Unity第一人称FPS：为带冲刺功能的角色添加左右相机晃动效果

需求说明 #

完成Brackey的FPS移动教程并添加冲刺机制后，需要为相机添加左右侧移时的左右晃动效果（非常见的上下晃动），同时保留相机自由环顾的功能。玩家对象结构为：Player根对象下包含CharacterController、PlayerMovement脚本，以及CameraHolder子对象，相机挂载在CameraHolder下。

现有PlayerMovement代码 #

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class PlayerMovement : MonoBehaviour
{
    public CharacterController controller;

    public float speed = 12f;
    public float gravity = -9.81f;
    public float jumpHeight = 3f;
    public Camera cam;

    public int MaxFOV = 90;
    public float timeFOV = 0.03f;

    public Transform groundCheck;
    public float groundDistance = 0.4f;
    public LayerMask groundMask;

    Vector3 velocity;
    bool isGrounded;

    // Update is called once per frame
    void Update()
    {
        isGrounded = Physics.CheckSphere(groundCheck.position, groundDistance, groundMask);

        if(isGrounded && velocity.y < 0)
        {
            velocity.y = -2f;
        }

        float x = Input.GetAxis("Horizontal");
        float z = Input.GetAxis("Vertical");
        float s = Input.GetAxis("Fire3") + 1;

        if(s == 2)
        {
            cam.fieldOfView = Mathf.Lerp(cam.fieldOfView, MaxFOV, timeFOV);
        }
        else
        {
            cam.fieldOfView = Mathf.Lerp(cam.fieldOfView, 60, timeFOV);
        }

        Vector3 move = transform.right * x + transform.forward * z * s;

        controller.Move(move * speed * Time.deltaTime);

        if(Input.GetButtonDown("Jump") && isGrounded)
        {
            velocity.y = Mathf.Sqrt(jumpHeight * -2f * gravity);
        }

        velocity.y += gravity * Time.deltaTime;

        controller.Move(velocity * Time.deltaTime);
    }
}

实现方法 #

核心思路 #

通过水平移动输入值（Horizontal轴）计算相机父物体（CameraHolder）的局部X轴偏移，用平滑插值实现自然的左右晃动，同时不干扰相机的旋转环顾功能。

修改后的完整代码 #

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class PlayerMovement : MonoBehaviour
{
    public CharacterController controller;

    public float speed = 12f;
    public float gravity = -9.81f;
    public float jumpHeight = 3f;
    public Camera cam;

    public int MaxFOV = 90;
    public float timeFOV = 0.03f;

    public Transform groundCheck;
    public float groundDistance = 0.4f;
    public LayerMask groundMask;

    // 新增相机晃动控制参数
    public Transform cameraHolder; // 拖入场景中的CameraHolder对象
    public float sideWobbleAmount = 0.15f; // 晃动幅度，可按需调整
    public float wobbleSmoothSpeed = 6f; // 晃动平滑速度，避免生硬抖动
    private Vector3 originalCameraLocalPos; // 记录相机初始位置

    Vector3 velocity;
    bool isGrounded;

    void Start()
    {
        // 初始化相机初始局部位置
        originalCameraLocalPos = cameraHolder.localPosition;
    }

    // Update is called once per frame
    void Update()
    {
        isGrounded = Physics.CheckSphere(groundCheck.position, groundDistance, groundMask);

        if(isGrounded && velocity.y < 0)
        {
            velocity.y = -2f;
        }

        float x = Input.GetAxis("Horizontal");
        float z = Input.GetAxis("Vertical");
        float s = Input.GetAxis("Fire3") + 1;

        // 相机左右晃动逻辑
        // 反向偏移：左移时相机右偏，右移时左偏，符合视觉惯性
        float targetXOffset = -x * sideWobbleAmount;
        // 冲刺时可增大晃动幅度：targetXOffset = -x * sideWobbleAmount * s;
        Vector3 targetPos = originalCameraLocalPos + new Vector3(targetXOffset, 0, 0);
        // 平滑过渡到目标位置
        cameraHolder.localPosition = Vector3.Lerp(cameraHolder.localPosition, targetPos, wobbleSmoothSpeed * Time.deltaTime);

        if(s == 2)
        {
            cam.fieldOfView = Mathf.Lerp(cam.fieldOfView, MaxFOV, timeFOV);
        }
        else
        {
            cam.fieldOfView = Mathf.Lerp(cam.fieldOfView, 60, timeFOV);
        }

        Vector3 move = transform.right * x + transform.forward * z * s;

        controller.Move(move * speed * Time.deltaTime);

        if(Input.GetButtonDown("Jump") && isGrounded)
        {
            velocity.y = Mathf.Sqrt(jumpHeight * -2f * gravity);
        }

        velocity.y += gravity * Time.deltaTime;

        controller.Move(velocity * Time.deltaTime);
    }
}

自定义调整建议 #

• 若想让冲刺时晃动更强烈，可将晃动幅度的计算改为：float targetXOffset = -x * sideWobbleAmount * s;
• 调整sideWobbleAmount（幅度）和wobbleSmoothSpeed（平滑度）参数，匹配你的操作手感
• 若希望晃动带旋转效果而非纯位移，可替换位置偏移逻辑为旋转控制：

  float targetRotationY = -x * 2f; // 旋转角度，按需调整
  cameraHolder.localRotation = Quaternion.Lerp(cameraHolder.localRotation, Quaternion.Euler(0, targetRotationY, 0), wobbleSmoothSpeed * Time.deltaTime);
  

内容的提问来源于stack exchange，提问作者yesn't