Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & Contributors3D Billiard Loop in a Rectangular Boxhttp://demonstrations.wolfram.com/3DBilliardLoopInARectangularBox/]]>http://demonstrations.wolfram.com/3DBilliardLoopInARectangularBox/