Rest.Update C# (CSharp) Method

    void Update()
    {
        if (gameObject.activeSelf)
        {
            float pulse = 0.5f + amplitude * (Mathf.PingPong (Time.time, frequency) / frequency);
            fixationCross.localScale = new Vector3(pulse, pulse, 0f);

            if ((Time.time - startTime) >= duration)
            {
                gameObject.SetActive (false);
                menu.nextStage();
            }
        }
    }