Ball Pit

memalign 157 points 41 comments March 25, 2026
codepen.io · View on Hacker News

Discussion Highlights (17 comments)

newobj

path tracer?

simlevesque

Beware: this might totally freeze your computer like it did for me.

p1necone

This runs pretty smoothly on my middling laptop CPU while looking like a typical raytracing demo. I assume there's some smoke and mirrors involved?

jessepasley

Is this marketing for the Shape Store? It's cool but I still don't know when my area is getting a Shape Store.

Rendello

Beautiful, this must have been an excellent learning experience to make. I've done some very basic rendering code in C from a rendering internals course, and at the same time I'm learning about perspective from the drawing/art side. I wonder how much learning one would help the other, in a practical way.

verytrivial

For some context, I think this is by mr.doob of three.js fame.

hermitcrab

I'm a C++ programmer and only passingly familiar with web/JS stuff. What libraries/technologies is this using, apart from Javascript and three.js?

CodeWriter23

I was able to get all the balls stuck on the 'ceiling'. Bug or feature?

RankingMember

> The babies look unhappy > Add more balls Fun simulation. The novelty of stuff like this still hasn't worn off for me in this era where we've got ray tracing in-browser.

TacticalCoder

I have fond memories of visiting a university in the early 90s on a demo day and there was a (physical) sphere in a Cornell box: https://en.wikipedia.org/wiki/Cornell_box And next to it was a super beefy computer doing a 3D rendering of a similar scene. 35 years+ later I've got "many spheres in a Cornell box" rendering in my browser, love it : )

rbosinger

I opened that on a Pixel 9a and was impressed on how well it worked. There's something neat about this.

artursapek

that's amazing. it runs so smoothly on my M4 Pro

petermcneeley

Nice! I raise https://www.shadertoy.com/view/3tcGD2

chrysoprace

What a time to be alive. It runs surprisingly smooth on Firefox/Linux and doesn't appear to put much strain on my 9070 XT.

appstorelottery

Runs great on MacBook Air M1! Super!

slopinthebag

It's cool but shockingly slow for an SSGI implementation, especially without any denoising.

fuzzfactor

This does work good with Linux and Firefox on older PCs too.

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