[RC] Box2D

[Looki]

Hi all,

It took me a while, I'm close to finishing the Box2D flash port.

There are a few problems caused by incompatibilities between the EXE and the Flash library of the Box2D libraries and I can't really fix these unless I invest a *LOT* of time - and even then I might not be able to. I've also dropped a few things because they are rather complex but not used very often, it seems.

Changes from the latest beta:

• More expressions.
• Contact filtering
• More stable object/body linkage
• All "create" (joint etc.) actions are now implemented.

Here's a list of what might not work:

• Ray-casting can go through walls in really rare, odd cases. This seems like a library issue.
• Edge chains work differently: Each edge is a shape in Flash. This causes some actions that modify edge chains to be unsupported.
• It seems like Box2D Flash handles sleeping differently. Bodies might fall asleep even if they shouldn't. You can manually disable sleeping for them or uncheck "Allow sleeping" in the properties.
• Body definition strings are not supported.
• Working with custom mass might cause unwanted behaviour! From what I know it should work, but it works a lot different in Flash, so it's a source for problems...
• Some expressions may not work properly at all. *SOME* - Most of them should work perfectly! It's just that I didn't have the time to test them all properly! RevoluteJointAngle seems to behave weirdly sometimes. I really have no idea why.

The testbed seems to work fine - except for the issues that I mentioned which are partially present there (the raycasting issue and Sticky Bodies 2 jiggles weirdly sometimes). So yeah, it seems like your chances of being successful when opening an old Box2D project and porting it to Flash are pretty high.

This is a Release Candidate - There's still room for bug reports. I just think this version is good enough from what I know - feel free to prove me wrong. Just note that I can't really provide 100% compatibility - the library differences make this way too difficult, sorry.

Grab it here:
http://clickteam.info/looki/Extensions/Flash/B2D.zip

Testbed:
http://clickteam.info/looki/Stuff/Testbed.html

[Fanotherpg]

Congratulations, you have been working hard on this!

[Looki]

Thanks! Update: 2 new fixes (bugs found by the great Outcast!). When linking an object, specifying "0 (no object)" for rotation now works (The body will rotate, but the Active won't). Also, the body type is now guaranteed to update every time you add/alter shapes (A body is static if all its shapes have a density of zero).

[Fernando]

Thank you very much!

[happygreenfrog]

Ooh! Can't wait to try this version! *Downloads*

[Outcast]

Thanks! Update: 2 new fixes (bugs found by the great Outcast!). When linking an object, specifying "0 (no object)" for rotation now works (The body will rotate, but the Active won't). Also, the body type is now guaranteed to update every time you add/alter shapes (A body is static if all its shapes have a density of zero).

Great I am humbled

[oruga]

wow! mind-blowing indeed thanks a lot for sharing this!

[Xhadoe]

Do you have any tutorials or examples you could please put together on how to use at least a few of the features for Flash Apps? (Documentation, or walk throughs?)

Thanks =)

[happygreenfrog]

Based on the features I know are supported (based on Looki's list), I'm starting work on making a simple tutorial that focuses on flash Box2D, but also works for standard Box2D.

I've already finished Section 1: Differences and limitations in flash, so it's getting progress...

[Xhadoe]

Looking forward to it!! =)