Physics porn
I made this!
Hot DP* action with balls swinging everywhere. A mesmerising physics simulator that’s as pointless as it is beautiful. Procrastinate like there’s no tomorrow (because there isn’t).
*Double Pendulum
Interactive Double Pendulum Simulator | Chaos Theory Physics
(, Sat 6 Sep 2025, 9:22, Reply)
Well, my son has been playing with this for literally half an hour at this point so I think you've got a fan
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evil_andy Stick stick stick stick sticky sticky stick stick, Sat 6 Sep 2025, 12:40,
Reply)
Cool. Ivé just realised it isn't great when viewed in landscape. I'll work on some fixes
(, Sat 6 Sep 2025, 13:18, Reply)
I remember trying to code this a couple of weeks after I learned programming
Was a lot harder than I expected. I gave up of course, beer time!
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simbosan is too tired, Sat 6 Sep 2025, 13:43,
Reply)
That's highly mesmerising
The damping seems to control the speed (or gravity) rather than take energy out of the system - is that intentional?
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tarka_dall Like normal dall, only a bit more spicy, Sat 6 Sep 2025, 17:58,
Reply)
Intentional currently. I have struggled with this aspect, I had another build that would crush momentum pretty much on the first or second swing with the damper slider at low values.
(, Sat 6 Sep 2025, 19:51, Reply)
Err.. may have fixed it. Try it again. You may have to clear cache or use different browser or private mode or something to see the change?
(, Sat 6 Sep 2025, 21:18, Reply)
That's sorted it.
Cheers!
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tarka_dall Like normal dall, only a bit more spicy, Sat 6 Sep 2025, 21:36,
Reply)
Ooh - you can add energy to the system!
Just increase one of the masses suddenly at the crucial moment and you can get them flailing about way faster than they would otherwise!
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tarka_dall Like normal dall, only a bit more spicy, Sun 7 Sep 2025, 22:00,
Reply)
GIMP :o
Made with your thingy as the basis though.
BTW what happens when you give either pendulum negative weight?
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brb Monkhouse Stampede, Sat 6 Sep 2025, 21:16,
Reply)
I have more suggestions/requests:
Trail length to 0
Trail length to infinity
Time speed control
LFOs for the pendulum lengths
Manual zoom (and, if it's not too much trouble, camera angle)
Numeric angle labels in pause mode
Hide pendulums on/off (especially in png output)
Save initial conditions/settings
Customisable colours
Output as .wav
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brb Monkhouse Stampede, Sun 7 Sep 2025, 18:50,
Reply)
Great feedback. I'll try and integrate a few of those.
FYI, if you press the share button, you will get a link that saves your parameters in the URL. So when opened from that created URL, your unique setup will be loaded
(, Mon 8 Sep 2025, 11:42, Reply)
Good to know, ty.
Camera angle is a bit of a silly one, but I'd be really interested in getting a wav output for this, or better yet, a VST version of this. Chaos oscillators. Mmmm.
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brb Monkhouse Stampede, Mon 8 Sep 2025, 20:16,
Reply)
.wav ? I know that as an audio file. Do you mean an output like you see on films when someone is having a lie detector test?
What are you meaning by camera angle? Send a screenshot if you can
(, Tue 9 Sep 2025, 13:40, Reply)
A waveform, yes.
The different waveforms (like sine, triangle, square) are often named for the shapes they make when plotted on a polar (circular) graph, which looks just like the visual output of your chaos pendulums.
But a .wav is an actual audio file, not just another visualisation.
Here's a clue:
Though I imagine the best place for a zero line would be at 6 o'clock rather than 3.
I can't screenshot a feature that doesn't exist but if you're on Vivaldi go Page Actions/Transform 3d to see approximately 1% of what I mean. If you've ever played a computer game where the 'camera' follows your sprite/avatar around, and you can grab the image and move the camera angle - that!
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brb Monkhouse Stampede, Tue 9 Sep 2025, 15:35,
Reply)
Now I am going to be nit-picky.
Those waveforms get their names from the shapes they make on cartesian plots. A square wave on a polar plot isn't square.
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jonbob loves you, Sat 13 Sep 2025, 5:22,
Reply)
You brought out the gimp used his thingy and played with his pendulums.
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FeralCatMan Unusual disease collector., Sun 7 Sep 2025, 14:59,
Reply)
