Just wanted to say cheers for the advice, it sorted a
lot out!
I'll soon have a piece of code that works correctly, i
think?
Thanks again!
KP
--- Katja Loescher <[EMAIL PROTECTED]> wrote: > Hi
Karl,
>
> I am not quite sure what the reason for your error
> is, but there is an
> example program in
> ...\demo\java3d\AWT_Interaction\AWTInteraction.java
> ( in the
> Java directory). It rotates a cube in response to
> clicking a button.
>
> An easier way (so I think) is just to implement an
> ActionListener:
>
> public class programname implements ActionListener {
> public BranchGroup scene;
> ....
> public void actionPerformed( ActionEvent e ) {
> if ( e.getSource()==Button_newCube ) {
>
> //create BranchGroup for the new objekt
> BranchGroup new_BranchGroup = new BranchGroup();
> //create TransformGroup for the new object
> TransformGroup new_objTrans = new TransformGroup();
> Box myCube = new Box();
>
> //connect everything and add to the scene
> new_BranchGroup.addChild( new_objTrans );
> new_objTrans.setTransform( transTemp );
> new_objTrans.addChild( myCube );
> scene.addChild( new_BranchGroup );
> }
> }
> }
>
> I hope this helps. If you need more information you
> can also check out
> chapter 4 of the J3D tutorial.
>
> Katja
>
> > Hi again,
> > Non stop questions from the one they call KP!
> >
> > Anyway, I want to be able to let the user decide
> how
> > many objects are to be placed in the scene, I want
> the
> > user to be able to place an object by clicking a
> > button..They can click as many times as they like
> and
> > a new object will be placed in the scene, I'm not
> too
> > worried where the object is placed as the user can
> > move each object to where they would like it to
> be.
> >
> > At the moment I have my objects, I have my button,
> but
> > I can't get them to work together. I'm using
> > behaviors, but I not sure I should be?
> > I can compile my code but I get the following
> error
> > when I click my addObject button:
> >
> > Exception occurred during Behavior execution:
> > java.lang.NullPointerException at
> >
>
AWTInteractionBehavior.processStimulus(AWTInteractionBehavior.java:37)
> > at
> >
>
javax.media.j3d.BehaviorScheduler.doWork(BehaviorScheduler.java:174)
> > at
> javax.media.j3d.J3dThread.run(J3dThread.java:256)
> >
> > I think it's got something to do with what my
> behavior
> > is attached to, as if i was rotating a cube I
> would
> > attach to the cube, but as I want to add to the
> scene,
> > i need to attach to the whole scene, but it
> doesn't
> > like that, I don't think?
> > Any ideas/code/help??
> >
> > Cheers
> > KP
> >
> >
> >
> >
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