I had some inconsistencies with Links and shared groups as well, and even
stopped using them when I couldn't figure out what I was doing wrong (memory
use extreme, visual glitches, no perceived benefit to using them...) Will
try to find my notes.
Scott
----- Original Message -----
From: "Joerg 'Herkules' Plewe" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, July 05, 2002 6:48 AM
Subject: Re: [JAVA3D] Trouble with Link/SharedGroup - is it a Java3D bug??
> Subject: Re: [JAVA3D] Trouble with Link/SharedGroup - is it a Java3D bug??
>
>
> > We also use shared groups to put in trees, boulders, etc, but we haven't
> > put all that many into a scene yet. I've not noticed any specific
> > memory issues (Java 3D is a memory hog but we all know that).
>
> Sigh, ok, nobody seems to believe me....
>
> Here is a small code snippet that demonstrates the effect (e.g. in a
> HelloUniverse environment).
> I turns out that the memory consumption depends on the complexity/depth of
> the subtree that
> is used below the SharedGroup. I create an arbitrary tree with some
> ColorCubes and TGs and
> either Link/SharedGroup or cloneTree() it. The bigger the subtree, the
> better the Link-solution
> should be. In cases where the subtree in question only consists of one or
> two groups, it should
> not make any difference at all anyway.
>
> The samples creates only 10 clones/links. While cloning keeps the memory
> consumption well
> below 40megs, Link gives an OutOfMemoryException even with -Xmx256mb.
>
> A smaller test (createDeepSubGraph(6)) works marginally with 256MB and
> produces
> 2.021.371 instances of javax.media.j3d.BranchGroupRetained.
>
> I'd really appreciate if someone could confirm my observation.
>
>
> ================================================================
>
> /**
> * Create a subgraph with 10 objects by either Linking or cloning an
> object.
> */
> Node create10Objects( boolean clone )
> {
> Group grp = new Group();
>
> // Create a non-trivial subgraph
> Node object = createDeepSubGraph( 7 );
> System.out.println( numNodesCreated );
>
> // Setup sharedgroup
> SharedGroup shared = null;
> if ( ! clone )
> {
> shared = new SharedGroup();
> shared.addChild( object );
> }
>
> // Add the objects
> for ( int i = 0; i < 10; i++ )
> {
> TransformGroup tg = new TransformGroup();
> Transform3D t3d = new Transform3D();
> t3d.setTranslation( new Vector3f( i * 2.0f, 0.0f, i * 2.0f ) );
> tg.setTransform( t3d );
>
> // either link or clone the object
> if ( clone )
> tg.addChild( object.cloneTree() );
> else
> tg.addChild( new Link( shared ) );
>
> grp.addChild( tg );
> }
> return grp;
> }
>
>
> /**
> * Create subgraph of a certain depth.
> */
> static int numNodesCreated = 0;
> Node createDeepSubGraph( int depth )
> {
> BranchGroup g = new BranchGroup();
>
> // One new cube...
> g.addChild( new ColorCube( 0.1 ) );
> numNodesCreated++;
>
> // ...and maybe two subgraphs
> if ( depth > 0 )
> {
> Transform3D t3d = new Transform3D();
> Transform3D t3d2 = new Transform3D();
> TransformGroup tg;
>
> t3d.setScale( 0.2 * (double)depth );
> t3d2.setTranslation( new Vector3f( 0.2f, -0.2f, 0.0f ) );
> t3d.mul( t3d2 );
> tg = new TransformGroup();
> tg.setTransform( t3d );
> tg.addChild( createDeepSubGraph( depth - 1 ) );
> g.addChild( tg );
>
> t3d.setScale( 0.2 * (double)depth );
> t3d2.setTranslation( new Vector3f( -0.2f, -0.2f, 0.0f ) );
> t3d.mul( t3d2 );
> tg = new TransformGroup();
> tg.setTransform( t3d );
> tg.addChild( createDeepSubGraph( depth - 1 ) );
> g.addChild( tg );
> }
> return g;
> }
>
>
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