Matter.js – A 2D rigid body physics engine for the web

Post by seanmcdirmid » Mon, Jan 19, 2015, 11:51 PM UTC

hngiszmo wrote: post #26

demo request: I want a demo where the user can control a soft body ball such that the ball is comprised of chain segments, connected with string constant k. The pressure of the ball would be calculated depending on the area enclosed by the chain's polygon and would be applied to each segment equally, to the outwards side. Controls would be left/right as a simple added force to all segments of the ball. Jump would be…

Post by nkg » Tue, Jan 20, 2015, 12:08 AM UTC

Post by dyarosla » Tue, Jan 20, 2015, 12:13 AM UTC

maccard wrote: post #38

dyarosla wrote: post #36

Earlier quoted context omitted.

The question then becomes how slow is copying to/from the GPU versus doing the computation on the CPU when it comes to 100s/1000s of active bodies. I agree that normally (small examples) it wouldn't be worth it, but for any large simulations, and say, video games of the future, I have yet to see someone attempt to do this. Perhaps it truly isn't beneficial enough... but who knows.

> The question then becomes how slow is copying to/from the GPU versus doing the computation on the CPU when it comes to 100s/1000s of active bodies. The amount of time spent inside a GPGPU kernel for updating 1000 rigid bodies wouldn't even be as much as the length of time to copy the data back and forth. You've also got to consider the acceleration structure used for the collision detection. If you have a hierarchi…

Post by i_s » Tue, Jan 20, 2015, 1:20 AM UTC

z3t4 wrote: post #33

This is very impressive! The most advanced JS 2d rigid body physics engine to date! You can do a lot of optimization though, probably double the speed. Tip: V8 loves objects and hates parsing strings. Your functional spaghetti style is a bit weird though. I hate using the "find in file" function in my editor. I wanted to "rip" some of the functionality, but it's so entangled I would probably need all your other funct…

Post by hngiszmo » Tue, Jan 20, 2015, 2:58 AM UTC

seanmcdirmid wrote: post #42

hngiszmo wrote: post #26

demo request: I want a demo where the user can control a soft body ball such that the ball is comprised of chain segments, connected with string constant k. The pressure of the ball would be calculated depending on the area enclosed by the chain's polygon and would be applied to each segment equally, to the outwards side. Controls would be left/right as a simple added force to all segments of the ball. Jump would be…

You probably want a soft body physics engine, not a rigid body one. Something that could use Verlet + pressure-based techniques, for example.