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diff --git a/o3d/samples/box2d-3d/demos/top.js b/o3d/samples/box2d-3d/demos/top.js
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+// 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.top = {};
+demos.top.createBall = function(world, x, y, rad, fixed) {
+  var ballSd = new b2CircleDef();
+  if (!fixed) ballSd.density = 1.0;
+  ballSd.radius = rad || 10;
+  ballSd.restitution = 0.2;
+  var ballBd = new b2BodyDef();
+  ballBd.AddShape(ballSd);
+  ballBd.position.Set(x,y);
+  // NOTE: Added the following line to create a 3d object to display.
+  ballBd.userData = g.mgr.createCylinder(ballSd.radius);
+  return world.CreateBody(ballBd);
+};
+demos.top.createPoly = function(world, x, y, points, fixed) {
+  var polySd = new b2PolyDef();
+  if (!fixed) polySd.density = 1.0;
+  polySd.vertexCount = points.length;
+  for (var i = 0; i < points.length; i++) {
+    polySd.vertices[i].Set(points[i][0], points[i][1]);
+  }
+  var polyBd = new b2BodyDef();
+  if (points.length == 3) {
+    // NOTE: Added the following line to create a 3d object to display.
+    polyBd.userData = g.mgr.createWedge(points);
+  }
+  polyBd.AddShape(polySd);
+  polyBd.position.Set(x,y);
+  return world.CreateBody(polyBd)
+};
+demos.top.initWorld = function(world) {
+  demos.top.createBall(world, 350, 100, 50, true);
+  demos.top.createPoly(world, 100, 100, [[0, 0], [10, 30], [-10, 30]], true);
+  demos.top.createPoly(world, 150, 150, [[0, 0], [10, 30], [-10, 30]], true);
+  var pendulum = createBox(world, 150, 100, 20, 20, false);
+  var jointDef = new b2RevoluteJointDef();
+  jointDef.body1 = pendulum;
+  jointDef.body2 = world.GetGroundBody();
+  jointDef.anchorPoint = pendulum.GetCenterPosition();
+  world.CreateJoint(jointDef);
+
+  var seesaw = demos.top.createPoly(world, 300, 200, [[0, 0], [100, 30], [-100, 30]]);
+  jointDef.body1 = seesaw;
+  jointDef.anchorPoint = seesaw.GetCenterPosition();
+  world.CreateJoint(jointDef);
+};
+demos.InitWorlds.push(demos.top.initWorld);
+
+