public CameraShakeEffect ShakeEffect(string prefabName, Vector3 pos, float strength = 1, float max_strength = 20, float delayTime = 0, float lifeTime = 5)
{
CameraShakeEffect se = m_Controller.AddEffect(prefabName) as CameraShakeEffect;
se.m_Multiplier = Mathf.Clamp(strength * 150 / (pos - camPosition).sqrMagnitude, 0, max_strength);
se.Invoke("Shake", delayTime);
DestroyTimer dt = se.GetComponent <DestroyTimer>();
dt.m_LifeTime = lifeTime;
return(se);
}