Unity でマウスの位置に徐々に移動するスクリプト

TouchMove

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

public class TouchMove : MonoBehaviour {
	
	[SerializeField] private GameObject cube;
	[SerializeField]private float speed = 2.0f;
	// Update is called once per frame
	void Update () 
	{
		if(Input.GetMouseButton(0))
		{
			Debug.Log("mouse douwn");
			Vector3 pos = Input.mousePosition;
    		pos.z = 10.0f;
			Vector3 worldPos = Camera.main.ScreenToWorldPoint(pos);
			cube.transform.position = Vector3.MoveTowards(cube.transform.position, worldPos, speed *Time.deltaTime); 
		}
	}
}