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    public enum CrouchToggleAction
    {
        DoNothing,
        DoStanding,
        DoCrouching
    }
    public class Croucher : MonoBehaviour
    {
        private CrouchToggleAction toggleAction;
        public CrouchToggleAction ToggleAction
        {
            get { return toggleAction; }
            set { toggleAction = value; }
        }
        public float toggleActionSpeed;
        private PlayerMotor playerMotor;
        private CharacterController controller;
        private float crouchHeight;
        private float standHeight;

        private void Start()
        {
            playerMotor = GetComponent<PlayerMotor>();
            controller = GetComponent<CharacterController>();
            standHeight = playerMotor.standingHeight;
            crouchHeight = playerMotor.crouchingHeight;
            toggleAction = CrouchToggleAction.DoNothing;
            toggleActionSpeed = 12f;
        }

        // perform whatever action CrouchToggleAction is set to.
        private void Update()
        {
            if (toggleAction == CrouchToggleAction.DoNothing)
                return;

            bool bFinished = false;

            if (toggleAction != CrouchToggleAction.DoNothing)
            {
                float changePerUpdate = toggleActionSpeed * Time.deltaTime;
                if (toggleAction == CrouchToggleAction.DoCrouching)
                    changePerUpdate = -1 * changePerUpdate; // reverse direction

                controller.height = Mathf.Clamp(controller.height + changePerUpdate, crouchHeight, standHeight);

                controller.transform.position += new Vector3(0, changePerUpdate / 2.0f);
                if (toggleAction == CrouchToggleAction.DoCrouching)
                    bFinished = (controller.height <= crouchHeight);
                else
                    bFinished = (controller.height >= standHeight);
            }

            if (bFinished)
            {
                //Debug.Log("Controller.height = " + controller.height);
                Debug.Log("Controller.transform.position.y" + controller.transform.position.y);

                toggleAction = CrouchToggleAction.DoNothing;
            }
        }
    }