Turn a model into a paged lod

plodify.cpp

#include <osg/ArgumentParser>
#include <osg/PagedLOD>
#include <osgDB/ReadFile>
#include <osgDB/WriteFile>
#include <iostream>

int
main(int argc, char** argv)
{
    osg::ArgumentParser arguments(&argc,argv);

    // load your model:
    auto node = osgDB::readRefNodeFile(argv[1]);
    if (node.valid())
    {
        // bounds of the model:
        auto bs = node->getBound();

        // make a PLOD with the model's bounding sphere:
        osg::ref_ptr<osg::PagedLOD> plod = new osg::PagedLOD();
        plod->setCenter(bs.center());
        plod->setRadius(bs.radius());

        // model to load on demand:
        plod->setFileName(0, argv[1]);

        // set up the LOD parameters:
#ifdef USE_DISTANCE_BASED_LODS
        plod->setRangeMode(osg::LOD::DISTANCE_FROM_EYE_POINT);
        plod->setRange(0, 0.0f, bs.radius() * 3.0f);
#else
        plod->setRangeMode(osg::LOD::PIXEL_SIZE_ON_SCREEN);
        plod->setRange(0, 25.0f, FLT_MAX);
#endif

        // dump out the osgt file.
        osgDB::writeNodeFile(*plod.get(), "out.osgt");
    }

    return 0;
}