Yes, OrderedGroup is broken. I submitted hte following program to the
discussion group once earlier and didn't get a response so I'm sending it
again and I also have sent it directly to the 'Java 3D beta program'. I
think that the bug was initially reported much earlier by someone else and
that the Java3D team said that it will be fixed in the upcoming v. 1.2.1.
I apologize if this bug has already been reported. Just in case it hasn't,
I'm providing a test program to illustrate it. In this program an
OrderedGroup generates an IndexOutOfBoundsException when a grandchild is
detached and then replaced. The exception doesn't seem to occur in the case
of a child -- at least not in my tests.
/*******OrderedGroupBug.java********/
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import com.sun.j3d.utils.applet.*;
import com.sun.j3d.utils.geometry.*;
import com.sun.j3d.utils.universe.*;
import javax.media.j3d.*;
public class OrderedGroupBug extends Applet{
public OrderedGroupBug(){
setLayout(new BorderLayout());
Canvas3D c = new Canvas3D(
SimpleUniverse.getPreferredConfiguration() );
add( "Center", c );
final Scene scene = new Scene();
SimpleUniverse u = new SimpleUniverse( c );
u.getViewingPlatform().setNominalViewingTransform();
u.addBranchGraph( scene );
Button b1 = new Button( "Toggle Child" );
b1.addActionListener( new ActionListener(){
public void actionPerformed( ActionEvent e ){
scene.toggleChild();
}
});
add( "North", b1 );
Button b2 = new Button( "Toggle Grandchild" );
b2.addActionListener( new ActionListener(){
public void actionPerformed( ActionEvent e ){
scene.toggleGrandchild();
}
});
add( "South", b2 );
}
public static void main( String[] args ){
new MainFrame( new OrderedGroupBug(), 256, 256 );
}
class Scene extends BranchGroup{
OrderedGroup OG = new OrderedGroup();{
OG.setCapability( Group.ALLOW_CHILDREN_WRITE );
OG.setCapability( Group.ALLOW_CHILDREN_EXTEND );
}
BranchGroup BG1 = new BranchGroup();{
BG1.setCapability( BranchGroup.ALLOW_DETACH );
BG1.setCapability( Group.ALLOW_CHILDREN_WRITE );
BG1.setCapability( Group.ALLOW_CHILDREN_EXTEND );
}
BranchGroup BG2 = new BranchGroup();{
BG2.setCapability( BranchGroup.ALLOW_DETACH );
}
public Scene(){
super();
addChild( OG );
OG.addChild( BG1 );
BG1.addChild( BG2 );
BG2.addChild( new ColorCube( 0.2f ));
}
public void toggleChild(){
if( BG1.isLive() ){
BG1.detach();
}else{
OG.addChild( BG1 );
}
}
public void toggleGrandchild(){
if( BG2.isLive() ){
BG2.detach();
}else{
BG1.addChild( BG2 );
}
}
}
}
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