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Version 3.1.1

This release of dyn4j was focused on performance and the API. Many API changes, both breaking and non-breaking, have been made. See the Release Notes for more details. Many new small features have been made as well.

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Posted on July 21, 2012

Algorithmic and Architectural Gaming Design: Implementation and Development

Algorithmic and Architectural Gaming Design: Implementation and Development covers a myriad of game development topics. But what sets this book apart, in my opinion, is the focus on actual implementation.

Posted on June 04, 2012

Version 3.1.0

The latest release of dyn4j adds a number of new features. See the the release notes. It also contains a number of important bug fixes. On the other hand, the API has been changed slightly and may break code written against older versions.

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Posted on May 05, 2012

Version 3.0.3

Version 3.0.3 is a maintenance release with very few changes. The primary change was the move of the Settings class from being a singleton to being a member of the World class. This allows each instance of the World class to have different settings. The changes may break compatibility with previous versions, although they should be minimal.

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Posted on March 03, 2012

dyn4j Project Setup Video

I finally got some time to create my first How-To video for the dyn4j project.  The first video describes how to setup a Java project in Eclipse to use dyn4j.  It’s short and hopefully to the point.

Posted on December 29, 2011

Version 3.0.2

3.0.2 introduces significant changes in the Sandbox application along with some minor bug fixes to dyn4j and some new features. Specifically, small CCD improvements, a new fixture filter TypeFilter, and tangent speed settings on contacts. Bug fixes include: a fix to the Body.setMass(Mass.Type) method, auto-sleeping bug, and a rotation disc computation bug. In addition, both dyn4j and Sandbox have been internationalized (any volunteers for translating?).

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Posted on December 20, 2011

Contact Points Using Clipping

Many have asked “How do I get the contact points from GJK?” or similar on the SAT, GJK, and EPA posts. I’ve finally got around to creating a post on this topic. Contact point generation is a vital piece of many applications and is usually the next step after collision detection. Generating good contact points is crucial to predictable and life-like iteractions between bodies. In this post I plan to cover a clipping method that is used in Box2d and dyn4j. This is not the only method available and I plan to comment about the other methods near the end of the post.

Posted on November 17, 2011

Version 3.0.1

3.0.1 incorporates many small changes. JUnit test, the TestBed and a new testing/demo application, Sandbox, have been moved around to better structure the project. Many major and minor bug fixes have been made. The most visible change is the normalization of the Joint class methods. In addition, the WeldJoint class now supports a soft joint setting.

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Posted on October 03, 2011

Version 3.0.0

3.0.0 incorporates big changes to the library. The base package has been changed, the broadphase collision detection code has been updated adding 3 new implementations, many bug fixes and performance enhancements, a new joint, better documentation, many more JUnit tests, new example applications, and more.

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Posted on June 05, 2011

How A Differential Gear Works

Had a friend of mine send me a link to this video on YouTube from the 1930’s explaining how a differential works. This video does a great job of explaining the concept and possibly the thought process that was used to develop it.

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Posted on March 29, 2011

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Bible Collision Detection Constrained Dynamics Contacts EPA Equality Constraints GJK Game Development Java One God OpenGL Physics SAT dyn4j
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