Samuel,
Have you tried doing the detach in a j3d Behavior ?
There is a known MT bug with detach() executed in the user thread.
- Chien Yang
Java 3D, Sun Microsystems Inc.
Liu Samuel wrote:
> hi all,
> There is a NullPointerException occured when I attempted to detach a BranchGroup
> from the locale, there is a collision detection behavior serves as a child of the
> BranchGroup. The call trace is:
>
> java.lang.NullPointerException
> at
> javax.media.j3d.TransformGroupRetained.getCurrentChildLocalToVworld(TransformGroupRetained.java:1029)
> at
> javax.media.j3d.TransformGroupRetained.getCurrentChildLocalToVworld(TransformGroupRetained.java:1025)
> at
> javax.media.j3d.TransformGroupRetained.transformBounds(TransformGroupRetained.java:1000)
> at
> javax.media.j3d.WakeupOnCollisionEntry.updateCollisionBounds(WakeupOnCollisionEntry.java:410)
> at
> javax.media.j3d.GeometryStructure.processCollisionDetection(GeometryStructure.java:866)
> at
> javax.media.j3d.GeometryStructure.processMessages(GeometryStructure.java:214)
> at javax.media.j3d.StructureUpdateThread.doWork(StructureUpdateThread.java:83)
> at javax.media.j3d.J3dThread.run(J3dThread.java:250)
>
> Seems to be an internel exception. Why? Bug of j3d collision detection? Any
> walkarounds?
>
> Many many many thanks for your help:-)
>
> Liu
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