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Angle Constraint

The next equality constraint we will derive is the angle constraint. An angle constraint can be used to join two bodies forcing them to have the same rotation. This particular constraint will be added to other constraints (in later posts) to form more complex constraints.

Posted on December 30, 2010

Line Constraint

The next equality constraint we will derive is the line constraint. A line constraint is like a prismatic constraint (which will most likely be the next post) except allows rotation about the anchor point. A prismatic constraint constraints the linear motion of the bodies along a line. An example of a prismatic joint might be a roller coaster on the track. The cars cannot translate or rotate except along the track. For simplicity the prismatic constraint we will define is only for straight lines.

Posted on December 30, 2010

Pulley Constraint

The next equality constraint we will derive is the pulley constraint. A pulley constraint can be used to join two bodies at a fixed distance. In addition, the constraint can be used to simulate a block-and-tackle.

Posted on December 30, 2010

Weld Constraint

The next equality constraint we will derive is the weld constraint. A weld constraint can be used to join two bodies at an anchor point in which the bodies must move and rotate together (all DOF are constrained).

Posted on December 30, 2010

Version 2.2.1

The new version, 2.2.1, features one more joint, RopeJoint and a few minor bug fixes involving SecurityExceptions for sand-boxed environments. See the javadocs for more details.

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Posted on December 26, 2010

Max Distance Constraint

As a follow up post to the Distance Constraint post, we can also create a maximum distance constraint using the same solution we found in the Distance Constraint post.

Posted on December 18, 2010

Version 2.2.0

The new version, 2.2.0, features convex hull and convex decomposition algorithms. Intended for use during runtime or for pre-processing. See the javadocs for more details.

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Posted on November 20, 2010

Version 2.1.0

The next release of dyn4j is ready! The new version, 2.1.0, features a new PulleyJoint and multi-threading support.

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Posted on September 23, 2010

Distance Constraint

The next equality constraint we will derive is the distance constraint. A distance constraint can be used to join two bodies at a fixed distance. It can also be used as a spring between two bodies.

Posted on September 11, 2010

A Few Services Ago

A few services ago we had one of our Youth Ministers preach. The topic wasn’t necessarily about the Biblical teaching of One God, however some verses used in the sermon really stand out:

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Posted on September 11, 2010