跟着抄一个：

#include <Windows.h>
#include <iostream>
#include <string>
#include <filesystem>

#include <osgViewer/Viewer>
#include <osgDB/ReadFile>
#include <osgDB/WriteFile>

using namespace std;


static void findDir(const string& dir, vector<string>& subDirs)
{
	//
	subDirs.clear();

	for (auto& i : filesystem::directory_iterator(dir)) {
		if (i.path().string() == "." || i.path().string() == "..")
			continue;
		if (i.is_directory()) {
			subDirs.push_back(i.path().string());
		}
	}
}

static std::string DirOrPathGetName(std::string filePath)
{
	size_t m = filePath.find_last_of('\\');
	if (m == string::npos)
	{
		return filePath;
	}

	size_t p = filePath.find_last_of('.');
	if (p != string::npos && p > m)
	{
		filePath.erase(p);
	}

	std::string dirPath = filePath;
	dirPath.erase(0, m + 1);
	return dirPath;
}
//创建倾斜索引
void createObliqueIndexes(std::string fileDir)
{
	string dataDir = fileDir + "/Data";

	osg::ref_ptr<osg::Group> group = new osg::Group();
	vector<string> subDirs;
	findDir(dataDir, subDirs);

	for (size_t i = 0; i < subDirs.size(); i++)
	{
		string name = DirOrPathGetName(subDirs[i]);
		string path = subDirs[i] + "/" + name + ".osgb";

		if (!filesystem::exists(path))
			continue;
		osg::ref_ptr<osg::Node> node = osgDB::readNodeFile(path);
		osg::ref_ptr<osg::PagedLOD> lod = new osg::PagedLOD();
		if (!node.valid())
			continue;
		//auto bs=node->computeBound();
		auto bs = node->getBound();
		auto c = bs.center();
		auto r = bs.radius();
		lod->setCenter(c);
		lod->setRadius(r);
		lod->setRangeMode(osg::LOD::RangeMode::PIXEL_SIZE_ON_SCREEN);
		osg::ref_ptr<osg::Geode> geode = new osg::Geode;
		geode->getOrCreateStateSet();
		lod->addChild(geode.get());

		std::string relativeFilePath = "./Data/" + name + "/" + name + ".osgb";

		lod->setFileName(0, "");
		lod->setFileName(1, relativeFilePath);

		lod->setRange(0, 0, 1.0);																							//第一层不可见
		lod->setRange(1, 1.0, FLT_MAX);

		lod->setDatabasePath("");

		group->addChild(lod);
	}
	std::string outputLodFile = fileDir + "/Data.osgb";
	osgDB::writeNodeFile(*group, outputLodFile);
}

int main(int argc, char* argv[])
{
	if (argc < 2)
		return -1;
	if (!filesystem::exists(argv[1]))
		return -1;
	std::string fileDir = argv[1];
	//std::string fileDir = "E:/GIS/广州/关于树的研究/OSGB";
	
	// 检查路径是否存在
	if (filesystem::exists(fileDir)) {
		std::cout << fileDir << std::endl;
	}
	else {
		std::cout << "Directory does not exist." << std::endl;
	}

	std::string outputLodFile = fileDir + "/Data.osgb";
	createObliqueIndexes(fileDir);

	osgViewer::Viewer viewer;
	osg::Node* node = new osg::Node;
	node = osgDB::readNodeFile(outputLodFile);
	viewer.setSceneData(node);
	viewer.setUpViewInWindow(50, 50, 800, 600);
	return viewer.run();
}

 抄了之后知道怎么运行吧？代码拆解随后记录，当下流程还没彻底跑通咯！

代码build生成exe，打包exe之后运行，效果如下：