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  Why " no capability to remove children()"  (Read 3253 times)
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Offline sinfun

Junior Newbie




Java games rock!


« Posted 2003-05-30 11:33:58 »

public      Scene s = null;
     bjectFile f = new ObjectFile(flags,
       (float)(creaseAngle * Math.PI / 180.0));

      s = f.load(filename);
and when  I want to change the  obj file ,first i use the "objTrans.removeChild(s.getSceneGroup()); "
then the wrong appear: (please help me)

javax.media.j3d.CapabilityNotSetException: Group: no capability to remove children()
     at javax.media.j3d.Group.removeChild(Group.java:349)()
     at ObjLoad.change(ObjLoad.java:257)()
     at ObjLoad.actionPerformed(ObjLoad.java:249)()
     at java.awt.Button.processActionEvent(Button.java:381)()
     at java.awt.Button.processEvent(Button.java:350)()
     at java.awt.Component.dispatchEventImpl(Component.java:3639)()
     at java.awt.Component.dispatchEvent(Component.java:3480)()
     at java.awt.EventQueue.dispatchEvent(EventQueue.java:450)()
     at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:197)()
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)()
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:144)()
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:136)()
     at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)()
Offline Orangy Tang

JGO Kernel


Medals: 56
Projects: 11


Monkey for a head


« Reply #1 - Posted 2003-05-30 11:45:08 »

This is probably pointing out the obvious, but don't you have to set a capability bit in the node to allow removing of children?

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Online kevglass

JGO Kernel


Medals: 172
Projects: 23
Exp: 18 years


Coder, Trainee Pixel Artist, Game Reviewer


« Reply #2 - Posted 2003-05-30 11:45:42 »

The group must have

.setCapability(BranchGroup.ALLOW_CHILDREN_WRITE)

and

.setCapability(BranchGroup.ALLOW_CHILDREN_READ)

The element being removed must be a branch group and have

.setCapability(BranchGroup.ALLOW_DETACH)

called on it.

Kev

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Offline bmyers

Junior Member





« Reply #3 - Posted 2003-05-30 14:46:13 »

Note that you only need to set the capability bits if the BranchGroup is part of a live or compiled scene graph.

Also, if you don't think you'll be doing the remove very often then you might want to set the capabilityIsFrequent(?) to false for that capability, to help Java3D optimize the scene graph.

Offline sinfun

Junior Newbie




Java games rock!


« Reply #4 - Posted 2003-05-31 12:14:53 »

Thanks a lot.I have a lot to learn.....
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