Hi Philip,
The way I build paged database is as a quad tree, I wouldn't recommend
having a flat layout of PagedLOD's.
I'd also recommend keeping the PagedLOD tiles small, well under the MB
size. This makes the paging in of tiles from disk and to graphics
hardware much more fine grained - resulting in smoother frame rates.
I'd suspect its the layout of your database that is causing the
problems rather than the DatabasePager.
Robert.
On 1/11/07, Philip Lowman <[EMAIL PROTECTED]> wrote:
Robert Osfield wrote:
> How are you integrating the DatabasePager into your app? I don't see
> problems with memory problems like you describe with osgviewer and
> osgProducer::Viewer related apps.
> Are you able to recreate the problems with these?
Right now I am using osgviewer directly to load a small pre-generated
OSG file with the plod's in it.
> The reason why I raise this is that I've pretty heavily tested the
> paging and expiry of subgraphs and believe it to work just fine.
I might be entirely off base here so I'll include what I'm doing but
I've mentioned it on here before so I'm operating under the assumption
that what I have here is reasonable.
toplevel_group_node
plod_1 plod_2 plod_3 ...plod_n
Each plod has one active range and one database tied to that range.
Right now the ranges go from 0 to 6*radius of the terrain segment. The
filenames being paged in are ~30MB ive file converted from OpenFlight.
for(unsigned int i=0; i < terrain_filenames.size(); ++i)
{
// obtain center position
double radius = bboxes[i].radius();
osg::Vec3 center = bboxes[i].center();
// setup new lod
osg::PagedLOD *lod = new osg::PagedLOD();
lod->setName("plod for " + terrain_filenames[i]);
lod->setRangeMode(osg::LOD::DISTANCE_FROM_EYE_POINT);
lod->setFileName(0, terrain_filenames[i]);
lod->setPriorityOffset(0, 1);
lod->setPriorityScale(0, 1.0f);
lod->setCenter(center);
lod->setRadius(radius);
lod->setRange(0, 0.0f, bboxes[i].radius() * 6.0); // FIXME
lod->setNumChildrenThatCannotBeExpired(0);
group->addChild(lod);
}
--
Philip Lowman
Simulation Development Engineer, Modeling and Simulation Technology
General Dynamics Land Systems
http://www.gdls.com
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