OnTriggerEnter not working when placed inside Update()

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I'm making a scanner that scans the "world" (like a 10 x 10 space), and I'm trying to sense a GameObject called pointer.

They both have colliders, they both have triggers, and the scanner has a rigidbody. I have tried the OnTriggerEnter method outside of the update, and it worked, but as soon as I put it inside of Update, it breaks.

I don't have to worry about being specific on what the scanner is detecting, because those two are the only ones with a collider.

using System.Collections; using System.Collections.Generic; using UnityEngine; public class Scan : MonoBehaviour { public int worldHeight; public int worldWidth; public bool sensed; public bool spaceBar = false; void Update() { if (Input.GetKeyDown("space") && spaceBar == false) { spaceBar = true; sensed = false; //brings scanner to top left corner of world transform.position = new Vector3(worldWidth / 2 * -0.64f + 0.32f, worldHeight / 2 * 0.64f + 0.32f, -1); for (int sizey = 0; sizey < worldHeight; sizey++) { if (sensed == false) { //shifts scanner down transform.position = new Vector3(worldWidth / 2 * -0.64f - 0.32f, transform.position.y, -1); transform.position = transform.position - new Vector3(0, 0.64f); for (int sizex = 0; sizex < worldWidth; sizex++) { if (sensed == false) { //shifts scanner right transform.position = transform.position + new Vector3(0.64f, 0); void OnCollisionEnter2D(Collision2D grid) { //not working ;-; sensed = true; } } } } } } else { spaceBar = false; } } }

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