Java SE (Java Platform, Standard Edition)

Hi everybody,

I would like to rotate a loaded model (or the "camera"), which is shown in the middle of the screen.

How can I do that? The object should be rotating all the time very slowly (like one 360 degress rotating in 10sec).

public class CrossingFrame3D extends Applet {

    private BranchGroup scene;
    private SimpleUniverse u;
    private Background background;

    public CrossingFrame3D() throws Exception {
        setLayout(new BorderLayout());
        Canvas3D canvas = createCanvas();
        add("Center", canvas);
        u = new SimpleUniverse(canvas);

        scene = createContent();

        TransformGroup vtg = u.getViewingPlatform().getViewPlatformTransform();
        Transform3D moveback = new Transform3D();
        moveback.setTranslation(new Vector3f(0.0f, 0.0f, 10.0f));
        vtg.setTransform(moveback);

        BufferedImage image = ImageIO.read(new File("test.jpg"));
        BufferedImage resizedImage = new BufferedImage(640, 480, image.getType());
        Graphics2D g = resizedImage.createGraphics();
        g.drawImage(image, 0, 0, 640, 480, null);
        g.dispose();
        BoundingSphere boundingSphere = new BoundingSphere(new Point3d(0.0, 0.0, 0.0), 100.0);
        TextureLoader backgroundTexture = new TextureLoader(resizedImage, this);
        background = new Background(backgroundTexture.getImage());
        background.setApplicationBounds(boundingSphere);
        background.setCapability(Background.ALLOW_IMAGE_WRITE);
        scene.addChild(background);

        scene.compile();
        u.getViewer().getView().setBackClipDistance(10000.0);
        u.addBranchGraph(scene);
    }

    private Canvas3D createCanvas() {
        GraphicsConfigTemplate3D template = new GraphicsConfigTemplate3D();
        GraphicsConfiguration gc1 = GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice().getBestConfiguration(template);
        return new Canvas3D(gc1);
    }

    private BranchGroup createContent() throws Exception {
        Loader loader = new ObjectFile(ObjectFile.LOAD_ALL);

        // Use these 4 lines to load from a local file
        java.io.File file = new java.io.File("cow.obj");
        if (file.getParent() != null) {
            if (file.getParent().length() > 0) {
                loader.setBasePath(file.getParent() + java.io.File.separator);
            }
        }
        Scene newScene = loader.load(file.getName());

        BranchGroup group = newScene.getSceneGroup();
        createLights(group);
        return group;
    }

    private void createLights(BranchGroup graphRoot) {
        // Create a bounds for the light source influence
        BoundingSphere bounds = new BoundingSphere(new Point3d(0.0, 0.0, 0.0), 100.0);

        // Set up the global, ambient light
        Color3f alColor = new Color3f(0.3f, 1.0f, 0.3f);
        AmbientLight aLgt = new AmbientLight(alColor);
        aLgt.setInfluencingBounds(bounds);
        graphRoot.addChild(aLgt);

        // Set up the point (infinite) light source
        Point3f location = new Point3f(0.0f, 0.0f, 100.0f);
        PointLight lgt1 = new PointLight(new Color3f(1.0f, 1.0f, 1.0f),
                location,
                new Point3f(1.0f, 0.0f, 0.0f));
        lgt1.setInfluencingBounds(bounds);
        graphRoot.addChild(lgt1);

        // Set up the point (infinite) light source
        Point3f location2 = new Point3f(0.0f, 0.0f, -100.0f);
        PointLight lgt2 = new PointLight(new Color3f(1.0f, 1.0f, 1.0f),
                location2,
                new Point3f(-1.0f, 0.0f, 0.0f));
        lgt2.setInfluencingBounds(bounds);
        graphRoot.addChild(lgt2);
    }

    public void updateFrame(String img, Barcode barcode) throws IOException {

        if (barcode != null) {
            //change of model
            switch (barcode.getValue()) {
                case COW:
                    break;
                case CAR:
                    break;
                case ROBOT:
                    break;
                default:
                    throw new IllegalArgumentException("BarcodeType is not a known type!");
            }
        }

        BufferedImage image = ImageIO.read(new File(img));
        BufferedImage resizedImage = new BufferedImage(640, 480, image.getType());
        Graphics2D g = resizedImage.createGraphics();
        g.drawImage(image, 0, 0, 640, 480, null);
        g.dispose();
        TextureLoader backgroundTexture = new TextureLoader(resizedImage, this);
        background.setImage(backgroundTexture.getImage());
    }
}