Simple camera shake script for Unity3d

CameraShake.cs

using UnityEngine;
using System.Collections;

public class CameraShake : MonoBehaviour {
	Camera cam;
	public float shakeTime=0.2f;
	float timeStop=0;
	float shakeAmount=0.3f;
 	Vector3 originPosition;
	
	void Start () {
	 	cam = Camera.main;
	 	
	}
	
	public void shakeNow(){
		originPosition = cam.transform.position;
		timeStop = Time.time + shakeTime;
	
	}
	
	// Update is called once per frame
	void Update () {
		if(Time.time < timeStop){
			cam.transform.localPosition = originPosition + Random.insideUnitSphere * shakeAmount;
		}
	}
}