Question Collision2D not working as expected for movement

Apologies if this is a dumb question, but this makes no sense to me.

I'm trying to create a basic unit controller for a 2D RTS style game. Currently, I am trying to add the simple movement mechanics of automatically moving to the right unless the unit makes contact with another object tagged "enemy" or "end".

You can see in the code below, that the script is extremely simple, and the the scene only consists of the unit with attached movement script, RigidBody2D, and BoxCollider2D; the enemy with attached RigidBody2D and BoxCollider2D; and the end which only has a BoxCollider2D(isTrigger).

The unit will move to the right and then correctly stop for the end gameobject, but the enemy gameobject does not stop the unit, and is instead pushed back by the same velocity indefinitely.

Running the Debugs, I've noticed that the collision with the enemy is being detected, but for some reason the MovementBool change is not being acknowledged by the Movement() function, causing the unit to continue to move to the right.

This is very confusing to me as the exact same output from detecting the end rather than the enemy collision will successfully change the bool and stop movement.

Code:

Code (CSharp):

1. using System;
2. using System.Collections;
3. using System.Collections.Generic;
4. using Unity.VisualScripting;
5. using UnityEngine;
6. using TMPro;
7.  
8. public class BasicCombatController : MonoBehaviour
9. {
10.     public Rigidbody2D unitrb;
11.     bool MovementBool = true;
12.  
13.     private void Start()
14.     {
15.         Debug.Log("Void Start");
16.         unitrb = GetComponent<Rigidbody2D>();
17.     }
18.  
19.     private void FixedUpdate()
20.     {
21.         Movement();
22.     }
23.  
24.     // Move right at 2 velocity if bool is true
25.     private void Movement()
26.     {
27.         if (MovementBool == true)
28.         {
29.             Debug.Log("Movement");
30.             unitrb.velocity = new Vector3(2, 0, 0);
31.         }
32.     }
33.  
34.     // Stop movement when end or enemy collider enters
35.     private void OnCollisionEnter2D(Collision2D other)
36.     {
37.        
38.         if (other.gameObject.CompareTag("end"))
39.         {
40.             Debug.Log("Stop for End");
41.             MovementBool = false;
42.         }
43.         if (other.gameObject.CompareTag("enemy"))
44.         {
45.             Debug.Log("Stop for Enemy (enter)");
46.             MovementBool = false;
47.         }
48.     }
49. }
50.  

 

You're setting booleans to false... that's nice.

Where are you setting velocity to zero?

 

Good question. I wasn't!

It works now, and I mirrored it onto another script for the enemy. Now they walk towards each other, and stop on contact as desired.

Thank you!