本章代碼基于前兩章。
1. 我們新建CameraController腳本，將其掛載到Camera上
2. 在角色Player下新建一個(gè)空物體，命名為cameraTargetPoint，并將該物體掛載至CameraController腳本中【注意代碼中的這行：public Transform cameraTargetPoint;】，將該空物體放在人物頭部附近位置
3.將PlayerController腳本綁定至CameraController中【public PlayerController playerController;】
4.本章代碼的實(shí)現(xiàn)原理是讓攝像機(jī)對(duì)準(zhǔn)空物件，并保持一定距離
5. 具體代碼如下

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

public class CameraController : MonoBehaviour
{
    private static float lower_upper_bound = 60f;
    public Transform cameraTargetPoint;
    public float cameraDistance = 5.0f;
    public Vector2 verticalRange = new Vector2(-lower_upper_bound, lower_upper_bound);
    public float cameraSensitivity = 120f;

    private Transform verticalObj;
    private Transform horizontalObj;
    private float horizontalValue;
    private float verticalValue;

    public PlayerController playerController;
    // Start is called before the first frame update
    void Start()
    {
        horizontalObj = new GameObject("Camera Horizontal").transform;
        horizontalObj.SetParent(cameraTargetPoint);
        horizontalObj.localPosition = Vector3.zero;
        horizontalObj.localRotation = Quaternion.identity;
        verticalObj = new GameObject("Camera Vertical").transform;
        verticalObj.SetParent(horizontalObj);
        verticalObj.localPosition = Vector3.zero;
        verticalObj.localRotation = Quaternion.identity;
        transform.SetParent(verticalObj);
        transform.localPosition = new Vector3(0,0,-cameraDistance);
        transform.localRotation = Quaternion.identity; 
    }

    // Update is called once per frame
    void Update()
    {
        cameraMoving();
        DoNotTouchTheGround();
    }

    private void cameraMoving()
    {
        horizontalValue += Input.GetAxis("Mouse X") * Time.deltaTime * cameraSensitivity;
        horizontalObj.localRotation = Quaternion.Euler(new Vector3(0, horizontalValue, 0));
        verticalValue += Input.GetAxis("Mouse Y") * Time.deltaTime * cameraSensitivity;
        verticalValue = Mathf.Clamp(verticalValue, verticalRange.x, verticalRange.y);
        verticalObj.localRotation = Quaternion.Euler(new Vector3(-verticalValue, 0, 0));
    }

    private void DoNotTouchTheGround()    // 攝像機(jī)與角色點(diǎn)中間有物體時(shí)，讓攝像機(jī)處于物體前，避免遮擋
    {
        Vector3 distanceVec = transform.position - cameraTargetPoint.position;
        float distance = distanceVec.magnitude;
        RaycastHit hit;
        if(Physics.Raycast(cameraTargetPoint.position,distanceVec, out hit,distance))
        {
            if(hit.transform.tag != "Player")
            {
                transform.position = hit.point;
            }
            else
            {
                transform.localPosition = Vector3.Lerp(transform.localPosition, new Vector3(0, 0, -distance), 0.3f);
            }
        }
        else
        {
            transform.localPosition = Vector3.Lerp(transform.localPosition, new Vector3(0, 0, -distance), 0.3f);
        }

    }
}

Tips:以上代碼中，DoNotTouchTheGround()方法不是必須的，該方法是用于限制當(dāng)攝像機(jī)與角色之間有障礙物時(shí)，把攝像機(jī)放在障礙物前方以避免視覺阻礙，可以看情況添加。

至此，我們可以實(shí)現(xiàn)攝像機(jī)跟隨角色移動(dòng)，并且鼠標(biāo)能操控?cái)z像機(jī)繞著角色轉(zhuǎn)動(dòng)，但仍有一個(gè)問題：當(dāng)攝像機(jī)位于人物前方時(shí)，人物前進(jìn)方向仍是我們的后方，這是由于參考坐標(biāo)系的緣故，具體修復(fù)如下：

1. 在PlayerController腳本中，添加

public Transform cameraTargetPoint;

在Move方法中添加【moveingVec = cameraTargetPoint.TransformDirection(moveingVec);】：

private void Move()
    {
        float horizontalInput = Input.GetAxis("Horizontal");
        float verticalInput = Input.GetAxis("Vertical");

        Vector3 moveingVec = new Vector3(horizontalInput, 0f, verticalInput) * Time.deltaTime * speed;
        moveingVec = cameraTargetPoint.TransformDirection(moveingVec);
        transform.Translate(moveingVec);
        
    }

2. 在CameraController腳本中的cameraMoving()方法中添加下句：

playerController.cameraTargetPoint = horizontalObj;

于是即可實(shí)現(xiàn)攝像頭跟隨鼠標(biāo)，并圍繞角色運(yùn)動(dòng)，并且角色運(yùn)動(dòng)方向【僅僅是方向，如果要人物轉(zhuǎn)向，則還需其他修改，本系列其他章節(jié)會(huì)有涉及】可以自適應(yīng)為當(dāng)前攝像頭的前方文章來(lái)源地址http://www.zghlxwxcb.cn/news/detail-835167.html

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