Box2D Forums

Has anyone ported b2RopeJoint to the main flash port?

I see that the Alchemy port has it, but it seems like a big job to port my project over just for that - plus, with the new licensing terms I'd prefer to avoid using native code where possible.

I have just finished porting the b2RopeJoint Hopefully it still proves to be of some use for you - if you have not changed over to the Alchemy port already.

See my blog post for details and the files: http://blog.allanbishop.com/box2d-2-1a-rope-joint-ported-to-as3/

Ah, brilliant, thanks a million.

It seems to cause a crash when the ropejoint gets wedged against two objects:

further update: setting fixedRotation = false on the connected bodies solves the problem.

/edit make that "reduces but does not solve" the problem

So I have been trying to replicate the error by modifying my test environment for the b2RopeJoint by adding in some dynamic and static boxes to try and wedge the rope. I also added in another b2RopeJoint next to the original one. While they do get caught on some boxes, I haven't experienced the #1502 error (except if I randomly spawn a box inside another box). I also set the fixedRotation to true to see if that helped trigger the Error.

Is there anyway you can send me a file that can replicate the problem?

Also, what happens if you replace the b2RopeJoint with a b2DistanceJoint?

I also had another look over the ported code but couldn't see anything obviously wrong. The way I ported it in the first place was to look at the difference between the C++ b2RopeJoint and the C++ b2DistanceJoint as they are already very similar. Then, I could figure out what differences needed to be applied to the b2DistanceJoint of AS3 2.1a to turn it into a b2RopeJoint.

There is a chance there were other changes to the Box2D engine when the b2RopeJoint was introduced that could account for it, or, there could be some bugs still in the Box2DAS3 port.