Lee,
Do you have a test program to share with us ?
- Chien Yang
Java 3D Team.
> MIME-Version: 1.0
> Date: Mon, 23 Apr 2001 16:34:16 -0400
> From: "J. Lee Dixon" <[EMAIL PROTECTED]>
> Subject: Re: [JAVA3D] Range ordering of transparent objects
> Comments: To: Doug Twilleager <[EMAIL PROTECTED]>
> To: [EMAIL PROTECTED]
>
> Doug,
> I turned off compiling of my scene and placed a BranchGroup above my
> OrderedGroup. Next, I changed all my child nodes to plain Group nodes.
> Still was very slow. Then I turned off all reordering and left *just*
> the detach/attach of my OrderedGroup. Still slow. Finally, I did some
> profiling....
>
> long time1 = System.currentTimeMillis();
> for(i = 0; i < 5; i++)
> {
> myBranch.detach();
> myParent.addChild( myBranch );
> }
> long time2 = System.currentTimeMillis();
> System.out.println(" AVG TIME = " + ((float)(time2-time1) * 0.2f) );
>
> AVG TIME = 46.0
> AVG TIME = 70.200005
> AVG TIME = 50.0
> AVG TIME = 74.200005
> AVG TIME = 146.2
> AVG TIME = 84.200005
> AVG TIME = 66.200005
> AVG TIME = 90.0
> AVG TIME = 66.200005
> AVG TIME = 264.4
> AVG TIME = 76.200005
> AVG TIME = 108.200005
> AVG TIME = 86.0
>
> These times are in milliseconds. Actually, I even changed it to do a
> single attach/detach timing:
>
> AVG TIME = 70.0
> AVG TIME = 90.0
> AVG TIME = 60.0
> AVG TIME = 90.0
> AVG TIME = 841.0
> AVG TIME = 90.0
> AVG TIME = 151.0
> AVG TIME = 90.0
> AVG TIME = 140.0
> AVG TIME = 90.0
> AVG TIME = 80.0
> AVG TIME = 120.0
>
> I know that Win2k timing is only good for 10ms, but there's a couple
> pretty big ones in there. What can I do about this? If there is no way
> around this, then how can I *ever* do range-ordering?? If the new
> capability in 1.3 won't be available until later this year, how about an
> interim release that just allows for *quick* reordering of OrderedGroup
> nodes as a workaround? At least the problem would then be workable.
>
> Thx
> -Lee
>
> > -----Original Message-----
> > From: Doug Twilleager [mailto:[EMAIL PROTECTED]]
> > Sent: Monday, April 23, 2001 3:17 PM
> > To: [EMAIL PROTECTED]
> > Subject: Re: [JAVA3D] Range ordering of transparent objects
> >
> >
> > The only way to get the compile out of the way is to compile the
> > scene without your OrderedGroup's, and then add them in after
> > the compile. Other than that, I don't see any other ways
> > to do this in 1.2.*.
> >
> > Doug Twilleager
> > Sun Microsystems
> >
> >
> > >To: "'Doug Twilleager'" <[EMAIL PROTECTED]>,
> > [EMAIL PROTECTED]
> > >Subject: RE: [JAVA3D] Range ordering of transparent objects
> > >MIME-Version: 1.0
> > >
> > >Doug,
> > >The only way to rearrange the children of the OrderedGroup is to do
> > >attaches and reattaches of BranchGroups since I get an
> > exception if I do
> > >a "setChild(Node, index)" without the child being a
> > BranchGroup. This
> > >is from the Group.setChild() Javadoc:
> > >
> > >"RestrictedAccessException - if this group node is part of live or
> > >compiled scene graph and the child node being set is not a
> > BranchGroup
> > >node"
> > >
> > >Since they are BranchGroups, I still get the overhead of doing
> > >attach/detach with each child. My code for swapping
> > children looks like
> > >this:
> > >
> > > in constructor...
> > > {
> > > ...
> > > empty = new BranchGroup();
> > > empty.setCapability(BranchGroup.ALLOW_DETACH);
> > > ...
> > > }
> > >
> > > private void doReordering()
> > > {
> > > myBranch.detach(); // detach OrderedGroup from scene
> > >
> > > // Call "swapBranches" as necessary
> > >
> > > myParent.addChild( myBranch );
> > > }
> > >
> > > private void swapBranches(int a, int b)
> > > {
> > >
> > > BranchGroup b1 = (BranchGroup)myOrderedGroup.getChild( a );
> > > BranchGroup b2 = (BranchGroup)myOrderedGroup.getChild( b );
> > > myOrderedGroup.setChild( empty, a ); // I think this calls
> > >b1.detach()
> > > myOrderedGroup.setChild( b1, b );
> > > myOrderedGroup.setChild( b2, a );
> > > }
> > >
> > >What do you think I can do? Is there a way to prevent my
> > OrderedGroup
> > >from being compiled so I don't have to use BranchGroups for the
> > >children??
> > >
> > >Thx
> > >-Lee
> > >
> > >> -----Original Message-----
> > >> From: Doug Twilleager [mailto:[EMAIL PROTECTED]]
> > >> Sent: Monday, April 23, 2001 1:23 PM
> > >> To: [EMAIL PROTECTED]
> > >> Subject: Re: [JAVA3D] Range ordering of transparent objects
> > >
> > ><snip...>
> > >
> > >> If you detach the branch graph which contains the
> > >> OrderedGroup, rearrange
> > >> the OrderedGroup, then reattach again, you will get better
> > performance
> > >> that attaching and reattaching the children of the
> > >> OrderedGroup individually.
> > >>
> > >> Doug Twilleager
> > >> Sun Microsystems
> > >>
> >
> > ==============================================================
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> >
>
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