p2.js

Great point. This is why I used p2.js for javascript game physics over franken-emscripten Box2d ports. The readme and source code are extremely accessible (https://github.com/schteppe/p2.js#sample-code). When I was trying to optimize my collision detection, I stepped in to p2.js source to read narrowphase vs broadphase implementations. Last I used Box2d, I was reading c++ pdf documentation.

If you're targeting the web, then you're compiling to Javascript anyways, so the indirection + engine complexity isn't always worth it. Unity tends to pay off as you take on more platform targets and/or implementation complexity (like graphics), for example. It's kinda like using https://github.com/schteppe/p2.js for physics instead of Box2D: if p2 gets the job done, then you get the advantage of working with a much simpler code base than Box2D which is just about impenetrable as an emscripten port.

Thanks for this, it went under my radar. I would also like to see https://github.com/schteppe/p2.js/ Anyway I imagine this tool a little effort so thanks for sharing.

Why is this upvoted so much? In what way is it better than any of the existing JS physics engines? Matter.js: http://brm.io/matter-js/ Cannon.js: http://www.cannonjs.org/ PhysicsJS: http://wellcaffeinated.net/PhysicsJS/ Box2DJS: http://box2d-js.sourceforge.net/ (Emscripten-compiled from flash) p2: https://github.com/schteppe/p2.js Ammo.js: https://github.com/kripken/ammo.js/ (Emscripten-compiled from C++) JPE: https://github.com/colorhook/JPE Oimo.js: https://github.com/lo-th/Oimo.js/ Planck.js: https://github.com/shakiba/planck.js

I am familiar with P2 JS, looked through PhysicsJS and the two very basic arcade engines grown within Phaser JS. Matter JS seems to have the exact same feature set like any other library. I haven't seen any 2D web engine, besides the JS ports of Box2D, which supports continuous collision detection (CCD), which would prevent a lot of tunneling, especially on slower mobile phones. Why is that? CCD doesn't look more complex in theory than any other concept in a 2d physics engine. P2JS: https://github.com/schteppe/p2.js PhysicsJS: http://wellcaffeinated.net/PhysicsJS/ Phaser: http://phaser.io/

I wonder how it compares to p2.js[1], another recent 2D physics engine, but created by the same person who created the 3D physics engine Cannon.js[2] [1] https://github.com/schteppe/p2.js [2] https://github.com/schteppe/cannon.js