@Test
public void testGetKeys() {

	List<Vector3> list = getTree().getKeys();
	Collections.sort(list, (o1, o2) -> (int) (o1.getX() - o2.getX()));
	System.out.println(list.toString());
	List<PointData<String>> keyValues = getTree().getKeyValues();
	System.err.println(keyValues);
}