Justin,
I reread Sean's email and it seems to be a totally different problem.
Sean's question is on Group.numChildren() :
*********** Sean's email **********
What happens when BranchGroup.addChild(null) is called?
I was hoping to use the 'null' as a placeholder that I could replace later with
a call to setChild(), but the addition of 'null' to the BranchGroup child list
seems transient. Immediately after adding the right number of 'null's to a
BranchGroup (to get the number of children correct for replacement later), the
method numChildren() reports the correct number of children. However, when
numChildren() is later (in another method) called on this same BranchGroup, the
value returned is zero.
Any ideas?
***********************************
and yours is on NPE with setChild(). I've just tried addChild(null) and
it went thro. with no NPE. Can you please verify it ?
thanks,
- Chien Yang.
Java 3D Team.
> Date: Fri, 12 Jul 2002 10:27:25 -0700
> From: Justin Couch <[EMAIL PROTECTED]>
> Subject: Re: [JAVA3D] BranchGroups
> To: [EMAIL PROTECTED]
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>
> Chien Yang wrote:
> > Sean and Justin,
> >
> > I'm a little confuse on whether the NPE is on addChild() or
> > setChild(). We did fix a bug reported by Justin in j3d1.3beta2 :
> >
> > BugId 4633672 : Group.setChild() may throw NullPointerException.
>
> Hmmm.. That's interesting because I thought I reported it on the
> addChild() not setChild(). Oh well, I could be wrong on that. :( I had
> to remove the addChild() calls at the same time because it is pointless
> having those when I can't setChild() as well so I may have missed a
> secondary bug there.
>
> Anyway, the basic process is that during the scene graph the process is
> to addChild(null) as a placeholder for nodes that you want to add later.
> Then, later on, you just do setChild(new_node_pointer, 0); The idea
> behind this is that it is one less capability bit to need to switch on.
> Instead of needing both write and extend, you just need write capabilities.
>
> --
> Justin Couch http://www.vlc.com.au/~justin/
> Java Architect & Bit Twiddler http://www.yumetech.com/
> Author, Java 3D FAQ Maintainer http://www.j3d.org/
> -------------------------------------------------------------------
> "Humanism is dead. Animals think, feel; so do machines now.
> Neither man nor woman is the measure of all things. Every organism
> processes data according to its domain, its environment; you, with
> all your brains, would be useless in a mouse's universe..."
> - Greg Bear, Slant
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