ition.Set(10, 400 / 30 + 1.8);
         world.CreateBody(bodyDef).CreateFixture(fixDef);
         bodyDef.position.Set(10, -1.8);
         world.CreateBody(bodyDef).CreateFixture(fixDef);
         fixDef.shape.SetAsBox(2, 14);
         bodyDef.position.Set(-1.8, 13);
         world.CreateBody(bodyDef).CreateFixture(fixDef);
         bodyDef.position.Set(21.8, 13);
         world.CreateBody(bodyDef).CreateFixture(fixDef);
         
         
         //create some objects
         bodyDef.type = b2Body.b2_dy