private void OnButtonDown(ControllerInputManager.Button button)
    {
        // Rotate to normal horizontal with R3:
        if (button == ControllerInputManager.Button.R3)
        {
            StartCoroutine(RotateToHorizon(0.5f));
        }

        // Video Controls:
        if (button == ControllerInputManager.Button.START)
        {
            if (_immersifyPlugin.IsPaused() == true)
            {
                // Resume video and audio:
                _immersifyPlugin.Resume();
            }
            else
            {
                // Pause video and audio:
                _immersifyPlugin.Pause();
            }
        }
        else if (button == ControllerInputManager.Button.A)
        {
            _immersifyPlugin.ToggleFadedPlayPause(false, 2);
        }
        else if (button == ControllerInputManager.Button.B)
        {
            _immersifyPlugin.ToggleFadedPlayPause(true, 2);
        }
    }
        private void OnButtonDown(ControllerInputManager.Button button)
        {
            if (_mode == ControlMode.WORLD)
            {
                // Rotate to normal horizontal with R3:
                if (button == ControllerInputManager.Button.R3)
                {
                    StartCoroutine(RotateToHorizon(0.5f));
                }

                // Switch between ViewPoints with the R1 / L1 Buttons
                // TODO...

                // TODO: Use a button to switch between day and night... (rotate Directional light).
            }
            else if (_mode == ControlMode.UI)
            {
                // TODO: Maybe some ui input want to work with buttons (e.g. a bool toggle, press x to enable and disable it).
            }

            // Change controller mode:
            if (button == ControllerInputManager.Button.START)
            {
                if (_mode == ControlMode.WORLD)
                {
                    _mode = ControlMode.UI;

                    _stereoMgr.EnableUi(true);
                }
                else if (_mode == ControlMode.UI)
                {
                    _mode = ControlMode.WORLD;

                    _stereoMgr.EnableUi(false);
                }
            }
        }