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Beat balls by Archee [web]
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added on the 2023-09-10 06:09:03 by archee  |
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This one were as we say in Sweden.. Förbannat grymt!
rulez added on the 2023-09-10 09:20:09 by MetRebelS 
Cute
I found this funny in unexpected ways.
It's apparent that you are running your physics backwards, launching balls to be emitted at just the point in time where they should be touching on the beat, and then running all the collision physics backwards from that (after all, the individual collision process is time-symmetric).
But since your physical simulation of this many-particle system basically runs backwards in time, you've got entropy constantly decreasing in the system.
I can't quite put my finger on what it is, but I get the feeling that it *looks wrong*.
Like an intuitive sense that entropy is decreasing instead of increasing, as it should. Fun!
It's apparent that you are running your physics backwards, launching balls to be emitted at just the point in time where they should be touching on the beat, and then running all the collision physics backwards from that (after all, the individual collision process is time-symmetric).
But since your physical simulation of this many-particle system basically runs backwards in time, you've got entropy constantly decreasing in the system.
I can't quite put my finger on what it is, but I get the feeling that it *looks wrong*.
Like an intuitive sense that entropy is decreasing instead of increasing, as it should. Fun!
what urs said.
balls touching!
Quote:
Wrong guess. It's only simulated forwards. Your idea is interesting, though, you would still need to simulate it forward too from the drum-hit. Also notice, that some balls hit both drums or one drum twice before leaving the cage. The collisions are fully elastic, there is no change in kinetic energy. I should have made it lossy to look real.I found this funny in unexpected ways.
It's apparent that you are running your physics backwards, launching balls to be emitted at just the point in time where they should be touching on the beat, and then running all the collision physics backwards from that (after all, the individual collision process is time-symmetric).
But since your physical simulation of this many-particle system basically runs backwards in time, you've got entropy constantly decreasing in the system.
I can't quite put my finger on what it is, but I get the feeling that it *looks wrong*.
Like an intuitive sense that entropy is decreasing instead of increasing, as it should. Fun!
Pourquoi faire simple quand on peut faire compliqué.
All this is very confusing but it makes a lot of sense. 🙃
All this is very confusing but it makes a lot of sense. 🙃
great
Very cool concept, Archee ! I was also thinking about the balls not slowing down due to friction or kinetic energy, but somehow I have a feeling it would have a negative effect on the sound evolution or just in the end everything would stop, I mean also a drummer needs to put some energy in his sticks all the time :-) ...or it works like a pinball, speeding up the balls again...
Ahh, that physics!
Good good shit, how did you solve the elastic collisions? This looks so cool.
Quote:
Elastic collisions are pretty simple in analogue physics. as a three-way collision can't happen exactly at the same time. (this is analogue physics, for faster retries during precalc) Good good shit, how did you solve the elastic collisions? This looks so cool.
Code:
vec2 d1 = normalize(poss[k]+vels[k]*nextcollistime[j] - (poss[j]+vels[j]*nextcollistime[j]));
d1 = d1 * dot(vels[j] - vels[k], d1);
vels[j] -= d1;
poss[j] += d1 * nextcollistime[j];
vels[k] += d1;
poss[k] -= d1 * nextcollistime[j];
typical archee style. which is good =)
:)
cool
Very nice! Congrats Archee!
nice idea!
Very nice idea a pinball games machine with things that makes different sound
Cooool!
Great
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