ciel = new Background(new Color3f(0.9f, 0.9f, 1.0f));
ciel.setCapability(Background.ALLOW_COLOR_WRITE);
ciel.setApplicationBounds(new BoundingSphere(new Point3d(0, 0, 0), 80));
parent.addChild(ciel);
parent.addChild(new ColorCube(0.4));
TransformGroup tg = new TransformGroup();
Transform3D translation;
translation = new Transform3D();
translation.setTranslation(new Vector3f (0, 0, 20));