相机围绕物体旋转 拉近效果

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

public class CameraControl : MonoBehaviour
{
    public Transform target;//获取旋转目标
    public float speed=1;//获取旋转目标
    // Use this for initialization
    void Start()
    {

    }

    // Update is called once per frame
    void Update()
    {
        Camerarotate();
        camerazoom();
    }

    private void Camerarotate() //摄像机围绕目标旋转操作
    {
        transform.RotateAround(target.position, Vector3.up, speed * Time.deltaTime); //摄像机围绕目标旋转
        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.Mouse1))
        //{
        //    transform.Translate(Vector3.left * (mouse_x * 15f) * Time.deltaTime);
        //    transform.Translate(Vector3.up * (mouse_y * 15f) * Time.deltaTime);
        //}
        if (Input.GetKey(KeyCode.Mouse1))
        {
            transform.RotateAround(target.transform.position, Vector3.up, mouse_x * 5);
            transform.RotateAround(target.transform.position, transform.right, mouse_y * 5);
        }
    }
    private void camerazoom() //摄像机滚轮缩放
    {
        if (Input.GetAxis("Mouse ScrollWheel") > 0)
            transform.Translate(Vector3.forward * 0.5f);
        if (Input.GetAxis("Mouse ScrollWheel") < 0)
            transform.Translate(Vector3.forward * -0.5f);
    }
}