Java8 3D: weird mesh display

Question

Hi all, I have a strange trouble with the TriangleMesh. I've done an example to display what is weird, see below. It displays a mesh which represents bumps. When the camera rotates (or the mesh - same issue), the vertices which are supposed to be back seem to come front!
The bumps are colored the following way: white is front, black is back (white->red->yellow->green->blue->black). Following the white bumps will be ok until the moment where they go backside and the black holes (in the sky) come front.
What is wrong????
public final class Waves3D extends Application {
  * 3D CONSTRUCTION
  private float[] getPoints(final int width, final int height) {
  final float[] points = new float[width * height * 3];
  final int horizontal = (int) Math.round(Math.ceil((double) width / 2));
  final int vertical = (int) Math.round(Math.ceil((double) height / 2));
  int index = 0;
  for (int y = -height / 2; y < vertical; ++y) {
  for (int x = -width / 2; x < horizontal; ++x) {
  points[index] = x;
  points[++index] = y;
  index += 2; // z value is 0
  return points;
  private float[] getTexCoords(final int width, final int height) {
  final float[] coords = new float[width * height * 2];
  final float[] cache = new float[width];
  final int horizontal = width - 1;
  final int vertical = height - 1;
  int index = 0;
  for (int x = 0; x < width; ++x) {
  cache[x] = (float) x / horizontal;
  for (int y = 0; y < height; ++y) {
  final float percent = (float) y / vertical;
  for (int x = 0; x < width; ++x) {
  coords[index++] = cache[x];
  coords[index++] = percent;
  return coords;
  private int[] getFaces(final int width, final int height) {
  final int horizontal = width - 1;
  final int vertical = height - 1;
  final int[] faces = new int[horizontal * vertical * 2 * 3 * 2];
  int point = 0;
  int index = 0;
  for (int y = 0; y < vertical; ++y) {
  for (int x = 0; x < horizontal; ++x) {
  final int right = point + 1;
  final int down = point + width;
  final int downright = down + 1;
  faces[index++] = point;
  faces[index++] = point;
  faces[index++] = down;
  faces[index++] = down;
  faces[index++] = right;
  faces[index++] = right;
  faces[index++] = right;
  faces[index++] = right;
  faces[index++] = down;
  faces[index++] = down;
  faces[index++] = downright;
  faces[index++] = downright;
  ++point;
  ++point;
  return faces;
  private PhongMaterial getMaterial(final int width, final int height) {
  final PhongMaterial material = new PhongMaterial();
  material.setDiffuseMap(new WritableImage(width, height));
  return material;
  * SAMPLE MESH
  private static final NavigableMap<Float, Color> COLORS = new TreeMap<>();
  static {
  COLORS.put(0f, Color.BLACK);
  COLORS.put(30f, Color.BLUE);
  COLORS.put(60f, Color.GREEN);
  COLORS.put(90f, Color.YELLOW);
  COLORS.put(120f, Color.RED);
  COLORS.put(150f, Color.WHITE);
  private Color getColor(final float level) {
  return COLORS.floorEntry(level).getValue();
  private void fillValues(final PhongMaterial material, final float[] points, final int width, final int height) {
  final WritableImage image = (WritableImage) material.getDiffuseMap();
  final PixelWriter writer = image.getPixelWriter();
  int index = 2;
  for (int y = 0; y < height; ++y) {
  for (int x = 0; x < width; ++x) {
  final float z = ((float) (Math.cos(x / 20.) * Math.sin(y / 20.)) + 1) * 90;
  writer.setColor(x, y, getColor(z));
  points[index] = z;
  index += 3;
  * WINDOW AND SCENE SETUP
  private int a, i;
  private void go(final Stage stage, final int width, final int height) {
  final TriangleMesh mesh = new TriangleMesh();
  final MeshView view = new MeshView(mesh);
  final AnchorPane pane = new AnchorPane();
  final Scene scene = new Scene(pane);
  final ParallelCamera camera = new ParallelCamera();
  final PhongMaterial material = getMaterial(width, height);
  final float[] points = getPoints(width, height);
  fillValues(material, points, width, height);
  mesh.getPoints().addAll(points);
  mesh.getTexCoords().addAll(getTexCoords(width, height));
  mesh.getFaces().addAll(getFaces(width, height));
  view.setMouseTransparent(true);
  view.setCullFace(CullFace.NONE);
  view.setMaterial(material);
  AnchorPane.setLeftAnchor(view, 0d);
  AnchorPane.setRightAnchor(view, 0d);
  AnchorPane.setTopAnchor(view, 0d);
  AnchorPane.setBottomAnchor(view, 0d);
  pane.getChildren().addAll(camera, view);
  scene.setCamera(camera);
  stage.setScene(scene);
  stage.show();
  new Thread(() -> {
  try {
  camera.setRotationAxis(new Point3D(1, 1, 0));
  camera.setRotate(50);
  i = 1;
  for (;;) {
  Thread.sleep(50);
  Platform.runLater(() -> {
  a += i;
  if (a >= 80 || a <= -80) {
  i = -i;
  camera.setRotate(a);
  } catch (final InterruptedException e) {
  }).start();
  public void start(final Stage stage) {
  go(stage, 512, 768);
  public static void main(final String... a) {
  launch(a);

Answer 1

The Scene constructor must activate the Z buffer via new Scene(pane,width,height,true); // last argument to true
Please close this issue