

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Answer by Burla · Apr 22, 2014 at 06:44 AM

You can access its position by doing this.

 Vector3 towerPos = GameObject.Find("Tower").transform.position;

I guess the tower's position doesn't change, so you could easily do this in the Start() function, so you don't keep calling the search function which takes a lot of useage of the device.

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