Get Position and Size of GameObject in pixels and then crop a screenshot

Hi all,

Im using Vuforia AR

I intent to take a screenshot for a number (Barcode - OCR code) from a specific place in the screen, i create a Plane gameobject for use like a marker.

This is my code for the momment for find the Plane in screen and then take a screenshot:

 private void TakeScreenShot()
     {
         Vector3 screenPos = Camera.main.WorldToScreenPoint(ocrCropGrid.GetComponent<Transform>().position);
 
         Bounds ocrBounds = ocrCropGrid.GetComponent<Renderer>().bounds;
 
         Vector3 posStart = Camera.main.WorldToScreenPoint(new Vector3(ocrBounds.min.x, ocrBounds.min.y, ocrBounds.min.z));
         Vector3 posEnd = Camera.main.WorldToScreenPoint(new Vector3(ocrBounds.max.x, ocrBounds.max.y, ocrBounds.min.z));
 
         Debug.Log("posStart:" + posStart);
         Debug.Log("posEnd:" + posEnd);
 
         int widthX = (int)(posEnd.x - posStart.x);
         int widthY = (int)(posEnd.y - posStart.y);
 
         Debug.Log("widthX:" + widthX);
         Debug.Log("widthY:" + widthY);
 
         screenShotOCRCode.ReadPixels(new Rect(screenPos.x - (widthX / 2), screenPos.y - (widthY / 2), widthX, widthY),  0, 0);
         screenShotOCRCode.Apply();
 
         //SAVE SCREENSHOT
         byte[] image = screenShotOCRCode.EncodeToJPG();
         File.WriteAllBytes(Application.dataPath + "/../Screenshots/CardOCR.jpg", image);
 
         Debug.Log("Screenshot Saved");
     }

 

The problem is the position, the X (screenPos.x) position not match camera the Y (screenPos.y) is fine with a common. And with vuforia camera the screenshots go wrong

Any help is appreciated.

Sorry for my english.