unity3d 摄像机抖动效果 CameraShake

using UnityEngine;
using System.Collections;

public class CameraShake : MonoBehaviour 
{
    public Transform cameraTransform; 
    private Vector3 _currentPosition;        //记录抖动前的位置
    private float _shakeCD = 0.002f;        //抖动的频率
    private int _shakeCount = -1;            //设置抖动次数
    private float _shakeTime; 
    void Start ()
    {
        if(cameraTransform == null) cameraTransform = transform;
        
        _currentPosition = cameraTransform.position;    //记录抖动前的位置
        _shakeCount = Random.Range (50, 60);            //设置抖动次数
    } 
    void Update ()
    {
        if(_shakeTime + _shakeCD < Time.time && _shakeCount > 0)
        {
            _shakeCount --;
            float radio = Random.Range (-0.01f, 0.01f);
            
            if(_shakeCount == 1)    //抖动最后一次时设置为都动前记录的位置
                radio = 0;
            
            _shakeTime = Time.time;
            cameraTransform.position = _currentPosition + Vector3.one * radio;
        }
    }
}