Hi,
I have a class which inherits from Shape3D and uses a Behavior which
implements GeometryUpdater to modify its referenced Geometry during
runtime. That works very well when I use one separate instance of this
object. When I try to add more of these special Shape3Ds I want that their
geometry is modified synchronously so I use Shape3D.cloneTree(false) to
get an other Shape3D-object referencing the same geometry data.
Here is my first problem: After the first Shape3D was already added to the
scene I get a MultipleParentException when I try to add the second, cloned
one. Thats not really clear for me because the cloned copy shouldn't be
already part of the scene?
As a workaround I did the following: I used the first instance of the
Shape3D as original only to create copies out of it. Using this way of
course first I had to add this Shape3Ds Behavior to the universe so that
the modification of the geometry could take place. And here following
exception occurs when I add the Behavior of the original Shape3D and
afterwards add the copy of the Shape3D itself to the scene:
java.lang.NullPointerException
at java.lang.System.arraycopy(Native Method)
at
javax.media.j3d.GeometryArrayRetained.unIndexifyJavaArray(GeometryArrayRetained.java:2976)
at
javax.media.j3d.GeometryArrayRetained.unIndexify(GeometryArrayRetained.java:2780)
at
javax.media.j3d.IndexedGeometryArrayRetained.cloneNonIndexedGeometry(IndexedGeometryArrayRetained.java:100)
at
javax.media.j3d.GeometryArrayRetained.initMirrorGeometry(GeometryArrayRetained.java:10079)
at
javax.media.j3d.RenderingAttributesStructure.updateObject(RenderingAttributesStructure.java:181)
at
javax.media.j3d.MasterControl.updateMirrorObjects(MasterControl.java:2734)
at javax.media.j3d.MasterControl.runMonitor(MasterControl.java:3432)
at javax.media.j3d.MasterControl.doWork(MasterControl.java:2991)
at javax.media.j3d.MasterControlThread.run(MasterControlThread.java:28)
So what alternatives do I have when I want to add several identically
Shape3Ds whith synchronously modified geometry data when I can't use
SharedGroups either?
Michael
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