JavaScript Physics Engine | Hacker News Reader

JavaScript Physics Engine

code.google.com

140 pointsbauchidgw22 comments

I open sourced my "toy" version of JavaScript physics engine just few days ago too. It's not really for serious work, but may be (hopefully) simple and good enough for beginning programmers to learn one way of starting such a project. https://github.com/fuzzthink/SPE.js

It looks good. Have you tested it with SVG? I've been using https://github.com/hrj/box2d-js

Thanks! No, haven't had the time to do an SVG demo, but that shouldn't stop anyone from doing so ;) Thanks for the link, didn't know about jquery.svg, maybe I'll play around with that if I find the time or no one builds one already.

All the physics engines in JS are documented on the very valuable JSWiki: https://github.com/bebraw/jswiki/wiki/Physics-libraries

Very nice, but where is this alleged AS3 to JavaScript converter? That sounds quite useful!

I've been (very) slowly porting an AS3 site to JS/jQ, mostly as a learning experience, but I'd be quite interested in this as well.

The performance of the demo is awesome. Has anyone tried to do anything more complicated and tested performance. Would be fun to make a js game from this.

TBH it's a small demo - I've heard while JS engines these days are fast, they still struggle with complex physics simulations. I can't see any performance details/improvements noted in this release - anyone got figures?

Untrue, I used a port of Box2d (not this port, our own version) to build an "HTML5" game for sony, see link - http://www.youtube.com/watch?v=AicnuLQxHoQ

Unfortunately the game was taken down due to the Japan situation. Understandable.

Under Safari i was able to simulate ~80 live physics objects in a high collision environment at full frame render, bound to the DOM at 60fps on reasonable hardware 6 months ago (safari still has the fastest DOM paint time out there now).

Even when using Firefox 3.6 i could manage around 20 dynamic objects.

No CSS3 animation, just math and re-paints.

Javascript Math is not slow (at all), its generally the DOM/Canvas slowing you down.

If you've ever used the C++ Box2D, you'll have been able to create hundreds of objects just fine. 80 still isn't much!

Of course! This is now nearly possible in Chrome/Safari/FF5, but the limiting factor is still primarily re-paint time rather than the simulation itself.

Really? Even with FF5's hardware accelerated canvas?

the game looks awesome, any plans for a re-release?

It's also worth checking out GWTBox2d, which is actually Java code run through GWT, and runs surprisingly well: http://gwtbox2d.appspot.com/

I'm really impressed with what JS can do these days...

Cool, how is this diferent from http://box2d-js.sourceforge.net/

Well... its demo is way cooler, for one. =)

Seriously, I'm having way too much fun swinging this ball around and smashing things. Package it up for $0.99 IMO.

Huzzah! http://imageshack.us/f/839/towerofpower.jpg/

http://desmond.imageshack.us/Himg94/scaled.php?server=94&...

Here's a more permanent home for it. http://www.atomitware.tk/games/box2dwebdemo.html

In the project, it says box2d-js.sf isn't being updated anymore. Would've been nice to take over the older project so people who were using that one would know there was renewed interest in maintaining this code.

hopefully this one keeps active looks very good

It's really flickery in Ubuntu 10.10 / Chrome/

FYI, I am on 11.04 / Chrome and do not see any flicker

Reply on news.ycombinator.com