[Help] Bounding Box Collision with Tileset (Without Rigidbodies)

Alright, so I’m making a lot of progress with my collisions in unity, but I can’t get tilemap collision detection working quite yet. I have a grid with a composite collider, and attached to that is a tilemap with a tilemap collider. The player uses a bounding box. I’m trying to make it so that if the player’s bounding box intersects a tile, it will return true, and if it doesn't it will return false. However, my code currently gets the bounds of the entire tilemap collider, and after digging through the documentation I'm not sure how to only detect bounding box intersections with actual solid tiles.
I should note that I'm only trying to get a true/false for if the player's bounding box is intersecting another bounding box, and possibly what objects I'm overlapping. I would also really like to avoid using Rigidbodies, because I can handle my own collisions and movement and even having kinematic rigidbodies on everything is something I would prefer to avoid.

Here's the collision code:

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class collideAt : MonoBehaviour
6. {
7.     //eventually going to replace this with a collection of all colliders in the scene or something for performance
8.     public GameObject self, target;
9.     Collider2D selfCollider, targetCollider;
10.  
11.     // Start is called before the first frame update
12.     void Start()
13.     {
14.         //if we have a collider (just to be safe lol)
15.         if (self != null)
16.         {
17.             selfCollider = self.GetComponent<Collider2D>();
18.         }
19.         else
20.         {
21.             Debug.Log("I don't have a collider");
22.         }
23.  
24.         //if the target has a collider
25.         if (self != null)
26.         {
27.             targetCollider = target.GetComponent<Collider2D>();
28.         }
29.         else
30.         {
31.             Debug.Log("Target has no collider");
32.         }
33.  
34.  
35.  
36.     }
37.  
38.     // Update is called once per frame
39.     void Update()
40.     {
41.         if (selfCollider.bounds.Intersects(targetCollider.bounds))
42.         {
43.             Debug.Log("Bounds intersecting");
44.         }
45.     }
46.  
47.     //private void OnTriggerEnter(Collider other)
48.     //{
49.     //    Debug.Log("Bounds intersecting");
50.     //}
51. }
52.  

I reposted this from the physics section because I realized that was not really the right place for this question. Sorry for any confusion that may cause, I'm new to the forum and didn't really know where to ask :|

 

I'm fine with using Rigidbodies so long as I'm only using them for things such as overlap detection, I just don't want them to have an effect on the gameplay.
The way that I'm writing the collision/movement system, actors handle movement 0.1 units at a time, checking each unit for overlap with anything else. Nothing can move less than 0.1 units, and tiles are 0.8x0.8 units. I'm trying to keep the gameplay and movement tight, so I don't want to use Unity's built-in realistic physics.
That said, if it's easier to use kinematic rigidbodies, I can try that. I just want to make sure it won't affect the actual movement at all, and I want to keep it simple enough that I can work with it. (I'm no expert, just a gamedev for fun.) I just wasn't sure if using kinematic rigidbodies would have any unforeseen effects on gameplay, and wasn't sure what I needed to use to get the info. I'll test around and see if I can get something working, thanks for the help!

 

Alright, so I tested a bit using the Physics.OverlapBox and I can't quite figure out how to use it.
Here's what I added to the code.

Code (CSharp):

1. void Update()
2.     {
3.         //if (selfCollider.bounds.Intersects(targetCollider.bounds))
4.         //{
5.         //    Debug.Log("Bounds intersecting");
6.         //}
7.         bool collisionTest = Physics2D.OverlapBox(self.transform.position, new Vector2(0.6f, 1.3f), 0);
8.         Debug.Log(self.transform.position + " — " + collisionTest);
9.     }

It doesn't seem to be doing anything, it's just outputting true. I think I set it up right...?

 

Ah, ok, I assumed physics was referring to the full 2d physics engine, using rigidbodies and stuff. My bad, I didn't really think that physics referred to more outside of that.
It turns out I had forgotten to remove the box collider from the player, hence the constant 'true' output. I had assumed you need to use it in conjunction with collider components. Am I supposed to use it without adding collider components in the inspector? Or do I need to make some additional code to tell it to ignore its own collider?
I'm also having the same problem I was having at the start–the player outputs true when in the bounds of the tilemap, and false when outside. It's still having trouble picking up individual tiles, and I'm still unsure as to why.

 

Update: The player was colliding with themself and a wierd hitbox that somehow got tossed onto a gui compnent. Everything's working fine now and I feel like an idiot .–.

 

Welcome to game development