Collision DetectionHow To Detect Collisions in C# - Unity

Author Waldo
Published November 1, 2018

In this tutorial we discuss adding colliders on our objects so that we can detect collision within our script.

Video Walkthrough

  • 0:55 - Choosing the right collider for your environment
  • 1:05 - How a collider works
  • 1:30 - 2D and 3D colliders to use
  • 2:05 - Adding a Circle Collider 2D
  • 3:35 - Adding a Box Collider 2D
  • 4:19 - How to use isTrigger
  • 4:45 - Detecting Collision in C#
  • 6:10 - Using Instantiate to load an explosion
  • 7:00 - Destroy on Collision

Source Code for ship.cs

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

public class ship : MonoBehaviour {
    public GameObject explosion;

    private void OnTriggerEnter2D(Collider2D other){
        Debug.Log("hit detected");
        GameObject e = Instantiate(explosion) as GameObject;
        e.transform.position = transform.position;



1. Mobile Joystick Tutorial
2. Keeping Objects in Bounds
3. Spawning Obstacles Tutorial

Click here to download the explosion sprite sheet used in this video.

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