完整的第三人称漫游效果代码

完整的第三人称漫游效果需要使用游戏引擎的支持，比如Unity或者Unreal Engine等。以下是在Unity游戏引擎中实现第三人称漫游效果的示例代码：

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

public class ThirdPersonCamera : MonoBehaviour
{
    public float mouseSensitivity = 10;
    public Transform target;
    public float distanceFromTarget = 2;
    public Vector2 pitchMinMax = new Vector2(-40, 85);

    public float rotationSmoothTime = 0.12f;
    Vector3 rotationSmoothVelocity;
    Vector3 currentRotation;

    float yaw;
    float pitch;

    void LateUpdate()
    {
        yaw += Input.GetAxis("Mouse X") * mouseSensitivity;
        pitch -= Input.GetAxis("Mouse Y") * mouseSensitivity;
        pitch = Mathf.Clamp(pitch, pitchMinMax.x, pitchMinMax.y);

        currentRotation = Vector3.SmoothDamp(currentRotation, new Vector3(pitch, yaw), ref rotationSmoothVelocity, rotationSmoothTime);
        transform.eulerAngles = currentRotation;

        transform.position = target.position - transform.forward * distanceFromTarget;
    }
}

此代码会将摄像头追踪一个目标物体，并且通过鼠标控制旋转视角。在实现第三人称漫游效果时，需要在目标物体上添加一个脚本来控制其移动和动作，同时摄像头跟随目标物体的移动和旋转。