http://www.macnn.com/articles/09/12/14/new.api.registers.callbacks.for.collision.events/
Chipmunk 5.0 adds Raycasting, adjustable parameters
updated 12:10 am EST, Mon December 14, 2009
New API registers callbacks for collision events
Howling Moon Software has announced a new version of its 2D physics engine, Chipmunk 5.0. The software is geared toward game developers, with tools for broad-phase collision detection and impulse solving. The update offers a new system for joints and constraints, now with adjustable parameters, as well as enhanced flexibility and programmability.
Version 5 includes a new Raycasting feature and a collision-callback API that registers separate events. Users can also utilize collision shapes that can call callbacks without generating collisions.
Chipmunk 5.0 is now available for free under the MIT License, although users can donate to the creators to help support future development.
