MousePick example :?

Hello everyone. I'm new to JMonkey.

So, currently i'm studying HelloMousePick example.

In example everything works fine, but after copy&paste it brakes into dust.

Here's the code:

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;

import org.apache.log4j.Logger;
import org.interspace.datamodel.generator.DefaultGalaxyGenerator;
import org.interspace.datamodel.stellar.Galaxy;
import org.interspace.datamodel.stellar.StarSystem;
import org.interspace.gui.shape.OrtedShape;
import org.interspace.gui.shape.StarConnection;
import org.interspace.gui.shape.OrtedShape.OrtType;

import com.jme.bounding.BoundingBox;
import com.jme.image.Texture;
import com.jme.input.AbsoluteMouse;
import com.jme.input.FirstPersonHandler;
import com.jme.input.KeyBindingManager;
import com.jme.input.KeyInput;
import com.jme.input.MouseInput;
import com.jme.intersection.BoundingPickResults;
import com.jme.intersection.PickResults;
import com.jme.intersection.TrianglePickResults;
import com.jme.math.Ray;
import com.jme.math.Vector2f;
import com.jme.math.Vector3f;
import com.jme.renderer.ColorRGBA;
import com.jme.renderer.Renderer;
import com.jme.scene.Line;
import com.jme.scene.Node;
import com.jme.scene.Spatial.LightCombineMode;
import com.jme.scene.shape.Box;
import com.jme.scene.shape.Sphere;
import com.jme.util.geom.Debugger;

public class GuiContext extends AbstractGuiContext {
   private static Logger logger = Logger.getLogger(GuiContext.class);
   private static GuiContext instance;
   private boolean drawOrts;
   private boolean drawGrid;
   private AbsoluteMouse am;
   PickResults pr;
   public static GuiContext getInstance() {
      if (instance == null) {
         instance = new GuiContext();
      return GuiContext.instance;

     * Called every frame to update scene information.
     * @param interpolation
     *            unused in this implementation
     * @see BaseSimpleGame#update(float interpolation)
    protected final void update(float interpolation) {

        if ( !pause ) {
            /** Call simpleUpdate in any derived classes of SimpleGame. */

            /** Update controllers/render states/transforms/bounds for rootNode. */
            rootNode.updateGeometricState(tpf, true);
            statNode.updateGeometricState(tpf, true);

     * This is called every frame in BaseGame.start(), after update()
     * @param interpolation
     *            unused in this implementation
     * @see AbstractGame#render(float interpolation)
    protected final void render(float interpolation) {
        Renderer r = display.getRenderer();

        /** Draw the rootNode and all its children. */
        /** Call simpleRender() in any derived classes. */
        /** Draw the stats node to show our stat charts. */

    protected void doDebug(Renderer r) {

        if (showDepth) {
            Debugger.drawBuffer(Texture.RenderToTextureType.Depth, Debugger.NORTHEAST, r);

   protected void simpleInitGame() {
      // Create a new mouse. Restrict its movements to the display screen.
      am = new AbsoluteMouse("The Mouse", display.getWidth(), display
      // Get the mouse input device and assign it to the AbsoluteMouse
      // Move the mouse to the middle of the screen to start with
      am.setLocalTranslation(new Vector3f(display.getWidth() / 2, display
            .getHeight() / 2, 0));
      // Assign the mouse to an input handler
      // Create the box in the middle. Give it a bounds
      // Remove all the lightstates so we can see the per-vertex colors
      pr = new BoundingPickResults();
      ((FirstPersonHandler) input).getMouseLookHandler().setEnabled(false);

      DefaultGalaxyGenerator generator = new DefaultGalaxyGenerator(20, 20, 20);
      Galaxy galaxy = generator.generate();
   private void addStarSystemsToScene(Galaxy galaxy) {
      Node galaxyNode = new Node("GalaxyNode");
      Iterator<StarSystem> it = galaxy.getSystems().iterator();
      while(it.hasNext()) {
         Sphere sphere = new Sphere("sphere", 30, 30, 0.25f);
         StarSystem system =;
         sphere.updateGeometry(new Vector3f(system.getX(), system.getY(), system.getZ()), sphere.getZSamples(), sphere.getRadialSamples(), sphere.getRadius());
//         OrtedShape shape = new OrtedShape(sphere, sphere.getCenter(), OrtType.XZ_ORT);
//         shape.updateModelBound();
//         shape.setLightCombineMode(LightCombineMode.Off);
//         galaxyNode.attachChild(shape);
   private void addXZGrid() {
      ColorRGBA[] color = new ColorRGBA[2];
      color[0] = new ColorRGBA(1f, 1f, 0, 1f);
      color[1] = new ColorRGBA(1f, 1f, 0, 1f);
      for (int i = 0; i < 101; i++) {
         Vector3f[] v1 = new Vector3f[2];
         v1[0] = new Vector3f(i, 0, 0);
         v1[1] = new Vector3f(i, 0, 100);
         Line l1 = new Line("Line1", v1, null, color, null);
      for (int i = 0; i < 101; i++) {
         Vector3f[] v1 = new Vector3f[2];
         v1[0] = new Vector3f(0, 0, i);
         v1[1] = new Vector3f(100, 0, i);
         Line l1 = new Line("Line1", v1, null, color, null);
   public void registerKeyBindings() {
      //Toggle orts
      KeyBindingManager.getKeyBindingManager().set( KeyBinderCommandConstants.TOGGLE_ORTS,
                KeyInput.KEY_O );
      //Draw grid
      KeyBindingManager.getKeyBindingManager().set( KeyBinderCommandConstants.TOGGLE_GRID,
                KeyInput.KEY_O );
   public void checkKeyBindings() {
      /** If toggle_orts is a valid command (via key o), shows orts. */
        if ( KeyBindingManager.getKeyBindingManager().isValidCommand(
                KeyBinderCommandConstants.TOGGLE_GRID, false ) ) {
            drawGrid = !drawGrid;
        if ( KeyBindingManager.getKeyBindingManager().isValidCommand(
                KeyBinderCommandConstants.TOGGLE_ORTS, false ) ) {
            drawOrts = !drawOrts;
      if (MouseInput.get().isButtonDown(0)) {
        //releases mouse
        //((FirstPersonHandler) input).getMouseLookHandler().setEnabled(false);
   private void pickObject() {
      Vector2f screenPos = new Vector2f();
      // Get the position that the mouse is pointing to
      screenPos.set(am.getHotSpotPosition().x, am.getHotSpotPosition().y);
      // Get the world location of that X,Y value
      Vector3f worldCoords = display.getWorldCoordinates(screenPos, 0);
      Vector3f worldCoords2 = display.getWorldCoordinates(screenPos, 1);
      // Create a ray starting from the camera, and going in the direction
      // of the mouse's location
      Ray mouseRay = new Ray(worldCoords, worldCoords2.subtractLocal(worldCoords).normalizeLocal());
      rootNode.findPick(mouseRay, pr);
      for (int i = 0; i < pr.getNumber(); i++) {

   public void setDrawOrts(boolean drawOrts) {
      this.drawOrts = drawOrts;

   public boolean isDrawOrts() {
      return drawOrts;

AbstractGuiContext is copy&paste BaseSimpleGame

What I did wrong?

It's tough to tell what's wrong without any idea of the errors you're having but at a quick glance, I see that you're using Apache's logger rather than the Java implementation that jME uses internally (Shouldn't cause a problem)…

Sorry, you are right sbook.

I have no errors. Absolutely no errors.

This code places spheres in ransom 3d location.

According to HelloMousePick after "clicking on them", this spheres should get random colors.

But they are not. PickResults returns some meshes, but spheres are still white colored.

I think your problem is in your lighting… I don't see any lightState in your renderstate

mhelz0001 said:

I think your problem is in your lighting.... I don't see any lightState in your renderstate

Yup, all objects white and no shades means no light.