unity3d FPS 枪的后座力

实现枪开枪后, 向上偏移一段距离，再缓慢下移复位(模仿cs)

调小后座力

using UnityEngine;
using System.Collections;

public class Camera2Follower : MonoBehaviour {
    // 枪cd计时器
    float timer;

    // 后座力 之前枪摄像头的角度
    Vector3 s_pre_euler;
    public float gun_end_force = 0.53f; // 枪后座力大小 （可以先调大些方便调试）
    void Update ()
    {
         ....
         timer += Time.deltaTime;
          if (Input.GetButton("Fire1") && timer >= 0.15)
          {
              // 计时器清零
              timer = 0f;
              s_pre_euler = transform.eulerAngles;
              // 后座力
              rotationY += Input.GetAxis("Mouse Y") * sensitivityY + gun_end_force;
              Quaternion yQuaternion2 = Quaternion.AngleAxis(rotationY, Vector3.left);
              transform.localRotation = originalRotation * yQuaternion2;

          }

          // 检测鼠标有没有移动
          if (Input.GetAxis("Mouse Y") != 0)
          {
              //Debug.Log("X: " + transform.eulerAngles);
              s_pre_euler = transform.eulerAngles;
              rotationY += Input.GetAxis("Mouse Y") * sensitivityY;
              rotationY = ClampAngle(rotationY, minimumY, maximumY);

              Quaternion yQuaternion = Quaternion.AngleAxis(rotationY, Vector3.left);
              transform.localRotation = originalRotation * yQuaternion;
          }
          else
          {
              recoverGun();
          }
    }

    // 恢复后座力以前的位置
    void recoverGun() {
        s_pre_euler.y = transform.eulerAngles.y;
        Quaternion current_cam = Quaternion.Euler(transform.eulerAngles);
        Quaternion target_cam = Quaternion.Euler(s_pre_euler);
        transform.eulerAngles = Quaternion.Slerp(current_cam, target_cam, 5 * Time.deltaTime).eulerAngles;
    }

    void Start ()
    {
        s_pre_euler = transform.eulerAngles;
    }

    // 限制角度
    public static float ClampAngle (float angle, float min, float max)
    {
        if (angle < -360F)
            angle += 360F;
        if (angle > 360F)
            angle -= 360F;
        return Mathf.Clamp (angle, min, max);
    }
}

看了一下cs的枪后座力 发现还有左右抖动，于是又加了点代码

y_angle_mat = xxxxxxxx;    // 上下方向
....
// 在枪开火的方法区加
float xAngle = Random.Range(0.0f,1.0f);
Quaternion x_angle_mat = Quaternion.AngleAxis(xAngle, Vector3.up);
transform.localRotation = originalRotation * y_angle_mat * x_angle_mat;                  // 相当于乘以一个矩阵