注意

1. GetAxisRaw 和 GetAxis的区别：前者更好控制，后者按下后会从0过度到1或-1，比较平滑
2. 鼠标左右移动，角色以自身y轴旋转，子物体摄像机跟随；鼠标上下移动，摄像机以自身x周旋转

ps：通过代码赋值，赋值在Awake中实现，但是需要注意”Camera”这个游戏对象名称

截图

PlayerInput

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

public class PlayerInput : MonoBehaviour {

    [SerializeField]
    private float speed = 5f;
    [SerializeField]
    private float lookSensitivity = 8f;

    private PlayerController controller;

    void Awake() {
        controller = gameObject.GetComponent<PlayerController>();  
        // 隐藏鼠标
        Cursor.lockState = CursorLockMode.Locked;      
    }

    // Update is called once per frame
    void Update() {

        float xMov = Input.GetAxisRaw("Horizontal");
        float yMov = Input.GetAxisRaw("Vertical");

        Vector3 velocity = (transform.right * xMov + transform.forward * yMov).normalized * speed;
        controller.Move(velocity);

        float xMouse = Input.GetAxisRaw("Mouse X");
        float yMouse = Input.GetAxisRaw("Mouse Y");

        Vector3 yRotation = new Vector3(0f, xMouse, 0f) * lookSensitivity;
        Vector3 xRotation = new Vector3(-yMouse, 0f, 0f) * lookSensitivity;
        controller.Rotate(yRotation, xRotation);
    }
}

PlayerController

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

public class PlayerController : MonoBehaviour {

    private Rigidbody rb;
    private Camera cam;

    private Vector3 velocity = Vector3.zero;  // 移动速度
    private Vector3 yRotation = Vector3.zero; // 人物旋转
    private Vector3 xRotation = Vector3.zero; // 相机旋转


    void Awake() {
        rb = gameObject.GetComponent<Rigidbody>();
        // 这里只是获取了相机gameObject下的Camera组件，而不是相机gameObject，在第二次课中还需要gameObject下的ClientNetwork，不然客户端没办法通过鼠标左右操作摄像机视角
        cam = GameObject.Find("Camera").GetComponent<Camera>();
    }

    private void FixedUpdate() {
        PerformMovement();
        PerformRotation();
    }

    public void Move(Vector3 _velocity) {
        velocity = _velocity;
    }

    private void PerformMovement() {
        if(velocity != Vector3.zero) {
            rb.MovePosition(rb.position + velocity * Time.fixedDeltaTime);
        }
    }

    public void Rotate(Vector3 _yRotation, Vector3 _xRotation) {
        yRotation = _yRotation;
        xRotation = _xRotation;
    }

    private void PerformRotation() {
        if(yRotation != Vector3.zero) {
            rb.transform.Rotate(yRotation);
        }
        if(xRotation != Vector3.zero) {
            cam.transform.Rotate(xRotation);
        }
    }
}