[游戏开发]【Unity】相机跟随

《Unity3D网络游戏实战》学习
Unity版本：2019.4.23f1c1
-此篇涉及代码

此篇中场景创建与资源商店模型下载可参考：
unity入门之天空 山脉 草木 湖泊
unity入门之模型载入
也可以简单用立方体等替代

1.建立跟随目标
2.新建c#脚本

3.编写代码，此处命名为move

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

public class move : MonoBehaviour
{
    // Start is called before the first frame update
    void Start()
    {

    }

    // Update is called once per frame
    void Update()
    {
        float speed = 1;
        if (Input.GetKey(KeyCode.UpArrow))
        {
            transform.eulerAngles = new Vector3(0, 0, 0);
            transform.position += transform.forward * speed;
        }
        //下
        else if (Input.GetKey(KeyCode.DownArrow))
        {
            transform.eulerAngles = new Vector3(0, 180, 0);
            transform.position += transform.forward * speed;
        }
        //左
        else if (Input.GetKey(KeyCode.LeftArrow))
        {
            transform.eulerAngles = new Vector3(0, 270, 0);
            transform.position += transform.forward * speed;
        }
        else if (Input.GetKey(KeyCode.RightArrow))
        {
            transform.eulerAngles = new Vector3(0, 90, 0);
            transform.position += transform.forward * speed;
        }
    }
}

4.将脚本拖入跟随目标的属性面板中

其中注意修改的地方
（1）跟随目标
这里是跟随目标，名为SkeletonOutlaw_Armor - LOD0
可右键重命名）
代码中注意修改

3.再建立一个摄像机跟随的c#脚本，此处命名为CameraFlower
（里面的一些数据我自己修改了点

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

public class CameraFlower : MonoBehaviour
{
    // Start is called before the first frame update
    //距离
    public float distance = 4;
    //横向角度
    public float rot = 5;
    //纵向角度
    private float roll = 25f * Mathf.PI * 2/360;
    //目标物体
    private GameObject target;
    void Start()
    {
        //找到跟随目标 目标名tank
        target = GameObject.Find("SkeletonOutlaw_Armor - LOD0");
        SetTarget(target);
    }

    // Update is called once per frame
    void LateUpdate()
    {
        if (target == null)
            return;
        if (Camera.main == null)
            return;
        //目标的坐标
        Vector3 targetPos = target.transform.position;

        //计算相机的位置并保存到vector3类型的cameraPos中
        Vector3 cameraPos;
        float d = distance * Mathf.Cos(roll);
        float height = distance * Mathf.Sin(roll);
        cameraPos.x = targetPos.x + d * Mathf.Cos(rot);
        cameraPos.z = targetPos.z + d * Mathf.Sin(rot);
        cameraPos.y = targetPos.y + height;
        Camera.main.transform.position = cameraPos;
        //对准目标
        Camera.main.transform.LookAt(target.transform);
    }
    public void SetTarget(GameObject target)
    {
        if (target.transform.Find("cameraPoint") != null)
            this.target = target.transform.Find("cameraPoint").gameObject;
        else
            this.target = target;
    }
}

（2）脚本名称
这里是CameraFlower
将脚本拖入camera组件中

运行即可发现，物体移动时，摄像机跟随

目前有个问题，相机必须是初始的main camera，无法自己重新从游戏对象中创建摄像机跟随
（未完