How to Raycast Against a Circle | Coding a 2D Physics Engine in Java #8

Channel:

GamesWithGabe

Subscribers:

59,400

Published on July 14, 2020 4:15:00 PM ● Video Link: https://www.youtube.com/watch?v=23kTf-36Fcw

Game:

Particulars (2014)

Duration: 21:05

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In this tutorial, I explain how to manually create a ray and cast it against a circle. 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 circle. I also describe the cases when the ray would miss the circle, and how to detect those cases. Lastly, I describe how to detect where the ray hits the circle if the origin of the ray is inside the circle.

Source Code: https://github.com/codingminecraft/MarioYoutube/tree/e201829ba2c38c776511287c9d8b74b21e0842f8

0:00 Intro
1:18 Raycasting Circle 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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