Unityでクリックしたところにブロックを置く

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

public class BlockCreate : MonoBehaviour
{
    private Vector3 clickPosition;
    public GameObject cube;

    // Start is called before the first frame update
    void Start()
    {
        cube.tag = "Ground";
    }

    // Update is called once per frame
    void Update()
    {
        Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
        RaycastHit hit = new RaycastHit();

        if (Input.GetMouseButtonDown(0))
        {

            Debug.DrawRay(ray.origin, ray.direction * 1000, Color.red, 3, false);

            if (Physics.Raycast(ray, out hit))
            {               
                Instantiate(cube, hit.point, Quaternion.identity);
            }
        }
    }
}