Pillbox Colliders and Player Controllers | Coding a 2D Game Engine in Java #49 @GamesWithGabe
Pillbox Colliders and Player Controllers | Coding a 2D Game Engine in Java #49  @GamesWithGabe
Uploaded June 2021 | Updated September 2026, 3 weeks ago
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In this episode I go over how to make a pillbox collider using circle colliders and box colliders (or fixtures) in Box2D. Then I talk about how to start building the player controller. I go over how to create a fake velocity and acceleration to give the player controller a fine level of control while still being able to use Box2D to handle all collisions.

Code: github.com/codingminecraft/MarioYoutube/tree/cc96a8d6168022c873961f3e1e0d43c0de73d237

0:00 Intro
1:09 Setting up Contact Listener
2:04 Rationale for Pillbox Collider
3:24 Coding Pillbox Collider
11:05 Modifying Physics Wrapper
12:29 Finishing Pillbox Collider Component
13:65 Updating Mario Prefab
20:10 Fixing State Machine Bugs
21:57 Adding Debug Drawing for Circle Colliders
22:28 Adding Prefabs to Basic Blocks
25:03 Fixing Physics Bug
25:49 Coding the Player Controller
36:02 Fixing State Machine Triggers
37:37 Adding Friction

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Website: ambrosiogabe.github.io
Github: github.com/ambrosiogabe

Here are some books I recommend if you want to learn about game engine development more thoroughly. I do not profit off any of these sales, these are just some books that have helped me out :)

My Recommended Game Engine Books:
Game Engine Architecture: gameenginebook.com
Game Physics Cookbook (Read this before the next physics book): amazon.com/Game-Physics-Cookbook-Gabor-Szauer/dp/1787123669
Game Physics (Ian Millington): amazon.com/Game-Physics-Engine-Development-Commercial-Grade/dp/0123819768
Game Programming Patterns (Free): gameprogrammingpatterns.com

My Recommended Beginning Game Programming Books:
JavaScript Game Design: apress.com/gp/book/9781430247166

My Recommended Java Books:
Data Structures/Algorithms: amazon.com/Data-Structures-Algorithms-Java-6th-ebook/dp/B00JDRQF8C
LWJGL (Free, but I haven't read this thoroughly): lwjglgamedev.gitbooks.io/3d-game-development-with-lwjgl/content
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Pillbox Colliders and Player Controllers | Coding a 2D Game Engine in Java #49

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