/**
* Builds the sky box.
*/
private Skybox buildSkyBox() {
final Skybox skybox = new Skybox("skybox", 10, 10, 10);
final String dir = "images/skybox/";
final Texture north = TextureManager
.load(dir + "1.jpg", Texture.MinificationFilter.BilinearNearestMipMap, true);
final Texture south = TextureManager
.load(dir + "3.jpg", Texture.MinificationFilter.BilinearNearestMipMap, true);
final Texture east = TextureManager.load(dir + "2.jpg", Texture.MinificationFilter.BilinearNearestMipMap, true);
final Texture west = TextureManager.load(dir + "4.jpg", Texture.MinificationFilter.BilinearNearestMipMap, true);
final Texture up = TextureManager.load(dir + "6.jpg", Texture.MinificationFilter.BilinearNearestMipMap, true);
final Texture down = TextureManager.load(dir + "5.jpg", Texture.MinificationFilter.BilinearNearestMipMap, true);
skybox.setTexture(Skybox.Face.North, north);
skybox.setTexture(Skybox.Face.West, west);
skybox.setTexture(Skybox.Face.South, south);
skybox.setTexture(Skybox.Face.East, east);
skybox.setTexture(Skybox.Face.Up, up);
skybox.setTexture(Skybox.Face.Down, down);
skybox.setRotation(new Quaternion().fromAngleAxis(MathUtils.HALF_PI, Vector3.UNIT_X));
return skybox;
}