Hi Maxim, I'm confused why you think that the memory isn't getting freed. The OSG will be freeing the memory automatically when the viewer/database goes out scope / and at by the DatabasePager at runtime when children go out of range and get expired. Please note that expiry happens on demand (default) or based on time depending on how the DatabasePager is configure. In the default case the pager won't expire anything till more than a specified target number PagedLOD is reached, beyond this target it works to expire children to keep the total down to the target.
To cut a long store short, it'll almost certainly be doing exactly what you need out of the box, and there is no need to worry about it. Robert. On Sat, Dec 12, 2009 at 5:26 PM, Maxim Gammer <[email protected]> wrote: > Hi everybody. I need to figure out the PagedLOD technology... > > I've tried the following example, everything worked fine... > > osg::ref_ptr<osg::PagedLOD> plod = new osg::PagedLOD(); > > plod->setName("plod for "); > > plod->setRangeMode(osg::LOD::DISTANCE_FROM_EYE_POINT); > > std::string Filename1 = "/home/maximum2000/LABS/PLOD/osg/1.osg"; > > std::string Filename2 = "/home/maximum2000/LABS/PLOD/osg/2.osg"; > > std::string Filename3 = "/home/maximum2000/LABS/PLOD/osg/3.osg"; > > std::string Filename4 = "/home/maximum2000/LABS/PLOD/osg/4.osg"; > > plod->setFileName (0, Filename1); > > plod->setRange (0, 0.0f, 100.0f); > > plod->setFileName (1, Filename2); > > plod->setRange (1, 100.0f, 200.0f); > > plod->setFileName (2, Filename3); > > plod->setRange (2, 200.0f, 300.0f); > > plod->setFileName (3, Filename4); > > plod->setRange (3, 300.0f, 1000.0f); > > plod->setNumChildrenThatCannotBeExpired(1); > > root->addChild(plod); > > osgDB::writeNodeFile(*root, "/home/maximum2000/LABS/PLOD/osg/saved.osg"); > > > > But memory doesn't get free. As result, there is all the data in > memory while watching all 4 LODs (from different distance). > > If a get it right, I need to use osgDB::DatabasePager to unload all > "inactive" objects. > > Is that true? > > I've tried to do as follows: > > 1. Added the code: > > .... > > viewer = new osgViewer::Viewer(); > > dbPager = osgDB::DatabasePager::create(); > > dbPager->setCompileGLObjectsForContextID (0, true); > > dbPager->setDoPreCompile(true); > > viewer->getScene()->setDatabasePager(dbPager); > > 2. And appended the folloing string into the code from beginning of this > message. > > ....... > > root->addChild(plod); > > dbPager->registerPagedLODs(plod) ; > > 3. Every frame is called by > > ...... > > viewer->getDatabasePager()->updateSceneGraph(*(viewer->getFrameStamp())); > > ..... > > But memory still doesn't get free. There is all the data, not only visible. > > Did I understand everythig right? Why doesn't memory get free? > > > > Maxim Gammer > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
