if (orientation == null) {
throw new IllegalArgumentException("Null 'orientation' argument.");
}
CategoryAxis categoryAxis = new CategoryAxis3D(categoryAxisLabel);
ValueAxis valueAxis = new NumberAxis3D(valueAxisLabel);
// create the renderer...
CategoryItemRenderer renderer = new StackedBarRenderer3D();
if (tooltips) {
renderer.setToolTipGenerator(new StandardCategoryToolTipGenerator());