RWGRAY wrote:
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?
Yes, please send us a test program to investigate.
Thanks for your bug report.
- Kelvin
------------
Java 3D Team
Sun Microsystems Inc.
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