This video demonstrates how to listen for collisions and trigger events at the moment of collision in Box2D.

Read along: http://natureofcode.com/book/chapter-5-physics-libraries/#chapter05_section13

https://github.com/shiffman/The-Nature-of-Code-Examples/tree/master/Processing/chp5_physicslibraries/box2d/NOC_5_9_CollisionListening
https://github.com/shiffman/The-Nature-of-Code-Examples/tree/master/Processing/chp5_physicslibraries/box2d/CollisionListeningDeletionExercise
https://github.com/shiffman/The-Nature-of-Code-Examples/tree/master/Processing/chp5_physicslibraries/box2d/CollisionsAndControl

(Note to self: I forgot to mention how to deal with deleting/modifying the body upon collision.)

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