I think I have uncovered a bug regarding Switch with a child SharedGroup.
Here is a test program. Setting boolean willCrash = true generates the
following Exception.
java.lang.NullPointerException
at
javax.media.j3d.ContainsNodesList.getContainsNodes(ContainsNodesList.java:28
)
at
javax.media.j3d.Shape3DRetained.setLive(Shape3DRetained.java:1092)
at javax.media.j3d.GroupRetained.doSetLive(GroupRetained.java:1475)
at javax.media.j3d.GroupRetained.setLive(GroupRetained.java:1209)
at
javax.media.j3d.SharedGroupRetained.setLive(SharedGroupRetained.java:108)
at javax.media.j3d.LinkRetained.setLive(LinkRetained.java:140)
at javax.media.j3d.GroupRetained.doSetLive(GroupRetained.java:1475)
at javax.media.j3d.SwitchRetained.setLive(SwitchRetained.java:370)
at javax.media.j3d.GroupRetained.doSetLive(GroupRetained.java:1475)
at
javax.media.j3d.TransformGroupRetained.setLive(TransformGroupRetained.java:3
22)
at javax.media.j3d.GroupRetained.doSetLive(GroupRetained.java:1475)
at
javax.media.j3d.BranchGroupRetained.setLive(BranchGroupRetained.java:101)
at javax.media.j3d.Locale.doAddBranchGraph(Locale.java:183)
at javax.media.j3d.Locale.addBranchGraph(Locale.java:159)
at
com.sun.j3d.utils.universe.SimpleUniverse.addBranchGraph(SimpleUniverse.java
:235)
at TestSwitch.<init>(TestSwitch.java:49)
at TestSwitch.main(TestSwitch.java:62)
Raffi
/************************TestSwitch.java****************************/
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.geometry.*;
import com.sun.j3d.utils.universe.*;
import javax.media.j3d.*;
import javax.vecmath.*;
public class TestSwitch extends Applet{
boolean willCrash = true;
Switch switchG;
public BranchGroup createScene(){
BranchGroup root = new BranchGroup();
TransformGroup TG1 = new TransformGroup();
TransformGroup TG2 = new TransformGroup();
Transform3D T = new Transform3D();
switchG = new Switch();
switchG.setCapability( Switch.ALLOW_SWITCH_READ );
switchG.setCapability( Switch.ALLOW_SWITCH_WRITE );
SharedGroup cube = new SharedGroup();
cube.addChild( new ColorCube(0.1) );
T.set( new Vector3d( -0.5, 0, 0 ) );
TG1.setTransform( T );
TG1.addChild( new Link( cube ) );
T.set( new Vector3d( 0.5, 0, 0 ) );
TG2.setTransform( T );
TG2.addChild( switchG );
switchG.addChild( new Link( cube ) );
if( willCrash ){
root.addChild( TG1 );
root.addChild( TG2 );
}else{
root.addChild( TG2 );
root.addChild( TG1 );
}
return root;
}
public TestSwitch() {
GraphicsConfiguration config =
SimpleUniverse.getPreferredConfiguration();
Canvas3D canvas = new Canvas3D(config);
SimpleUniverse universe = new SimpleUniverse(canvas);
universe.getViewingPlatform().setNominalViewingTransform();
universe.addBranchGraph( createScene() );
setLayout(new BorderLayout());
add("Center", canvas);
Button switcher = new Button( "Switch" );
switcher.addActionListener( new ActionListener(){
public void actionPerformed( ActionEvent e ){
switchShape();
}
});
add( "South", switcher );
}
public static void main( String[] arg ){
new MainFrame(new TestSwitch(), 256, 256);
}
public void switchShape(){
int mask = switchG.getWhichChild() == Switch.CHILD_ALL ?
Switch.CHILD_NONE : Switch.CHILD_ALL;
switchG.setWhichChild( mask );
}
}
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