Unity 相机围绕目标旋转、缩放功能实现

//
using UnityEngine;

public class RotateAndZoomControl : MonoBehaviour
{
    [Header("获得旋转目标")]
    [SerializeField]
    private Transform target;//获取旋转目标

    [Header("绑定相机")]
    [SerializeField]
    private Camera camera;//绑定相机

    public float maxField;//控制相机FieldOfView的最大角度
    public float minField;//控制相机FieldOfView的最小角度


    private void Start()
    {
        //初始化相机面向物体
        camera.transform.forward = (target.position - camera1.transform.position).normalized;
    }
   
    private void Update()
    {
        
       
          CameraRotate();
          CameraZoom();
    }

    /// 
 相机围绕目标旋转 
    private void CameraRotate()
    {
        var mouse_x = Input.GetAxis("Mouse X");//获取鼠标X轴移动
        var mouse_y = -Input.GetAxis("Mouse Y");//获取鼠标Y轴移动
        if (Input.GetKey(KeyCode.Mouse0))
        {
            transform.RotateAround(target.transform.position, Vector3.up, mouse_x * 5);
            transform.RotateAround(target.transform.position, transform.right, mouse_y * 5);
        }
    }
    
    /// 

    /// 相机滚轮缩放（通过修改相机Field Of View的来进行缩放）
    /// 
    private void CameraZoom()
    {
        if (Input.GetAxis("Mouse ScrollWheel") > 0 && camera1.fieldOfView > minField)
        {
            camera.fieldOfView -= Input.GetAxis("Mouse ScrollWheel") * 5f;
        }
        if (Input.GetAxis("Mouse ScrollWheel") < 0 && camera1.fieldOfView < maxField)
        {
            camera.fieldOfView -= Input.GetAxis("Mouse ScrollWheel") * 5f;
        }
    }
}