几个球在一个有限的正方形内并且不会互相碰撞
使用box2d，我想将一些球放在一个有限的正方形中。它们不会与其他球碰撞，但在碰到边缘时会回来。我应该赋予球和正方形什么属性？
如果我设置边缘为b2_dynamicbody，球为b2_kinematicbody，球不会碰撞，但它们只是往那里走，与边缘没有反应（边缘随着球移开-_-“）。相反，球会碰撞我希望有某种方法可以忽略球的碰撞但与边缘做出反应。
With box2d,I want to put some balls in a limited square.They will not collide with other balls but will come back when hit the edge.What properties should I give to the balls and square?
If I set the edge is b2_dynamicbody and ball is b2_kinematicbody,balls don't collide but they just go there way and no reaction with the edge(the edge moved away with the balls -_-").To the contrary,balls will collide each other.I hope there is some way to ignore balls' collide but react with the edge.
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这就是安德鲁在上面的评论中回答的答案。我复制了它，让其他遇到同样问题的人看到它已经解决了。非常感谢安德鲁（http://stackoverflow.com/users/444088/andrew）
'看看b2Filter b2Fixture 的属性。 box2d手册中有详细的解释。
另外，这是box2d官方手册的链接
http://www.box2d.org/manual.html
That's the answer which Andrew answered in comment above.I copied it and let others who meets the same problem see it's solved.Best thanks to Andrew(http://stackoverflow.com/users/444088/andrew)
'take a look at b2Filter property of b2Fixture. There is a detailed explanation of it in box2d manual.'
Additional,here is the link to box2d official manual
http://www.box2d.org/manual.html