I’ve talked about the basics of Box2DFlash v1.4.3 in my Introductory tutorial. I showed how to create your world and how to introduce simple bodies into that world. With the release of Box2DFlash v2.0.0 the basics remain mostly the same, there are a few details changed. I need to go over these small changes before I move on to the next step of adding joints and forces to the bodies.

The first and biggest change (although really a small thing) is that we no longer work in pixels! We now work in units that by default equal 30 pixels to 1 unit (think of it as meters; 30px : 1m). With this change our normal gravity is no longer (0, 300) but instead (1, 10). This makes more sense to me at least because gravity in reality is 9.81 m/s/s. This is going to effect almost everything you do, from applying forces to setting the width and height of a box.

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Box2DFlash v2.0.0 was finally released on the 17th of this month (April). Box2DFlash is the Flash AS3 port of Erin Catto’s C++ physics engine Box2D. Erin Catto is a physics programmer at Blizzard Entertainment (WarCraaaft!). I’ve been looking forward to this release since I found out about it while making a tutorial for the previous release (v1.4.3) about a month ago.
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After writing my introduction tutorial to Erin Catto’s Box2D AS3 physics engine port, I found out that I was writing about version 1.4.3. Well a new version (v 2.0.0) is set to come out within the next few weeks, so I thought that I would put off any more tutorials on Box2DFlash till I find out what has changed.

Until then, I’ve found a bunch of fun games made with the Box2D engine and I thought I would share them with you.

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I wanted to try something fun with Flash this week, so I did a quick search for “Flash Physics Engine.” Lo and behold, I struck gold. Box2DFlashAS3 is an open source ActionScript 3.0 conversion of the C++ Physics Engine Box2D. I’m very impressed with its well coded structure and easily implemented nature. I learned a few new things that will change how I code forever just by reading through their example files.

Still, they have limited resources right now as far as help documentation goes (”Please refer to the source code from the examples provided to get an idea of how to use Box2DFlash in your projects.” — that’s the ReadMe.txt that comes with it… not very helpful,huh). I thought I might give you an example of my own and walk through it step by step.
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