JavaFX 3D - Change sphere color and adding lights

Main.java

package sample;

import javafx.application.Application;
import javafx.scene.*;
import javafx.scene.input.KeyEvent;
import javafx.scene.paint.Color;
import javafx.scene.paint.PhongMaterial;
import javafx.scene.shape.Sphere;
import javafx.scene.transform.Translate;
import javafx.stage.Stage;


public class Main extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception{

        Sphere sphere = new Sphere(100);

        PhongMaterial material = new PhongMaterial();
        material.setDiffuseColor(Color.valueOf("#9567fe"));

        sphere.setMaterial(material);

        Group group = new Group();
        group.getChildren().add(sphere);

        group.getChildren().addAll(lights());


        Scene scene = new Scene(group,1000,800);
        scene.setCamera(new PerspectiveCamera());
        scene.setFill(Color.SILVER);

        sphere.translateXProperty().set(500);
        sphere.translateYProperty().set(400);

        primaryStage.addEventHandler(KeyEvent.KEY_PRESSED, e ->{
            switch (e.getCode()) {
                case W -> {
                    sphere.translateZProperty().set(sphere.getTranslateZ() + 10);
                    System.out.println(sphere.getTranslateZ());
                }
                case S -> {
                    sphere.translateZProperty().set(sphere.getTranslateZ() - 10);
                    System.out.println(sphere.getTranslateZ());
                }
            }
        });

        primaryStage.setTitle("3D World");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    private Node[] lights() {
        PointLight pointLight1 = new PointLight();
        PointLight pointLight2 = new PointLight();

        pointLight2.getTransforms().add(new Translate(1000,0,0));

        return new Node[] {pointLight1, pointLight2};
    }

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