Character Controller组件

官方文档：https://docs.unity.cn/cn/2019.4/Manual/class-CharacterController.html

1. 移动

直接上代码：

public class PlayerController : MonoBehaviour
{
    //获取组件
    public CharacterController characterController;

    //设置移动和跳跃速度
    public float moveSpeed;
    //定义按键输入
    public float getHorizontal, getVertical;
    //定义移动向量
    private Vector3 dir;

    private void Start()
    {
        moveSpeed = 4;  
        characterController = GetComponent<CharacterController>();
    }

    private void Update()
    {
        getHorizontal = Input.GetAxis("Horizontal") * moveSpeed;
        getVertical = Input.GetAxis("Vertical") * moveSpeed;

        dir = transform.forward * getVertical + transform.right * getHorizontal;

        characterController.Move(dir * Time.deltaTime);
    }
}

2. 重力和跳跃

2.1 重力

• 定义重力、向下的速度（通过计算得出）
• 判断物体是否在地面上，不在时开始计算向下的速度
• 通过physics.CheckSphere方法判断物体是否在地面上
• 需要定义目标点transform、检测半径float、检测图层LayerMask来进行判断
  代码：

public class PlayerController : MonoBehaviour
{
    //定义重力和下落加速度
    public float gravity = 9.8f;
    private Vector3 velocity = Vector3.zero;

    //定义bool值判断角色是否在地面上
    public bool isGround;

    //定义一个目标点，一个检测半径，一个检测图层
    public Transform checkGround;
    public float checkRedius;
    public LayerMask checkLayer;

    private void Start()
    {
        checkRedius = 0.2f;
    }

    private void Update()
    {
        isGround = Physics.CheckSphere(checkGround.position, checkRedius, checkLayer);
        if (isGround && isJumping < 0.1)
        {
            velocity.y = 0;
        }

        velocity.y -= gravity * Time.deltaTime;
        characterController.Move(velocity * Time.deltaTime);
    }
}

2.2 跳跃

在这里遇到一个困难，如果直接用以下代码的话：

if (Input.GetButtonDown("Jump") && isGround)
{
    velocity.y = jumpSpeed;
}

理论上可行，但是通过实践发现根本跳不起来，猜测和在上一步添加重力时的这一段代码有关：

if (isGround && isJumping < 0.1)
{
    velocity.y = 0;
}

在起跳的时候程序又执行到这一部分，导致角色的velocity.y=0，从而使角色不能跳跃
暂时想到的解决办法就是添加一个计时器，让在起跳0.1秒内不再执行判断isGround的代码
通过修改后，PlayerController代码如下：

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

public class PlayerController : MonoBehaviour
{
    //获取组件
    public CharacterController characterController;

    //设置移动速度
    public float moveSpeed;
    //定义按键输入
    public float getHorizontal, getVertical;
    //定义移动向量
    private Vector3 dir;

    //定义跳跃速度和跳跃状态
    public float jumpSpeed;
    public float isJumping;
    //定义重力和下落加速度
    public float gravity = 9.8f;
    private Vector3 velocity = Vector3.zero;

    //定义bool值判断角色是否在地面上
    public bool isGround;

    //定义一个目标点，一个检测半径，一个检测图层
    public Transform checkGround;
    public float checkRedius;
    public LayerMask checkLayer;

    private void Start()
    {
        moveSpeed = 4;
        jumpSpeed = 5;
        checkRedius = 0.2f;
        characterController = GetComponent<CharacterController>();
        isJumping = 0.2f;
    }

    private void Update()
    {
        isGround = Physics.CheckSphere(checkGround.position, checkRedius, checkLayer);
        if (isGround && isJumping < 0.1)
        {
            velocity.y = 0;
        }

        getHorizontal = Input.GetAxis("Horizontal") * moveSpeed;
        getVertical = Input.GetAxis("Vertical") * moveSpeed;

        dir = transform.forward * getVertical + transform.right * getHorizontal;

        characterController.Move(dir * Time.deltaTime);

        if (Input.GetButtonDown("Jump") && isGround)
        {
            velocity.y = jumpSpeed;
            isJumping = 0.2f;
        }
        if(isJumping > 0)
        {
            isJumping -= Time.deltaTime;
        }

        velocity.y -= gravity * Time.deltaTime;
        characterController.Move(velocity * Time.deltaTime);
    }
}

** 如果有关于玩家跳跃的更好解决办法，欢迎发表在评论区 **

实现第一人称视角控制

前面完成了前后左右移动和跳跃，这一步完成一个第一视角的转动功能
将Camera拖到Player的节点下，调整位置，然后为Camera添加脚本：

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

public class CameraController : MonoBehaviour
{
    public Transform Player;

    private float mouseX, mouseY;   //获取鼠标移动的值

    public float mouseSensitivity;  //鼠标灵敏度

    private float xRotation;

    private void Start()
    {
        mouseX = 0;
        mouseY = 0;
        mouseSensitivity = 800;
    }
    private void Update()
    {
        mouseX = Input.GetAxis("Mouse X") * mouseSensitivity * Time.deltaTime;
        mouseY = Input.GetAxis("Mouse Y") * mouseSensitivity * Time.deltaTime;

        xRotation -= mouseY;

        if (xRotation > 90)
        {
            xRotation = 90;
        }
        else if (xRotation < -90)
        {
            xRotation = -90;
        }

        Player.Rotate(Vector3.up * mouseX);
        transform.localRotation = Quaternion.Euler(xRotation, 0, 0);
    }
}