Character Controller組件

官方檔案：https://docs.unity.cn/cn/2019.4/Manual/class-CharacterController.html

1. 移動

直接上代碼：

public class PlayerController : MonoBehaviour
{
    //獲取組件
    public CharacterController characterController;

    //設定移動和跳躍速度
    public float moveSpeed;
    //定義按鍵輸入
    public float getHorizontal, getVertical;
    //定義移動向量
    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. 重力和跳躍

2.1 重力

• 定義重力、向下的速度（通過計算得出）
• 判斷物體是否在地面上，不在時開始計算向下的速度
• 通過physics.CheckSphere方法判斷物體是否在地面上
• 需要定義目標點transform、檢測半徑float、檢測圖層LayerMask來進行判斷
  代碼：

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

    //定義bool值判斷角色是否在地面上
    public bool isGround;

    //定義一個目標點，一個檢測半徑，一個檢測圖層
    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 跳躍

在這里遇到一個困難，如果直接用以下代碼的話：

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

理論上可行，但是通過實踐發現根本跳不起來，猜測和在上一步添加重力時的這一段代碼有關：

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

在起跳的時候程式又執行到這一部分，導致角色的velocity.y=0，從而使角色不能跳躍
暫時想到的解決辦法就是添加一個計時器，讓在起跳0.1秒內不再執行判斷isGround的代碼
通過修改后，PlayerController代碼如下：

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

public class PlayerController : MonoBehaviour
{
    //獲取組件
    public CharacterController characterController;

    //設定移動速度
    public float moveSpeed;
    //定義按鍵輸入
    public float getHorizontal, getVertical;
    //定義移動向量
    private Vector3 dir;

    //定義跳躍速度和跳躍狀態
    public float jumpSpeed;
    public float isJumping;
    //定義重力和下落加速度
    public float gravity = 9.8f;
    private Vector3 velocity = Vector3.zero;

    //定義bool值判斷角色是否在地面上
    public bool isGround;

    //定義一個目標點，一個檢測半徑，一個檢測圖層
    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;
            Debug.Log(isJumping);
        }

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

** 如果有關于玩家跳躍的更好解決辦法，歡迎發表在評論區 **

實作第一人稱視角控制

前面完成了前后左右移動和跳躍，這一步完成一個第一視角的轉動功能
將Camera拖到Player的節點下，調整位置，然后為Camera添加腳本：

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

public class CameraController : MonoBehaviour
{
    public Transform Player;

    private float mouseX, mouseY;   //獲取滑鼠移動的值

    public float mouseSensitivity;  //滑鼠靈敏度

    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);
    }
}