*/
public NonRisingVisitor(Mask mask, RegionFunction function) {
super(mask, function);
Collection<Vector> directions = getDirections();
directions.clear();
directions.add(new Vector(1, 0, 0));
directions.add(new Vector(-1, 0, 0));
directions.add(new Vector(0, 0, 1));
directions.add(new Vector(0, 0, -1));
directions.add(new Vector(0, -1, 0));
}