Camera Shake

CameraShake.cs

using UnityEngine;
using System.Collections;

public class CameraShake : MonoBehaviour
{

  public static CameraShake instance;

  private Vector3 _originalPos;
  private float _timeAtCurrentFrame;
  private float _timeAtLastFrame;
  private float _fakeDelta;

  void Awake()
  {
    instance = this;
  }

  void Update()
  {
    // Calculate a fake delta time, so we can Shake while game is paused.
    _timeAtCurrentFrame = Time.realtimeSinceStartup;
    _fakeDelta = _timeAtCurrentFrame - _timeAtLastFrame;
    _timeAtLastFrame = _timeAtCurrentFrame;
  }

  public static void Shake(float duration, float amount)
  {
    instance._originalPos = instance.gameObject.transform.localPosition;
    instance.StopAllCoroutines();
    instance.StartCoroutine(instance.cShake(duration, amount));
  }

  public IEnumerator cShake(float duration, float amount)
  {
    float endTime = Time.time + duration;

    while (duration > 0)
    {
      transform.localPosition = _originalPos + Random.insideUnitSphere * amount;

      duration -= _fakeDelta;

      yield return null;
    }

    transform.localPosition = _originalPos;
  }
}