blocks|key|2836916|text|这一基本原则是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2836917|http://pastebin.com/9vzZUbTT|offset|length|2836918|所有夹具的用户数据都应该有自己的特定名称。|2836919|这对我有用！|2836920|实体类包含主体和夹具。|2836921|编辑:也许不是你想要的，但这是|2836922|Edit2+:像这样的http://pastebin.com/Cw0R7hmq，可能有很多编译错误，但是我希望你能理解我想说的话。|2836923|entityMap|0|LINK|mutability|MUTABLE|url|1|http://pastebin.com/Cw0R7hmq^0|0|0|S|0|0|0|0|0|0|B|S|1|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@]|9|@$D|10|E|11|1|12]]|A|$]]|$1|F|3|G|5|6|7|13|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|14|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|15|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|16|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|17|8|@]|9|@$D|18|E|19|1|1A]]|A|$]]|$1|P|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|Q|$R|$5|S|T|U|A|$V|C]]|W|$5|S|T|U|A|$V|X]]]]

This basics is this : 

<a href="http://pastebin.com/9vzZUbTT" rel="nofollow">http://pastebin.com/9vzZUbTT</a>

All your fixture's user data should have a own specific name. 

This works for me!

The entity class contains the body and fixture.

Edit: Might not what you want to have, but it's something

Edit2 : <a href="http://pastebin.com/Cw0R7hmq" rel="nofollow">http://pastebin.com/Cw0R7hmq</a> Something like this, there's probably alot of compile error, but I hope you get what I'm trying to say.

blocks|key|233735|text|使用一个CollisionListener并检查您的夹具/主体的用户数据的类型。然后你想怎么处理就怎么处理。如果不希望播放器/子弹碰撞有响应，则应该禁用preSolve中的preSolve(通过Contact.setEnabled(false))并标记要销毁的子弹。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|233736|在这种情况下，有一个强大的碰撞处理系统是必要的。我创建了一个要点，它展示了我是如何通过所谓的CollisionHandlers实现的，它负责每一种类型的EntityA与EntityB碰撞。CollisionFilter可以预先过滤冲突总数，然后CollisionListener将确定正确的CollisionHandler并将回调转发给这些CollisionHandler。它使用反射，可能不是处理大量物体和碰撞的最快方法，但到目前为止，我在这里没有遇到任何问题。|233737|你可以在这里找到要点。|233738|entityMap|0|LINK|mutability|MUTABLE|url|http://libgdx.badlogicgames.com/nightlies/docs/api/com/badlogic/gdx/physics/box2d/Contact.html#setEnabled%2528boolean%2529|1|https://gist.github.com/nooone/10593791^0|4|H|24|8|2E|8|2P|P|2P|P|0|0|1A|G|2M|F|3E|H|41|G|4Q|G|0|0|B|1|0^^$0|@$1|2|3|4|5|6|7|T|8|@$9|U|A|V|B|C]|$9|W|A|X|B|C]|$9|Y|A|Z|B|C]|$9|10|A|11|B|C]]|D|@$9|12|A|13|1|14]]|E|$]]|$1|F|3|G|5|6|7|15|8|@$9|16|A|17|B|C]|$9|18|A|19|B|C]|$9|1A|A|1B|B|C]|$9|1C|A|1D|B|C]|$9|1E|A|1F|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|1G|8|@]|D|@$9|1H|A|1I|1|1J]]|E|$]]|$1|J|3|-4|5|6|7|1K|8|@]|D|@]|E|$]]]|K|$L|$5|M|N|O|E|$P|Q]]|R|$5|M|N|O|E|$P|S]]]]

Use a <code>CollisionListener</code> and check the user data of your fixtures/bodies for the type. Then you can handle it however you want. If you don't want the player/bullet collision to have a response, you should disable the <code>Contact</code> in <code>preSolve</code> (via <a href="http://libgdx.badlogicgames.com/nightlies/docs/api/com/badlogic/gdx/physics/box2d/Contact.html#setEnabled%28boolean%29" rel="nofollow"><code>Contact.setEnabled(false)</code></a>) and mark the bullet to be destroyed.

Having a powerful collision handling system is necessary in this case. I've created a gist which shows how I do it via socalled <code>CollisionHandler</code>s. which are responsible for each type of EntityA vs EntityB collisions. The <code>CollisionFilter</code> can already pre-filter the collisions in total and the <code>CollisionListener</code> will then determine the correct <code>CollisionHandler</code> and forward the callbacks to those. It uses reflection and might not be the fastest approach with a lot of bodies and collisions, but so far I didn't ran into any problems here.

<a href="https://gist.github.com/nooone/10593791" rel="nofollow">You can find the gist here.</a>

In <code>Box2d</code>, as much as i understood, objects have a default collision response, which lets them stop movement or bounce back (if you set a restitution). 
Also you can say, that the object is a sensor and so you can implement your own collision response. 
Now i would like to use the default collision response for some kinds of collisions, while i want to have full controll of collisions with specific objects. 
For example: A player should stop movement or bounce back, if he collides with a wall, but it should loose Hp, when he collides with a bullet and the bullet should be removed. 
So i would like to have something like the contact filters, but the objects, which do not match the filter should react with the default behaivor. 

Is something like this possible? 
How can i do that?

Thanks

Libgdx Box2D controll collision response for a few specific objects only

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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在Box2d中，正如我所理解的那样，对象具有默认的碰撞响应，它允许对象停止移动或反弹(如果您设置了恢复)。此外，您可以说，对象是一个传感器，因此您可以实现您自己的碰撞响应。现在，我想对某些类型的冲突使用默认的冲突响应，而我希望完全控制与特定对象的碰撞。例如:玩家应该停止移动或反弹，如果他与墙壁碰撞，但当他与一颗子弹相撞...

问Libgdx Box2D只控制少数特定对象的碰撞响应。
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