raycast

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

public class EnemyView : MonoBehaviour
{

    private void Update()
    {
        RaycastHit2D hit = Physics2D.Raycast(transform.position, transform.up);

        Debug.DrawRay(transform.position, transform.up * 10, Color.red);

        if (hit)
        {
            Debug.Log("Spotted!");
        }
    }
}