This file comes from Box2D-JS, Copyright (c) 2008 ANDO Yasushi.
  The original version is available at http://box2d-js.sourceforge.net/ under the
  zlib/libpng license (see License.txt).
  This version has been modified to make it work with O3D.
  
  demos.stack = {};
  demos.stack.initWorld = function(world) {
    var sd = new b2BoxDef();
    var bd = new b2BodyDef();
    bd.AddShape(sd);
    sd.density = 1.0;
    sd.friction = 0.5;
    sd.extents.Set(10, 10);
  
    var i;
    for (i = 0; i < 8; i++) {
      bd.position.Set(500/2-Math.random()*2-1, (250-5-i*22));
      // NOTE: Added the following line to create a 3d object to display.
      bd.userData = g.mgr.createBox(10, 10);
      world.CreateBody(bd);
    }
    for (i = 0; i < 8; i++) {
      bd.position.Set(500/2-100-Math.random()*5+i, (250-5-i*22));
      // NOTE: Added the following line to create a 3d object to display.
      bd.userData = g.mgr.createBox(10, 10);
      world.CreateBody(bd);
    }
    for (i = 0; i < 8; i++) {
      bd.position.Set(500/2+100+Math.random()*5-i, (250-5-i*22));
      // NOTE: Added the following line to create a 3d object to display.
      bd.userData = g.mgr.createBox(10, 10);
      world.CreateBody(bd);
    }
  }
  demos.InitWorlds.push(demos.stack.initWorld);