private function createWalls():void
{
	 var wallShapeDef:b2PolygonDef = new b2PolygonDef();
	var wallBodyDef:b2BodyDef = new b2BodyDef();
	var wall:b2Body;
 
	//Left and Right Shape Definition
	wallShapeDef.SetAsBox(100/WORLD_SCALE, (HEIGHT+40)/WORLD_SCALE/2);
 
	// Left
	wallBodyDef.position = new b2Vec2(-95 / WORLD_SCALE, HEIGHT/WORLD_SCALE/2);
	wall = world.CreateBody(wallBodyDef);
	wall.CreateShape(wallShapeDef);
 
	// Right
	wallBodyDef.position = new b2Vec2((WIDTH+95) / WORLD_SCALE, HEIGHT/WORLD_SCALE/2);
	wall = world.CreateBody(wallBodyDef);
	wall.CreateShape(wallShapeDef);
}

private function createCubes():void
{
	for (var i:Number = 0; i < 10; i++)
	{
		var boxWidth:Number = Math.random() * 20 + 10;
 
		var boxBody:b2BodyDef = new b2BodyDef();
		boxBody.position = new b2Vec2(Math.random() * WIDTH / WORLD_SCALE, Math.random() * 50 /WORLD_SCALE);
 
		var box:b2Body = world.CreateBody(boxBody);
 
		var boxShape:b2PolygonDef = new b2PolygonDef();
		boxShape.SetAsBox(boxWidth/WORLD_SCALE, boxWidth/WORLD_SCALE);
		boxShape.density = .7;
		boxShape.friction = .3;
		boxShape.restitution = .9;
 
		box.CreateShape(boxShape);
 
		box.SetMassFromShapes();
 
		var materialsList:MaterialsList = new MaterialsList();
		materialsList.addMaterial(new WireframeMaterial(Math.random() * 0xffffff), "all");
		var cube:Cube = new Cube(materialsList, boxWidth * 2, boxWidth * 2, boxWidth * 2);
 
		scene.addChild(cube);
		box.m_userData = cube;
	}
}