void Start()
        {
            leftBarrel        = LeftCamera.GetComponent <BarrelDistortion>();
            rightBarrel       = RightCamera.GetComponent <BarrelDistortion>();
            centerCullingMask = CenterCamera.cullingMask;
            arVideo           = CenterCamera.GetComponent <UnityARVideo>();


            HoloKitCalibration.LoadDefaultCalibration(this);
            UpdateProjectMatrix();
        }
        void Start()
        {
            leftBarrel        = LeftCamera.GetComponent <BarrelDistortion>();
            rightBarrel       = RightCamera.GetComponent <BarrelDistortion>();
            centerCullingMask = CenterCamera.cullingMask;


            HoloKitCalibration.LoadDefaultCalibration(this);
            UpdateProjectMatrix();

            rectTexture = new Texture2D(1, 1);
            rectTexture.SetPixel(0, 0, Color.black);
            rectTexture.Apply();
            rectStyle = new GUIStyle();
            rectStyle.normal.background = rectTexture;
        }