Comments on: JavaScript physics http://doswa.com/blog/2009/01/16/javascript-physics/ Programming, physics, mathematics Thu, 19 Aug 2010 18:20:38 +0000 hourly 1 http://wordpress.org/?v=3.0.1 By: David http://doswa.com/blog/2009/01/16/javascript-physics/comment-page-1/#comment-1579 David Fri, 11 Jun 2010 03:14:37 +0000 http://doswa.com/?p=68#comment-1579 Collisions would actually be quite easy to implement for this, since it uses Verlet integration. Apply a basic circle-circle collision test, then just modify the particles' positions so they're no longer overlapping. Keep in mind conservation of momentum when modifying the positions. Verlet integration works by implicitly keeping track of the velocity by holding on to the previous position (i.e. $$v = x - x*$$, where $$x*$$ is the previous position), so momentum would be conserved like $$\Delta (m_1 (x_1 - x_1*)) + \Delta (m_2 (x_2 - x_2*)) = 0$$. Collisions would actually be quite easy to implement for this, since it uses Verlet integration. Apply a basic circle-circle collision test, then just modify the particles’ positions so they’re no longer overlapping.

Keep in mind conservation of momentum when modifying the positions. Verlet integration works by implicitly keeping track of the velocity by holding on to the previous position (i.e. v = x - x*, where x* is the previous position), so momentum would be conserved like \Delta (m_1 (x_1 - x_1*)) + \Delta (m_2 (x_2 - x_2*)) = 0.

]]> By: Ben http://doswa.com/blog/2009/01/16/javascript-physics/comment-page-1/#comment-1578 Ben Fri, 11 Jun 2010 01:39:26 +0000 http://doswa.com/?p=68#comment-1578 Great work. Its missing self-collision though. I'm just mentioning this because it looks a bit weird without it. Great work. Its missing self-collision though. I’m just mentioning this because it looks a bit weird without it.

]]> By: David http://doswa.com/blog/2009/01/16/javascript-physics/comment-page-1/#comment-280 David Sat, 29 Aug 2009 20:46:44 +0000 http://doswa.com/?p=68#comment-280 No, but check out Box2DJS - http://box2d-js.sourceforge.net/. It's a full physics engine rather than just a demo. No, but check out Box2DJS – http://box2d-js.sourceforge.net/. It’s a full physics engine rather than just a demo.

]]> By: nniico http://doswa.com/blog/2009/01/16/javascript-physics/comment-page-1/#comment-279 nniico Sat, 29 Aug 2009 19:02:58 +0000 http://doswa.com/?p=68#comment-279 Great demo, but what about collisions, frictions, etc. ? Do you have a more complete engine? Great demo, but what about collisions, frictions, etc. ? Do you have a more complete engine?

]]> By: Chain | Doswa http://doswa.com/blog/2009/01/16/javascript-physics/comment-page-1/#comment-215 Chain | Doswa Tue, 04 Aug 2009 01:47:06 +0000 http://doswa.com/?p=68#comment-215 [...] I made a little Processing sketch based on the same physics as JavaScript physics. [...] [...] I made a little Processing sketch based on the same physics as JavaScript physics. [...]

]]> By: Chain | Doswa http://doswa.com/blog/2009/01/16/javascript-physics/comment-page-1/#comment-10 Chain | Doswa Sat, 24 Jan 2009 08:22:32 +0000 http://doswa.com/?p=68#comment-10 [...] A little Processing sketch based on the same physics as JavaScript physics. [...] [...] A little Processing sketch based on the same physics as JavaScript physics. [...]

]]>