unity

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

public class CameraScript : MonoBehaviour
{
    public GameObject ply;
    private Vector3 dist;

    // Start is called before the first frame update
    void Start()
    {
        dist = transform.position - ply.transform.position;
    }

    // Update is called once per frame
    void Update()
    {
        transform.position = ply.transform.TransformPoint(dist);
        transform.LookAt(ply.transform);
    }
}