Hi, I have some java code attached that uses the javaFX library to generate a blue sphere and rotate it. However it executes successfully but does not produce the actual sphere. Can you tell what the mistake is? Any help appreciated.

Hey! Welcome to the Ranch, but we'd need to see the code you're using to have a chance determining what might be wrong.

Otherwise we're just guessing, like this: If you're doing something 3D, a lot of times you've just got the view frustum pointed in the wrong direction, and you need to play around with locations/sizes.

I had attached the Main.java code with the post. Didn't you see the attachment? Here is a link: https://justpaste.it/6z9lh

I added to the start() method (to the end) this and a window was shown: stage.setScene(scene); stage.show();But I do not see the sphere.

No the original attachment isn't visible.

I guess you want something like this?

import javafx.animation.Animation; import javafx.animation.RotateTransition; import javafx.application.Application; import javafx.scene.*; import javafx.scene.paint.Color; import javafx.scene.paint.PhongMaterial; import javafx.scene.shape.Sphere; import javafx.scene.transform.Rotate; import javafx.stage.Stage; import javafx.util.Duration; public class Main extends Application {        @Override    public void start(Stage stage) {        Sphere sphere = new Sphere(100);        sphere.setMaterial(new PhongMaterial(Color.BLUE));                PointLight pointLight = new PointLight(Color.WHITE);        pointLight.setTranslateX(-200);        pointLight.setTranslateY(-100);        pointLight.setTranslateZ(-300);                AmbientLight ambientLight = new AmbientLight(Color.color(0.3, 0.3, 0.3));                Group root = new Group(sphere, pointLight, ambientLight);                Scene scene = new Scene(root, 500, 400, true);        scene.setFill(Color.rgb(30, 30, 30));                PerspectiveCamera camera = new PerspectiveCamera(true);        camera.setNearClip(1);        camera.setFarClip(2000);        camera.setTranslateZ(-500);        scene.setCamera(camera);                RotateTransition rotation = new RotateTransition(Duration.seconds(5), sphere);        rotation.setAxis(Rotate.Y_AXIS);        rotation.setByAngle(360);        rotation.setCycleCount(Animation.INDEFINITE);        rotation.play();                stage.setTitle("Blue Sphere");        stage.setScene(scene);        stage.show();    }        public static void main(String[] args) {        launch(args);    } }

This is the original code:

Main.javaimport javafx.animation.RotateTransition; import javafx.util.Duration; import javafx.scene.transform.Rotate; import javafx.application.Application; import javafx.scene.PerspectiveCamera; import javafx.scene.Scene; import javafx.scene.layout.StackPane; import javafx.scene.paint.Color; import javafx.scene.shape.DrawMode; import javafx.scene.shape.Sphere; import javafx.stage.Stage; public class Main extends Application {    public static void main(String[] args) {        launch(args);    }    @Override    public void start(Stage stage) {        double diameterMeters = 1.0;        double radius = diameterMeters / 2.0;        Sphere sphere = new Sphere(radius * 100);        sphere.setDrawMode(DrawMode.FILL);        sphere.setMaterial(new javafx.scene.paint.PhongMaterial(Color.BLUE));        // Add a point light        javafx.scene.PointLight light = new javafx.scene.PointLight(Color.WHITE);        light.setTranslateX(200);        light.setTranslateY(-100);        light.setTranslateZ(-200);        // Add ambient light for softer illumination        javafx.scene.AmbientLight ambient = new javafx.scene.AmbientLight(Color.WHITE);        StackPane root = new StackPane(sphere, light, ambient);        Scene scene = new Scene(root, 500, 400, true);        // Move the camera back so the sphere is in view        PerspectiveCamera camera = new PerspectiveCamera(true);        camera.setTranslateZ(-500);        scene.setCamera(camera);        // Add rotation animation        RotateTransition rt = new RotateTransition(Duration.seconds(5), sphere);        rt.setAxis(Rotate.Y_AXIS);    } }