At first I thought I was being bit by RT-17024, but actually this appears to be something different. The odd thing is that it is triggered by a change in whether the scene is using a depth buffer. My first guess is that it is a problem in picking.


public class HelloRectangle3D extends Application {
    @Override public void start(Stage stage) throws Exception {
        Rectangle background = new Rectangle(300, 300, Color.PURPLE);
        background.setRotationAxis(Rotate.Y_AXIS);
        background.setRotate(45);

        Rectangle rect = new Rectangle(200, 200);
        rect.setFill(new LinearGradient(0, 0, 0, 1, true, CycleMethod.NO_CYCLE, new Stop(0, Color.ORANGE), new Stop(1, Color.ORANGE.darker().darker())));
        rect.setArcHeight(42);
        rect.setArcWidth(42);
        rect.setStroke(Color.WHITE);
        rect.setStrokeWidth(5);
        rect.setRotationAxis(Rotate.Y_AXIS);

        Slider slider = new Slider(0, 360, 0);
        rect.rotateProperty().bind(slider.valueProperty());

        StackPane stack = new StackPane(background, rect);
        stack.setPickOnBounds(false);
        VBox vbox = new VBox(stack, slider);
        vbox.setSpacing(50);
        vbox.setAlignment(Pos.CENTER);
        vbox.setMaxWidth(VBox.USE_PREF_SIZE);
        vbox.setMaxHeight(VBox.USE_PREF_SIZE);

        Scene scene = new Scene(new StackPane(vbox), 640, 480, true);
        scene.setCamera(new PerspectiveCamera());
        stage.setScene(scene);
        stage.setTitle("HelloRectangle3D");
        stage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}