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
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