Joerg,
FYI. The bug is in BranchGroup under SharedGroup. Due to this bug,
the use of BranchGroup under a SharedGroup should only be so if it is
necessary, such as the need to detach/attach dynamically.
In your test program, you've created a n-level deep sub-graph,
with a BranchGroup at each begining level :
/**
* Create subgraph of a certain depth.
*/
static int numNodesCreated = 0;
Node createDeepSubGraph( int depth )
{
BranchGroup g = new BranchGroup();
// If possible replace the above line with :
// Group g = new Group();
// as a workaround.
..... deleted code .....
}
and the final sub-graph is added to a SharedGroup. Hence creating
a scene-graph consists of a SharedGroup with n BranchGroups, in
a skewed arrangement; a possibly worst case for this bug. :-)
The workaround to this bug is not to use BranchGroup under SharedGroup
if possible. If BranchGroup is really needed under SharedGroup, use
flat and shallow sub-graph rather than deep and skewed sub-graph.
thanks,
Chien Yang
Java 3D Team.
> Date: Mon, 08 Jul 2002 12:01:09 -0700
> From: Chien Yang <[EMAIL PROTECTED]>
> Subject: Re: [JAVA3D] Trouble with Link/SharedGroup - is it a Java3D bug??
> To: [EMAIL PROTECTED]
> MIME-version: 1.0
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>
> Joerg,
> Thanks for your bug report. It is a regression bug in Java 3D 1.3
> beta1 and 2. Too bad we were unable to uncover this bug earlier, so it
> will *not be* in the coming Java 3D 1.3 FCS release. We will try to
> understand the cause of this bug. We'll post a workaround to this bug on
> the alias, if we found one.
>
> thanks,
>
> - Chien Yang.
> Java 3D Team.
>
>
> > Date: Sat, 06 Jul 2002 11:19:53 +0200
> > From: Joerg 'Herkules' Plewe <[EMAIL PROTECTED]>
> > Subject: Re: [JAVA3D] Trouble with Link/SharedGroup - is it a Java3D bug??
> > To: [EMAIL PROTECTED]
> > MIME-version: 1.0
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> >
> > Hm, may a SUN guy should comment on the topic? SharedGroups are a powerful
> > concept - if they work!
> >
> > ? Is it a bug, then will it be fixed?
> > ? Is it a misunderstanding, then how should they be used?
> > ? If non of the former, it should be documented that Links/SharedGroups
> > should be avoided bc. they don't work and replaced by cloneTree() whereever
> > possible?
> >
> > There are some constructs that are hard to do w/o SharedGroup, e.g. if you
> > wanted to spin all trees on a terrain synchronously by just updating a
> > single TG.
> >
> > Currently this can be done for a tree typically is a trivial sub-scenegraph.
> > But dare the tree is a fractally computed one, that consists of many Nodes
> > itself! See the effect from my sample....
> >
> > - J
> >
> > ----- Original Message -----
> > From: "Lan Wu-Cavener" <[EMAIL PROTECTED]>
> > To: <[EMAIL PROTECTED]>
> > Sent: Friday, July 05, 2002 9:05 PM
> > Subject: Re: [JAVA3D] Trouble with Link/SharedGroup - is it a Java3D bug??
> >
> >
> > > Yes, memory usage is huge, performance is poor compared to what I am using
> > > (Geometry By-Reference) now. I only turned the visibility on or off to
> > > avoid detaching the BranchGroup( another performance drop). But has never
> > > had geometry being altered or mix up. I don't use beta version either.
> > >
> > >
> > > At 01:54 PM 7/5/2002 -0500, you wrote:
> > >
> > > >Increased memory usage, poorer than expected performance, renderbin
> > > >crashes (stopped when sharedgroups/links were removed), and geometry
> > > >seemingly getting altered and mixed up (a leg on one of my characters
> > > >suddenly replaced by a tree). That sort of thing. That was with 1.2
> > > >though... haven't tried with the most recent beta.
> > > >
> >
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