Issue with Raycasts in Unity 2D

Questions & Answers
1

using UnityEngine;
using System.Collections;

public class EnemySight: MonoBehaviour
{
    public GameObject player;

    public float fovAngle;
    public bool playerInSight;

    void OnTriggerStay2D(Collider2D other)
    {
        if (other.gameObject == player)
        {
            Vector2 playerDir = other.transform.position - transform.position;
            float angle = Vector3.Angle(playerDir, transform.right);

            if (angle < fovAngle / 2)
            {
                RaycastHit2D hit = Physics2D.Raycast(transform.position, playerDir.normalized);

                if (hit.collider.gameObject == player)
                {
                    Debug.DrawRay(transform.position, playerDir.normalized, Color.green);
                    print("halp meh");
                }
            }
        }
    }
}

This is a script for an enemy view script for a 2d top down stealth game. The part that isn’t working is the last bit involving the raycasts. Everything works up to the hit.collider.gameObject == player. Nothing prints and the debug ray is not drawn. If I change it to hit.collider != null it “works”, but the raycasts hit the enemy itself. There are no actual errors, and the variables are all defined in-editor. Any help/comments are appreciated. Relatively new to Unity so it’s probably a dumb mistake.

2

Instead of comparing the actual gameobject, set the layer for the player and compare that instead.

If your player collider is in a nested gameobject, the comparison will be false.

if(other.gameObject.layer == LayerMask.NameToLayer("Player"))
{
//...
}

Also try debugging the ray before any comparison is made:

Instead of this:

if (angle < fovAngle / 2)
 {
            RaycastHit2D hit = Physics2D.Raycast(transform.position, playerDir.normalized);
     
            if (hit.collider.gameObject == player)
             {
                Debug.DrawRay(transform.position, playerDir.normalized, Color.green);
                print("halp meh");
            }
 }

It should look like this:

if (angle < fovAngle / 2)
                 {
                     RaycastHit2D hit = Physics2D.Raycast(transform.position, playerDir.normalized);
     Debug.DrawRay(transform.position, playerDir.normalized, Color.green);
                     if (hit.collider.gameObject == player)
                     {
                         
                         print("halp meh");
                     }
                 }
3

The reason it wasn’t working is the ray was hitting the enemy (where the script was attached to). All I had to do was add a layer mask that ignored the enemy.