Polygon shapes  colliding using the C++ Box2D library ported to Quartz Composer  :

< Download  and unzip :  tLBox2DConfined.zip . The folder contains :

     < The QCPlugin  file: tLBox2D_Confined.plugin .

     < A Quartz Composer  composition file : tLBox2D_Confined_b1.1.qtz.

   < The XCode project folder : tLBox2D_Confined_b1.0 .