How to Raycast Against a Box (OBB) | Coding a 2D Physics Engine in Java #9

Channel:

GamesWithGabe

Subscribers:

59,400

Published on July 17, 2020 4:15:00 PM ● Video Link: https://www.youtube.com/watch?v=QxpgtVrjYrg

Game:

Particulars (2014)

Duration: 24:31

3,928 views

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In this tutorial, I explain how to manually create a ray and cast it against a rotated box. I show how you can use some vector projections and a bit of trigonometry to find the exact point at which a ray hits a rotated box. I also describe the cases when the ray would miss the box, and how to detect those cases. Lastly, I describe how to detect where the ray hits the box if the origin of the ray is inside the box. This is just one method of solving this particular problem, there may be better solutions, but this is a good introduction to how to solve a raycast.

Source Code: https://github.com/codingminecraft/MarioYoutube/tree/537d8b589d13ecc4a2a830ff45c607a2feb4b381

0:00 Intro
0:39 Raycasting Box Math
10:55 Coding the Raycast

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Website: https://ambrosiogabe.github.io/
Github: https://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: https://www.gameenginebook.com/
Game Physics Cookbook (Read this before the next physics book): https://www.amazon.com/Game-Physics-Cookbook-Gabor-Szauer/dp/1787123669
Game Physics (Ian Millington): https://www.amazon.com/Game-Physics-Engine-Development-Commercial-Grade/dp/0123819768
Game Programming Patterns (Free): https://gameprogrammingpatterns.com/

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

My Recommended Java Books:
Data Structures/Algorithms: https://www.amazon.com/Data-Structures-Algorithms-Java-6th-ebook/dp/B00JDRQF8C
LWJGL (Free, but I haven't read this thoroughly): https://lwjglgamedev.gitbooks.io/3d-game-development-with-lwjgl/content/

Outro Music: https://www.bensound.com/royalty-free-music

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