5 ms·

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.

AshleysBrain 15y ago
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?
- MrNibbles 15y ago
  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 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.
  - AshleysBrain 15y ago
    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!
    - MrNibbles 15y ago
      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.
      - AshleysBrain 15y ago
        Really? Even with FF5's hardware accelerated canvas?
  - franze 15y ago
    the game looks awesome, any plans for a re-release?
- bermanoid 15y ago
  It's also worth checking out GWTBox2d, which is actually Java code run through GWT, and runs surprisingly well: http://gwtbox2d.appspot.com/ http://gwtbox2d.appspot.com/ I'm really impressed with what JS can do these days...

AshleysBrain 15y ago

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?

MrNibbles 15y ago
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 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.
- AshleysBrain 15y ago
  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!
  - MrNibbles 15y ago
    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.
    - AshleysBrain 15y ago
      Really? Even with FF5's hardware accelerated canvas?
- franze 15y ago
  the game looks awesome, any plans for a re-release?
bermanoid 15y ago
It's also worth checking out GWTBox2d, which is actually Java code run through GWT, and runs surprisingly well: http://gwtbox2d.appspot.com/ http://gwtbox2d.appspot.com/ I'm really impressed with what JS can do these days...