MousePick with Hardware Mouse: Position Error?!

The code should return the name of the object I click with the mouse.

The problem is, the position seems not to be right, because sometimes I click on an object and I get no name and sometimes I click nothing and I get the name of an object.

Hope somebody sees my error! thanks!!!

import com.jme.input.MouseInput;
import com.jme.input.action.InputActionEvent;
import com.jme.input.action.MouseInputAction;
import com.jme.intersection.BoundingPickResults;
import com.jme.intersection.PickResults;
import com.jme.math.Ray;
import com.jme.math.Vector2f;
import com.jme.math.Vector3f;
import com.jme.renderer.Camera;
import com.jme.scene.Node;
import com.jme.scene.Text;
import com.jme.system.DisplaySystem;

 * <code>MousePick</code>
 * @author Mark Powell
 * @version
public class MousePick extends MouseInputAction {

    private Camera camera;
    private Node scene;
    private DisplaySystem display = DisplaySystem.getDisplaySystem();

    public MousePick(Camera camera, Node scene) { = camera;
        this.scene = scene;
    public void performAction(InputActionEvent evt) {
       if (MouseInput.get().isButtonDown(0)) {
         Vector2f screenPos = new Vector2f();
         // Get the position that the mouse is pointing to
         screenPos.set(MouseInput.get().getXAbsolute(), MouseInput.get().getYAbsolute());
         // Get the world location of that X,Y value
         Vector3f worldCoords = display.getWorldCoordinates(screenPos, 1.0f);
         // Create a ray starting from the camera, and going in the direction
            // of the mouse's location
            final Ray mouseRay = new Ray(camera.getLocation(), worldCoords
            PickResults results = new BoundingPickResults();
            if(results.getNumber() > 0) {
                for(int i = 0; i < results.getNumber(); i++) {
                   System.out.println(results.getPickData(i).getTargetMesh().getName() + " " +  results.getPickData(i).getDistance());
                    //if(i != results.getNumber() -1) {
                       //System.out.println("Not Found");

As you're using BoundingPickResults it picks the bounding volume of the objects, so that could explain why you're getting something even though you seemingly click nothing.

Try changing it to TringlePickResults.

Thanks, it seems to work now!

I found the problem!! It seems the height axis is mirrored.

Sphere is in the upper half of the screen, I can click it on the other screen side

Which value do I have to change?

i didn't do anything jme related in some time, but i think the awt and lwjgl mouse systems have different coordinate systems.

Yes, you are right!

To solve the problem I have to get the awt coordinates and calculating them minus lwjgl coordinates. Tricky!