Thanks Robert. I'll just submit my patch and get feedback from there.
Cheers,
Farshid
On Mon, May 20, 2013 at 11:59 PM, Robert Osfield
<robert.osfi...@gmail.com>wrote:
> HI Farshid,
>
> The TargetMaximumNumberOfPageLOD is a hint to the pager to try and
> expire inactive PageLOD so that the total number stays at or below the
> specified number. It only expires inactive PagedLOD though, so it's a
> target not a hard fast measure, if the current view requires more than
> the target then PagedLOD are active and can't be discarded.
>
> If you've found an error in the maths or a better scheme for working
> out which to expire then send it along to osg-submissions. The scheme
> has to be efficient as not to bog down the pager or update threads.
>
> Robert.
>
> On 21 May 2013 04:41, Farshid Lashkari <fla...@gmail.com> wrote:
> > Hi,
> >
> > I'm hoping to get some clarification on how the
> > DatabasePager::setTargetMaximumNumberOfPageLOD is supposed to work. I am
> > setting this value to 3 in my application. I then use the following
> function
> > to create and add PagedLODs the the scene:
> >
> > void AddPagedLOD()
> > {
> > osg::ref_ptr<osg::PagedLOD> lod = new osg::PagedLOD;
> > lod->addChild( new osg::Group, 10.0f, FLT_MAX );
> > lod->setFileName(1,"large.osgb");
> > lod->setRange(1,0.0f,10.0f);
> > root->addChild(lod);
> > }
> >
> > When I add 3 PagedLODs to my scene and have them load the file, they are
> > never released from memory once I leave the active range. This makes
> sense
> > since the number PagedLODs is not above the target.
> >
> > However, when I add 4 PagedLODs then leave the active range, all 4 files
> are
> > released from memory. I was expecting only 1 of the files to be released.
> >
> > Am I misunderstanding the behavior of this setting or should only 1 file
> be
> > released in this case?
> >
> > I had a quick glance at the DatabasePager source and was able to make two
> > small changes to get the behavior I was expecting. However, I don't have
> > much experience dealing with PagedLODs and wanted to verify that this
> should
> > be the correct behavior before submitting a patch.
> >
> > Cheers,
> > Farshid
> >
> >
> > _______________________________________________
> > osg-users mailing list
> > osg-users@lists.openscenegraph.org
> >
> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
> >
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