Box2D Forums

Very new to this but I believe this may be the answer:

Making sure you're using the .mm extension for your implementation code, I simply added this to my header file:

#ifdef __cplusplus
#import "Box2D/Include/Box2D.h"
#endif

I was the able to compile successfully using the latest code from SVN (though of course it probably works with the latest official release - I haven't checked) and make references to classes such as b2World and b2Body directly from my Objective-C interface section.

Hope that helps.

worldAABB.lowerBound.Set(-100.0f, -100.0f);
worldAABB.upperBound.Set(100.0f, 100.0f);

please tell the meaning of these coordiantes
what is significance of these coordinates.

In the old Box2D, the world has a set size. That size is just a box whose lower bound is -100,-100 and whose upper bound is 100,100. Any bodies outside that size will stop moving and be sent to the listener.

-P

Thanks