UnityEngine.Camera.ViewportToScreenPoint C# (CSharp) Method

        public Vector3 ViewportToScreenPoint(Vector3 position)
        {
            Vector3 vector;
            INTERNAL_CALL_ViewportToScreenPoint(this, ref position, out vector);
            return vector;
        }

    // Use this for initialization
    void Start()
    {
        // Try default camera
        cameraObject = GameObject.Find("Camera");
        myCamera = (Camera) cameraObject.GetComponent("Camera");

        planeSize = myCamera.ViewportToScreenPoint(this.transform.position);
        planeSize.x -= Screen.width;
        planeSize.y -= Screen.height;
    }