blocks|key|3626817|text|Physics+for+Game+Programmers+By+Grant+Palmer+(非Java)|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3626818|Phys2D+(Java代码)|3626819|entityMap|0|LINK|mutability|MUTABLE|url|http://books.google.com/books?id=oVLDoO-V67cC&printsec=frontcover&dq=physics%2Bfor%2Bgame%2Bprogrammers#PPP5,M1|1|http://www.cokeandcode.com/phys2d/^0|0|18|0|0|0|6|1|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]]|C|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@$A|U|B|V|1|W]]|C|$]]|$1|F|3|-4|5|6|7|X|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]|N|$5|I|J|K|C|$L|O]]]]

<a href="http://books.google.com/books?id=oVLDoO-V67cC&amp;printsec=frontcover&amp;dq=physics+for+game+programmers#PPP5,M1" rel="nofollow noreferrer">Physics for Game Programmers By Grant Palmer</a> (not Java)

<a href="http://www.cokeandcode.com/phys2d/" rel="nofollow noreferrer">Phys2D</a> (Java code)

blocks|key|408183|text|假设你想开始学习如何去做，最好的方法就是从纸笔开始。开始定义应用程序的焦点(如实体球体、立方体等，重力、碰撞等规则，决定对象的层次结构等)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|408184|如果您知道如何做到这一点，并且想要了解一下技术方面的入门知识，那么Swing是用Java编写UI的一个很好的选择。|408185|也可以在这里查看：http://www.myphysicslab.com/|offset|length|408186|entityMap|0|LINK|mutability|MUTABLE|url|http://www.myphysicslab.com/^0|0|0|9|S|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@$F|S|G|T|1|U]]|A|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]]]

Assuming you want to get started on how to do it, best way to start is with a Pen and Paper. Start defining focal points of your app (like the entities sphere, cube etc, rules like gravity, collision etc, decide hierarchy of objects etc..)

If you know how to do this, and want a primer on the technology side, Swing is a good option to make UIs in Java. 

Also take a look here: <a href="http://www.myphysicslab.com/" rel="nofollow noreferrer">http://www.myphysicslab.com/</a>

blocks|key|4473360|text|NeHe的第三十九课是一个很好的起点，它是在C%2B%2B中实现的，但它的理论很容易理解。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4473361|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

NeHe's lesson 39 is a good starting point, it's in C++ but the theory is pretty easy to understand.

blocks|key|408413|text|一个不错的java物理库是jmephysics+(http://www.jmonkeyengine.com/jmeforum/index.php?topic=6459)；它非常容易使用，并且位于ODE+(http://www.ode.org/)和jmonkeyengine+(http://www.jmonkeyengine.com)之上，为您提供了一个场景图(http://en.wikipedia.org/wiki/Scene_graph)，这也是除了非常简单的3d应用程序之外您还需要的东西。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|408414|我已经有一段时间没有使用它了，我看到他们从2007年底开始就没有发布过，所以我不确定社区现在有多活跃。|408415|entityMap|0|LINK|mutability|MUTABLE|url|http://www.jmonkeyengine.com/jmeforum/index.php?topic=6459|1|http://www.ode.org/|2|http://www.jmonkeyengine.com/|3|http://en.wikipedia.org/wiki/Scene_graph^0|P|1M|0|2U|J|1|3U|S|2|51|14|3|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@$A|U|B|V|1|W]|$A|X|B|Y|1|Z]|$A|10|B|11|1|12]|$A|13|B|14|1|15]]|C|$]]|$1|D|3|E|5|6|7|16|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|17|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]|N|$5|I|J|K|C|$L|O]]|P|$5|I|J|K|C|$L|Q]]|R|$5|I|J|K|C|$L|S]]]]

A nice java physics library is jmephysics (<a href="http://www.jmonkeyengine.com/jmeforum/index.php?topic=6459" rel="nofollow noreferrer">http://www.jmonkeyengine.com/jmeforum/index.php?topic=6459</a>); it is quite easy to use and sits on top of ODE (<a href="http://www.ode.org/" rel="nofollow noreferrer">http://www.ode.org/</a>) and jmonkeyengine (<a href="http://www.jmonkeyengine.com" rel="nofollow noreferrer">http://www.jmonkeyengine.com</a>) which gives you a scenegraph (<a href="http://en.wikipedia.org/wiki/Scene_graph" rel="nofollow noreferrer">http://en.wikipedia.org/wiki/Scene_graph</a>), again something that you'll need for anything beyond a very simple 3d application.

I haven't used it for some time though, and see that they haven't released since late 2007 so not sure how active the community is now.

blocks|key|408235|text|先为物理对象定义一个类怎么样？它有位置、速度、质量，可能还有其他特征的子类，如形状、弹性等。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|408236|然后创建一个全域(类)来放置这些物理对象。听起来很有趣:)|408237|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

How about first defining a class for physical object? It has position, velocity, mass and maybe subclasses with other features like shape, elasticity etc.

Then create an universe (class) where to place these physical objects. Sounds like fun :)

blocks|key|408269|text|如果你只需要模拟球体/圆和立方体，那么你只需要一点向量数学。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|408270|例如，为了模拟一个简单的台球游戏，每个球(球体)都有一个位置，3D线速度和3D线性加速度矢量。您的模拟将涉及到许多不断更新每个球的小帧。如果两个或更多的球发生碰撞，您只需将向量相加，然后计算所有球的新速度。例如，如果一个球撞到了墙上，所有需要做的就是翻转球的标志，让它反弹回来……|408271|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

If you all you need to simulate is spheres/circles and cubes then all you need is a bit of Vector math.

Eg to simulate a simple pool game each ball (sphere) would have a position, 3d linear velocity and 3d linear acceleration vector. Your simulation would involve many little frames which continually updates each and every ball. If two or more balls collide you simply sum the vectors and calculate the new velocities for all balls. If a ball hits a wall for instance all that is required is to flip the sign of the ball to have it bounce back...

blocks|key|1071739|text|如果你想从头开始做这件事，这意味着编写你自己的物理引擎，你必须了解背后的数学细节才能实现这一点。如果你有相当好的数学背景，你将领先一步，否则前面会有陡峭的学习曲线。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1071740|你可以在这个社区论坛上开始收集关于如何做事情的信息：gamedev.net|offset|length|1071741|当然，如果您不想编写自己的代码，可以使用像Ogre这样的开源引擎。|1071742|entityMap|0|LINK|mutability|MUTABLE|url|http://www.gamedev.net/community/forums/forum.asp?forum_id=20|1|http://www.ogre3d.org/^0|0|Q|B|0|0|L|4|1|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|S|8|@]|9|@$D|T|E|U|1|V]]|A|$]]|$1|F|3|G|5|6|7|W|8|@]|9|@$D|X|E|Y|1|Z]]|A|$]]|$1|H|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]|P|$5|K|L|M|A|$N|Q]]]]

If you want to do this from scratch, meaning coding your own physics engine, you'll have to know the ins and outs of the math behind to accomplish this. If you have a fairly good math background you'll have a headstart otherwise a steep learning curve is ahead.

You can start on this community forum to gather information on how things are done:
<a href="http://www.gamedev.net/community/forums/forum.asp?forum_id=20" rel="nofollow noreferrer">gamedev.net</a>

Ofcourse you could use an opensource engine like <a href="http://www.ogre3d.org/" rel="nofollow noreferrer">Ogre</a> if you don't want to code your own.

blocks|key|3626950|text|看看bulletphysics吧。bulletphysics.com是论坛或check+out+the+project+on+Sourceforge。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3626951|entityMap|0|LINK|mutability|MUTABLE|url|http://www.bulletphysics.com/Bullet/wordpress/|1|http://sourceforge.net/projects/bullet/^0|H|H|0|12|10|1|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]|$A|R|B|S|1|T]]|C|$]]|$1|D|3|-4|5|6|7|U|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]|L|$5|G|H|I|C|$J|M]]]]

Check out bulletphysics. <a href="http://www.bulletphysics.com/Bullet/wordpress/" rel="nofollow noreferrer">bulletphysics.com</a> is the forum or <a href="http://sourceforge.net/projects/bullet/" rel="nofollow noreferrer">check out the project on Sourceforge</a>.

I need to write a very simple 3D physics simulator in Java, cube and spheres bumping into each other, not much more. I've never did anything like that, where should I start? Any documentation on how it is done? any libraries I could re-use?

Where do I start to write/use a 3D physics simulation engine?

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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我需要用Java写一个非常简单的3D物理模拟器，立方体和球体相互碰撞，仅此而已。我从来没有做过这样的事情，我应该从哪里开始呢？有关于如何做到这一点的文档吗？有没有我可以重用的库？

问我从哪里开始编写/使用3D物理模拟引擎？
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