5 ms·

Show HN: I built an interactive 3D three-body problem simulator in the browser

60 points by amrutha_ 7mo ago

kurthong 7mo ago
https://solgrbit.d9ng.co.kr/ https://solgrbit.d9ng.co.kr/ Had a similar idea and built a prototype for it.
kurthong 7mo ago
Had a similar idea and built a prototype for it. :)
hermitcrab 7mo ago
Random3D seems to always have all the stars heading off to infinity.
- Nevermark 7mo ago
  Occasionally two will tight spiral off together. (Experimentally 5/250, including 1 cool wide, almost flat spiral.)
ubezon 7mo ago
Very cool! nice to be able to export json too
hazrmard 7mo ago
Very cool! Interesting how the choice of solver affects the solution. Euler doesn't handle misbehaved equations very well. You can see this in the Helix setup where the bodies just fly off.
westurner 7mo ago
Notes re: Multi-body problems on "Show HN: Browser-based interactive 3D Three-Body problem simulator" (2025) https://news.ycombinator.com/item?id=45981336 https://news.ycombinator.com/item?id=45981336 which has Velocity Verlet integration method, 4th-order Runge-Kutta (RK4), and Kepler solvers
kordlessagain 7mo ago
No Weber very sad.
- koolala 7mo ago
  needs a WebXR bookmarklet
curseofcasandra 7mo ago
The tri-Solarians could have just used this!
- qingcharles 7mo ago
  They did :) That's why they said fuck that and moved to Earth.
mileszhang 7mo ago
[dead]
neondude 7mo ago
Feedback : The ui covers more than half my screen on mobile browser
- tecoholic 7mo ago
  +1 Please add a hide button for the UI. I love the animation. Unfortunately can’t see it fully
  - djmips 7mo ago
    I set the zoom to 50% in the browser and was able to see well.
koolala 7mo ago
When I hit Random 3d to see a normal three-body they yeet out of existence far far away.
modeless 7mo ago
How many of these are there? https://trisolarchaos.com/ https://trisolarchaos.com/
vivzkestrel 7mo ago
- i have seen a tonne of these - would be nice if someone at this point actually made a tutorial on how to go about making one from scratch with threejs
- throwaway290 7mo ago
  these days they don't know because they didn't actually write this:)
efilife 7mo ago
OP's account posts LLM generated comments almost exclusively, this is likely not an exception
ranger_danger 7mo ago
But I thought Terrence Howard solved it already /s

60 points by amrutha_ 7mo ago

kurthong 7mo ago

https://solgrbit.d9ng.co.kr/ https://solgrbit.d9ng.co.kr/ Had a similar idea and built a prototype for it.

kurthong 7mo ago

Had a similar idea and built a prototype for it. :)

hermitcrab 7mo ago

Random3D seems to always have all the stars heading off to infinity.

Nevermark 7mo ago
Occasionally two will tight spiral off together. (Experimentally 5/250, including 1 cool wide, almost flat spiral.)

ubezon 7mo ago

Very cool! nice to be able to export json too

hazrmard 7mo ago

Very cool! Interesting how the choice of solver affects the solution. Euler doesn't handle misbehaved equations very well. You can see this in the Helix setup where the bodies just fly off.

westurner 7mo ago

Notes re: Multi-body problems on "Show HN: Browser-based interactive 3D Three-Body problem simulator" (2025) https://news.ycombinator.com/item?id=45981336 https://news.ycombinator.com/item?id=45981336 which has Velocity Verlet integration method, 4th-order Runge-Kutta (RK4), and Kepler solvers

kordlessagain 7mo ago

No Weber very sad.

koolala 7mo ago
needs a WebXR bookmarklet

curseofcasandra 7mo ago

The tri-Solarians could have just used this!

qingcharles 7mo ago
They did :) That's why they said fuck that and moved to Earth.

mileszhang 7mo ago

[dead]

neondude 7mo ago

Feedback : The ui covers more than half my screen on mobile browser

tecoholic 7mo ago
+1 Please add a hide button for the UI. I love the animation. Unfortunately can’t see it fully
- djmips 7mo ago
  I set the zoom to 50% in the browser and was able to see well.

koolala 7mo ago

When I hit Random 3d to see a normal three-body they yeet out of existence far far away.

modeless 7mo ago

How many of these are there? https://trisolarchaos.com/ https://trisolarchaos.com/

vivzkestrel 7mo ago

- i have seen a tonne of these - would be nice if someone at this point actually made a tutorial on how to go about making one from scratch with threejs

throwaway290 7mo ago
these days they don't know because they didn't actually write this:)

efilife 7mo ago

OP's account posts LLM generated comments almost exclusively, this is likely not an exception

ranger_danger 7mo ago

But I thought Terrence Howard solved it already /s