Doc Block posted:

there's an elasticity coefficient that determines how "bouncy" the particles are when they hit each other. the higher the number, the less energy they lose when they collide. for that simulation it was 0.05, which is pretty low. 0.0 = no elasticity, so if a particle were to hit, say, the ground, it wouldn't bounce at all, whereas a particle with 1.0 elasticity would bounce forever.

they're also "bouncy" because of the way the physics system works. it's a discrete step solver, meaning it moves each particle just a little bit according to its velocity and direction, then checks for collisions, deals with those collisions (calculating new velocities and directions, etc.), then moves the particles a little again, and so on.

a consequence of this is that particles can wind up overlapping after the move portion of each step, and if that happens they get forced apart until they stop overlapping, which can cause them to then overlap with different particles on the next step, in turn causing a cascade of particles overlapping and then being forced apart, which is part of the reason there's the big *POOF* of particles in that simulation.

but i came up with an even cooler one, but which suffers pretty badly from a combination of bouncy particles and the aforementioned overlap cascade:


i wasn't really sure what to expect with that one (~45 minutes to simulate & render), and was hoping for something like the effect at the end of each level in Doom where it would just slide down the screen and come apart, but this was pretty

TRON JEREMY posted:

i'll be posting in/around/all over this thread. for an example of the smaller idiot projects i do, peep the sig

Snapchat A Titty posted:

my brother came by with the nephews so we went crab fishing and i didnt get to draw anything in the weekend, but i took a pic of one of the crabs and just did a quick sketch of it



its a bit poo poo tbh

echinopsis posted:

Luigi Thirty posted:

that's not actually what happens I just came up with that w/r/t buttcoins