Collisions Without a Physics Library! (Coding Challenge 184)

What happens when two circles collide in a p5.js canvas? In this video, I examine the math and implement idealized elastic collisions in a JavaScript physics simulation. This video supplements the Nature of Code book series in Chapter 6 which uses 3rd party physics libraries to handle collisions rather than a direct implementation. Code: https://thecodingtrain.com/challenges...

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p5.js Web Editor Sketches:
🕹️ Elastic Collisions: https://editor.p5js.org/codingtrain/s...
🕹️ Elastic Collisions - Quadtree: https://editor.p5js.org/codingtrain/s...

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References:
📕 The Nature of Code: https://natureofcode.com/
🛒 Pre-order The Nature of Code: https://nostarch.com/nature-code
🔗 Elastic Collision: https://en.wikipedia.org/wiki/Elastic...
📃 2-Dimensional Elastic Collisions without Trigonometry: https://www.vobarian.com/collisions/2...
📃 Elastic Collisions Formula Derivation: https://dipamsen.github.io/notebook/c...

Related Coding Challenges:
🚂 Coding Challenge #67: Pong!
🚂 Coding Challenge #98.1: Quadtree - Pa...
🚂 Coding Challenge #139: Calculating Di...
🚂 Coding Challenge 176: Buffon's Needle

Timestamps:
0:00 Introduction
0:20 The Nature of Code book
1:22 Review background material
4:15 Collision Resolution
5:42 Start Coding
8:48 Add collide() function
10:17 Momentum and kinetic energy
14:15 Line of impact
16:44 Add the formulas
21:25 Simplify the code
22:57 Check for overlap
24:31 Check the particle's kinetic enery
25:48 Fix error
27:30 Add more particles
30:11 Optimizations
30:50 Outro

Editing by Mathieu Blanchette
Animations by Jason Heglund
Music from Epidemic Sound

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🔗 p5.js: https://p5js.org
🔗 p5.js Web Editor: https://editor.p5js.org/
🔗 Processing: https://processing.org

📄 Code of Conduct: https://github.com/CodingTrain/Code-o...

This description was auto-generated. If you see a problem, please open an issue: https://github.com/CodingTrain/thecod...

#collisions #physicssimulation #p5js #javascript
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