Java3D and Behaviours : KeyNavigatorBehaviour works fine, but not MouseRotate - java-3d

Question

I don't manage to give user mouse interaction to a ColorCube by using a MouseRotate. However, when i use a KeyNavigatorBehaviour, i can control the cube with keyboard as needed.
Here the code i used to test MouseRotate :
import javax.media.j3d.BoundingSphere;
import javax.media.j3d.BranchGroup;
import javax.media.j3d.GraphicsConfigTemplate3D;
import javax.media.j3d.TransformGroup;
import javax.swing.JFrame;
import javax.vecmath.Point3d;
import com.sun.j3d.exp.swing.JCanvas3D;
import com.sun.j3d.utils.behaviors.mouse.MouseRotate;
import com.sun.j3d.utils.geometry.ColorCube;
import com.sun.j3d.utils.universe.SimpleUniverse;
public class MovingAroundCube extends JFrame {
private static final long serialVersionUID = 1L;
public MovingAroundCube(){
setTitle("Moving around cube");
setSize(300,300);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationRelativeTo(null);
JCanvas3D jCanvas3D = new JCanvas3D(new GraphicsConfigTemplate3D());
jCanvas3D.setSize(300, 300);
add(jCanvas3D);
SimpleUniverse universe = new SimpleUniverse(jCanvas3D.getOffscreenCanvas3D());
universe.getViewingPlatform().setNominalViewingTransform();
universe.addBranchGraph(createSceneGraph());
}
public BranchGroup createSceneGraph() {
BranchGroup objRoot = new BranchGroup();
TransformGroup listenerGroup = new TransformGroup();
listenerGroup.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
listenerGroup.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
objRoot.addChild(listenerGroup);
//KeyNavigatorBehavior behaviour = new KeyNavigatorBehavior(listenerGroup);
MouseRotate behaviour = new MouseRotate(listenerGroup);
behaviour.setSchedulingBounds(new BoundingSphere(new Point3d(), 100));
listenerGroup.addChild(behaviour);
listenerGroup.addChild(new ColorCube(0.4));
return objRoot;
}
public static void main(String[] args) {
new MovingAroundCube().setVisible(true);
}
}
If I uncomment the line creating the KeyNavigatorBehaviour and comment the line creating the MouseRotate, user interaction this time is possible .
So, why can't the cube react to the mouse (when i use MouseRotate behaviour instance) ?
Any help will be appreciated.
System : Xubuntu 11.04
Java3D version : 1.5.2

Answer 1

There are two ways to solve this dilemma:
Use this constructor:
MouseRotate behaviour = new MouseRotate(jCanvas3D, listenerGroup);
or
Enable mouse events as long as no MouseListeners are added:
import java.awt.AWTEvent;
JCanvas3D jCanvas3D = new JCanvas3D(new GraphicsConfigTemplate3D()) {
{
this.enableEvents(AWTEvent.MOUSE_EVENT_MASK |
AWTEvent.MOUSE_MOTION_EVENT_MASK |
AWTEvent.MOUSE_WHEEL_EVENT_MASK);
}
};
Key events are enabled because 'setFocusable(true)' is set in JCanvas3D.
August, InteractiveMesh