[JAVA3D] Problems with Behavior

[Matt Holland]

I'm having some trouble with a very simple app: I have a couple of shapes on the screen and need to change the colour of one of them by clicking on it with the mouse. Unfortunately I keep getting a CapabilityNotSetException:

 

Exception occurred during Behavior execution:

javax.media.j3d.CapabilityNotSetException: Shape3D: no capability to get appearance

    at javax.media.j3d.Shape3D.getAppearance(Shape3D.java:430)

    at ids.java3d.HatColourBehavior.updateScene(HatColourBehavior.java:55)

    at com.sun.j3d.utils.picking.behaviors.PickMouseBehavior.processStimulus(PickMouseBehavior.java:153)

    at javax.media.j3d.BehaviorScheduler.doWork(BehaviorScheduler.java:167)

    at javax.media.j3d.J3dThread.run(J3dThread.java:256)

 

The failure occurs when trying to execite the getAppearance() method. The thing is, as far as I know, I *have* set the capability. The code I'm using to create the object is:

 

MagicHat hat = new MagicHat();
hat.setPickable(true);
hat.setCapability(Node.ENABLE_PICK_REPORTING);
hat.setCapability(Shape3D.ALLOW_APPEARANCE_WRITE);
hat.setCapability(Shape3D.ALLOW_APPEARANCE_READ);

 

I even went into the MagicHat class (which extends Shape3D and consists of two Cylinders) and set ENABLE_APPEARANCE_MODIFY on the two Cylinders.

 

Any ideas what I'm doing wrong? Am I missing something really obvious?

 

Thanks,

Matt