创建一个可以自由移动的第一人称视角

人物通过WSAD进行前后左右移动，通过鼠标右键进行旋转

Step1:创建一个Player玩家，在节点下加两个子物体，一个摄像头和一个Capsule充当身体

Step2:创建一个脚本挂载在Player节点下，再在这个Player物体下加上Character Controller脚本

Step3:该脚本内容如下

using UnityEngine;

/// <summary>
/// 人物移动脚本
/// 直接引用Character的Move方法
/// </summary>
public class PlayerMove : MonoBehaviour
{
    //键盘
    public float speed = 30F;
    public float jumpSpeed = 5.0F;
    public float gravity = 5.0F;
    private Vector3 moveDirection;
    private CharacterController characterController;

    //鼠标
    public float mousespeed = 3f;
    public float minmouseY = -45f;
    public float maxmouseY = 45f;
    public Transform playerCamera;

    private Vector3 oldMousePos;
    private Vector3 newMousePos;

    private void OnEnable()
    {
        characterController = GetComponent<CharacterController>();
    }
    private void FixedUpdate()
    {
        if (Input.GetMouseButton(1))
        {
            //把当前右键鼠标点的位置先存储起来
            newMousePos = Input.mousePosition;

            //再把每一帧刚开始的位置和上一帧的位置做一个差值
            Vector3 dis = newMousePos - oldMousePos;

            //X，Y方向上位移的距离就是这个差值的x，y分量*鼠标移动速度
            float angleX = dis.x * mousespeed;
            float angleY = dis.y * mousespeed;

            //然后再根据分量差值进行旋转
            transform.Rotate(new Vector3(-angleY, 0, 0), Space.Self);
            transform.Rotate(new Vector3(0, angleX, 0), Space.World);
        }

        if(characterController.isGrounded)
        {
            moveDirection = new Vector3(Input.GetAxis("Horizontal"), 0, Input.GetAxis("Vertical"));
            moveDirection = transform.TransformDirection(moveDirection);
            moveDirection *= speed;

            if (Input.GetButton("Jump"))
            {
                moveDirection.y = jumpSpeed;
            }
        }
        moveDirection.y = moveDirection.y - gravity * Time.deltaTime;

        //使用characterController的Move方法对物体进行移动，参数就是移动方向 * 时间
        characterController.Move(moveDirection * Time.deltaTime);

        //更新鼠标的下一帧位置
        oldMousePos = Input.mousePosition;
    }
}

运行即可