I have a live scene as follows: BG1 -> BG2 -> Switch and I have a SharedGroup defined.
I detach BG2 from BG1: BG2.detach(); and then I add a Link to the Switch: Switch.addChild(aLink); and then reattach BG2 to BG1: BG1.addChild(BG2); I get the following error on the "BG1.addChild(BG2);" code: java.lang.NullPointerException at javax.media.j3d.SwitchRetained.traverseSwitchChild(SwitchRetained.java:548) at javax.media.j3d.SwitchRetained.setLive(SwitchRetained.java:379) at javax.media.j3d.GroupRetained.childDoSetLive(GroupRetained.java:2077) at javax.media.j3d.GroupRetained.doSetLive(GroupRetained.java:2126) at javax.media.j3d.BranchGroupRetained.setLive(BranchGroupRetained.java:161) at javax.media.j3d.BranchGroupRetained.childCheckSetLive(BranchGroupRetained.ja va:225) at javax.media.j3d.GroupRetained.checkSetLive(GroupRetained.java:1481) at javax.media.j3d.GroupRetained.checkSetLive(GroupRetained.java:1418) at javax.media.j3d.GroupRetained.doAddChild(GroupRetained.java:481) at javax.media.j3d.GroupRetained.addChild(GroupRetained.java:454) at javax.media.j3d.Group.addChild(Group.java:266) at nch7.ToolFrame.IO_processChildren(ToolFrame.java:1612) <----my code at SGO.SGO_BranchGroup.readFrom(SGO_BranchGroup.java:194) : at nch7.ToolFrame.IO_processChildren(ToolFrame.java:1614) : at SGO.SGO_Switch.readFrom(SGO_Switch.java:246) at nch7.ToolFrame.IO_processChildren(ToolFrame.java:1614) : : : (cut for brevity) This error does not occur if I add a BranchGroup, or TransformGroup or Shape3d instead of the Link. However, it does occur if I have BG1 -> BG2 -> Switch -> BG3 and I try to add the Link to the BG3. java.lang.NullPointerException at javax.media.j3d.SwitchRetained.traverseSwitchChild(SwitchRetained.java:548) at javax.media.j3d.SwitchRetained.setLive(SwitchRetained.java:379) at javax.media.j3d.GroupRetained.childDoSetLive(GroupRetained.java:2077) at javax.media.j3d.GroupRetained.doSetLive(GroupRetained.java:2126) at javax.media.j3d.BranchGroupRetained.setLive(BranchGroupRetained.java:161) at javax.media.j3d.BranchGroupRetained.childCheckSetLive(BranchGroupRetained.ja va:225) at javax.media.j3d.GroupRetained.checkSetLive(GroupRetained.java:1481) at javax.media.j3d.GroupRetained.checkSetLive(GroupRetained.java:1418) at javax.media.j3d.GroupRetained.doAddChild(GroupRetained.java:481) at javax.media.j3d.GroupRetained.addChild(GroupRetained.java:454) at javax.media.j3d.Group.addChild(Group.java:266) at nch7.ToolFrame.IO_processChildren(ToolFrame.java:1612) at SGO.SGO_BranchGroup.readFrom(SGO_BranchGroup.java:194) at nch7.ToolFrame.IO_processChildren(ToolFrame.java:1614) Is this a bug? Cheers, Bob Gray =========================================================================== To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff JAVA3D-INTEREST". For general help, send email to [EMAIL PROTECTED] and include in the body of the message "help".
