I once wrote a similar simulation in C: https://github.com/kgabis/gravitysim
It uses Barnes-Hut algorithm, so it runs in nlogn, instead of n^2.
Gravity Simulator
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Re: Gravity Simulator
#22Would love a setting to select the number of objects to drop on click, and the spread for them ie (20 objects, 50px radius) and also for objects to gain the mass of objects that hit them, so that if a bunch of huge objects collide, they create a super-object
Re: Gravity Simulator
#23Would love a setting to select the number of objects to drop on click, and the spread for them ie (20 objects, 50px radius) and also for objects to gain the mass of objects that hit them, so that if a bunch of huge objects collide, they create a super-object
> for objects to gain the mass of objects that hit them, so that if a bunch of huge objects collide, they create a super-object
That's already what happens here.
Re: Gravity Simulator
#24Next step: add dark matter
My simulator models dark energy (dark matter might be very difficult to model, since we don't understand it):
Re: Gravity Simulator
#25Quote: "Particle mass is log of radius". Why not use real physics and make the mass proportional to the cube of the radius? It's also easier to compute. In fact, taking the log of the radius goes in the wrong direction -- the mass of a planet really does increase as the cube of its radius, which changes in a way opposite to log(). Oh, well. Here's my gravity simulator -- it uses JavaScript, no flash required: http://…
> "Particle mass is log of radius"
They seem to have corrected the sentence now: "particle radius is log of mass".
Wow, your simulator is much nicer, plus a great article about it to boot! You should add an option to play cosmic billiard, that's probably the main appeal of the flash simulator :)
Re: Gravity Simulator
#26I did something similar on 3d but is not on realtime and generate outputfiles that could be ploted with gnuplot. It uses an third order Euler integration. Some day I should write a realtime mode for it:
Re: Gravity Simulator
#27I did something similar, but with combat - ships, lasers and missiles.
There are a couple of variations, and some tweaks like the ships accelerating perpendicular to the planets so they don't crash land.
Re: Gravity Simulator
#28If you're interested in learning some of the basics behind this kind of simulation I highly recommend the Nature of Code by Daniel Shiffman - lots of physics and programming fun.
Re: Gravity Simulator
#29Such an amazing simulator to play with. I can only imagine how breath-taking this can be for kids to play around, plus it teaches physics!
Re: Gravity Simulator
#30Built something similar in C/GL a few years back. Quite a fun exercise, it only took a couple of hours to get the basics working. It has no collision detection, so particles that end up too close end up with infinite velocity, which is quite fun to watch.
EDIT: oh hey, I found a binary. https://www.dropbox.com/s/ihfqnzjaxhtskwt/Screenshot%202014-...
