void OnTriggerExit(Collider collider)
    {
        PowerSourceController psc = collider.GetComponent <PowerSourceController>();

        if (psc != null)
        {
            m_InteractingPowerSource = null;
        }
    }
    void OnTriggerEnter(Collider collider)
    {
        PowerSourceController psc = collider.GetComponent <PowerSourceController>();

        if (psc != null)
        {
            //Debug.Log (psc);
            m_InteractingPowerSource = psc;
        }
    }