thank you very much Daniel!! I was a week searching for a solution in books,
tutorials... but I couldn't find it.
> -----Original Message-----
> From: Discussion list for Java 3D API
> [mailto:[EMAIL PROTECTED]]On Behalf Of Daniel del R�o
> Sent: jueves 6 de enero de 2000 0:33
> To: [EMAIL PROTECTED]
> Subject: Re: [JAVA3D] PickingCallback interface
>
>
> Hi Javier,
> The method transformChanged(int type, TransformGroup t) could
> return a null in the t
> paremeter.
> The transformGroup is the object taht PickRotateBehavior
> modifies, the type is:
> NO_PICK (in this case the transformGroup t is null !!!!!!!!!!!!)
> ROTATE (the PickRotateBehavior modifies the transformgroup)
> TRANSLATE (the PickTranslateBehavior )
> ZOOM (The PickZoomBehavior)
>
> Your code should check the type,
>
> if (type == PickingCallback.NO_PICK) {
> System.out.println("NO pick");
> else {
> 326: t.getTransform(t3);
> 327: t3.get(v3f);
> 327: System.out.println("Picking
> <"+v3f.x+","+v3f.y+","+v3f.z+">");
> }
>
> Regards,
>
> Dani.
>
>
> > my code is
> >
> > 321: public class MyCallbackClass extends Object implements
> > PickingCallback{
> > 322: Transform3D t3=new Transform3D();
> > 323: Vector3f v3f=new Vector3f();
> >
> > 325: public void transformChanged(int type, TransformGroup t) {
> > 326: t.getTransform(t3);
> > 327: t3.get(v3f);
> > 327: System.out.println("Picking
> <"+v3f.x+","+v3f.y+","+v3f.z+">");
> > }
> > }
> >
> > but sometimes, when I'm moving in the world, it gives me the next error:
> >
> > Exception ocurred during Behavior execution:
> > java.lang.NullPointerException
> > at
> MyProgram$MyCallbackClass.transformChanged(MyProgram.java:326)
> > ...
> >
> > First of all: The TransformGroup in the transformChanged method... which
> > TransformGroup is it??
> > I mean, if I have some of them in the same
> ScenePath, the TransformGroup
> > is the parent, or the first starting in the Locale??
> > Second: Why that error appear? I have the KeyNavBehavior and
> when I 'walk'
> > over the object I want to rotate, sometimes nothing
> happend and another
> > times the previous error appear!!
> >
> > Thank you and Sorry for my English
> >
> > Javi
> >
> >
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