即席スクリプト。 Cameraオブジェクトにセットすれば、CatchShakeメソッドをコールした時、地震みたくなる。 移動しながらの振動はNG。

ShakeCamera.cs

using UnityEngine;
using System.Collections;
 
public class ShakeCamera : MonoBehaviour {
  public float setShakeTIme; // 持続振動時間
 
  private float lifeTime;
  private Vector3 savePosition;
  private float lowRangeX;
  private float maxRangeX;
  private float lowRangeY; 
  private float maxRangeY;
 
  void CatchShake() {
    savePosition = transform.position;
    lowRangeY = savePosition.y - 1.0f;
    maxRangeY = savePosition.y + 1.0f;
    lowRangeX = savePosition.x - 1.0f;
    maxRangeX = savePosition.x + 1.0f;
    lifeTime = setShakeTIme;
  }
 
  void Start () {
   if(setShakeTIme <= 0.0f)
     setShakeTIme = 0.7f;
   lifeTime = 0.0f;
  }	
 
  void Update () {
    if(lifeTime < 0.0f){
      transform.position = savePosition;
      lifeTime = 0.0f;
    }
 
    if(lifeTime > 0.0f){
      lifeTime -= Time.deltaTime;
      float x_val = Random.Range(lowRangeX,maxRangeX);
      float y_val = Random.Range(lowRangeY,maxRangeY);
      transform.position = new Vector3(x_val,y_val,transform.position.z);
    }
 
    if(Input.GetKeyDown("space"))
      CatchShake();
  }
}