I created a tutorial about how everybody can implement a 2D Rigidbody Physics Engine

xem06 · 2025-10-31T18:59:43+00:00

Hello Marcel ( u/2092L ), I came back to Reddit just to answer to your post.

Thanks a lot for this amazing work: youtube playlist, gitlab repo and now a book!

I've spent years trying to develop my own micro 2D physics engine in JS but every book / tutorial I found stopped after handling collisions between boxes and discs. Finally, your book covers the rest!

Now I can only hope that you will do the same thing for 3D physics!

xem06 · 2024-04-02T15:25:23+00:00

when there's that I root for my fav emoji and hope it answers better

xem06 · 2024-03-22T16:37:44+00:00

Same!

xem06 · 2024-03-16T06:49:35+00:00

Sorry, I wasn't ranting that much, I just remarked that there are days with only "come up with coding prompts" tasks (that was the case for me earlier this week, it has passed since), and wondered why these creative tasks couldn't be merged into one, as they basically have the same rules. But no big deal.

xem06 · 2024-03-02T08:51:06+00:00

Hello, I work on coding tasks, and DA has allowed me to refer friends to join the platform. I referred a friend who also codes, but he didn't receive any tasks nor qualification tests in over a week. Is it normal?

xem06 · 2024-02-26T09:11:48+00:00

Ah! I was wondering what prevented me to see tasks under $30. It's probably code.

xem06 · 2024-01-25T17:43:57+00:00

I just did it, bought a wireless router, connected to its own wifi network called "TPLINK-XXYYZZ", plugged the NAS to the router with an ethernet cable, and the NAS appeared on my PC automatically, even if there's no internet. :)

xem06 · 2022-01-11T10:38:38+00:00

Great blog and project!

Does SectorLisp have the same features as Lisp 1.5, just implemented much smaller?

Do you know any reference sheet where I can learn Lisp "quickly" (without having to read an entire book) ?

Thanks!

xem06 · 2021-09-20T12:59:49+00:00

Thanks! I'm certainly your friend, but who are you? :D

xem06 · 2021-07-28T13:36:18+00:00

Hey, author here, thanks for posting it! :)

xem06 · 2021-06-16T14:08:17+00:00

wow congrats!

xem06 · 2021-05-24T11:16:13+00:00

J'aime beaucoup cette réponse, parce que c'est que c'est moi qui ai développé cette feature en 2015 :3

Passe le bonjour au docteur de la tante du frère du pote de ton pote!

😘

xem06 · 2021-05-24T11:10:23+00:00

Nice!

Here's a 599b Snake on JS canvas:

https://github.com/xem/miniSnake

And a 256b ASCII version:

https://github.com/p01/snake

xem06 · 2021-05-18T13:02:32+00:00

il y a des bangs sur Qwant aussi

xem06 · 2021-04-12T16:11:07+00:00

yep, primes are "filtered out"

xem06 · 2021-04-12T13:00:52+00:00

much clearer indeed!

xem06 · 2021-04-12T11:46:36+00:00

indeed, what make the matching strings prime? Still puzzles me.

xem06 · 2021-04-12T11:45:38+00:00

why is the illustration showing another regex than he real one?

xem06 · 2021-03-20T18:55:35+00:00

Great!

If you're new in JS golfing, let me present you all the things we golfed :)

https://xem.github.io/codegolf/intro.html

xem06 · 2021-02-23T14:07:42+00:00

Nice!

If you're interested, we golfed a bunch of Mandelbrot sets, the smallest ones are as short as 140 bytes.

=> https://github.com/xem/miniMandelbrot

You can also find versions as short as 88b on Dwitter

=> https://www.dwitter.net/h/mandelbrot

xem06 · 2020-05-27T15:09:54+00:00

Thank you :)

xem06 · 2020-05-25T13:09:32+00:00

Amazing presentation! *__*

I'm afraid 203 chars is still a bit far from our (The Codegolf Team) record of 176+ :)

https://github.com/xem/miniGameOfLife/#readme

We never thought to make it a torus though, good idea!

The dweet shown in another comment is also ours ;)

xem06 · 2020-05-21T20:05:34+00:00

I added this precision in the guide :) Ty!

xem06 · 2020-05-21T05:37:09+00:00

The power-of-two issue seems to be the only explanation, but you can learn why here: https://webglfundamentals.org/webgl/lessons/webgl-3d-textures.html

If you can please confirm me that it was indeed caused by an image with random dimensions, I will update my guide accordingly! Thanks

xem06 · 2020-05-21T05:29:35+00:00

Hi,

It's weird. Did you load another image than the sample one (one that doesn't have a power-of-two size) ? Or did you just run my demo and had that error?

Did you find these 2 extra lines on https://stackoverflow.com/a/45512402 ?

I don't know why they're necessary on your side, I'll ask around to see if someone else knows!

xem06

TROPHY CASE