Hi,
I'm developing a little simulation, and need collision detection in
this. There are some objects in the scene that will be animated and
they may collide with each other.
During the simulation I have to attach and detach a lot of objects. It
happens some times that I attach an object and place it near to an
other (I have collision) and I remove the object which was there. In
this case I got a null pointer exception:
java.lang.NullPointerException
at
javax.media.j3d.WakeupOnCollisionEntry.getSceneGraphPath(WakeupOnCollisionEntry.java:489)
at
javax.media.j3d.WakeupOnCollisionEntry.setTarget(WakeupOnCollisionEntry.java:376)
at
javax.media.j3d.GeometryStructure.addWakeupOnCollision(GeometryStructure.java:739)
at
javax.media.j3d.WakeupOnCollisionEntry.addBehaviorCondition(WakeupOnCollisionEntry.java:349)
at
javax.media.j3d.WakeupCriterion.buildTree(WakeupCriterion.java:67)
at
javax.media.j3d.BehaviorStructure.activateBehaviors(BehaviorStructure.java:344)
at
javax.media.j3d.BehaviorStructure.processMessages(BehaviorStructure.java:209)
at
javax.media.j3d.StructureUpdateThread.doWork(StructureUpdateThread.java:83)
at javax.media.j3d.J3dThread.run(J3dThread.java:250)
Does anybody know how to solve this problem? Can it be a java3d bug? Is
there a workaround for this?
Help!
Csaba
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