5，保存4个一级节点

前面是一个牛和一个滑翔机，位置都在原点，

远处是牛，近处是滑翔机，可以自然而然地把牛当作0级节点，滑翔机作为一级节点，那么，能不能输出四个不同位置的滑翔机，类似于四叉树一样。

没有什么不可以。

输出四个不同位置的osg::MatrixTransform即可。

复制代码

for (int childIndex = 0; childIndex < 4; childIndex++)
{

	std::string strOutputName = strOutputDir + 
		"root_" + std::to_string(rootIndex) +
		"_level_" + std::to_string(level) + 
		"_child_" + std::to_string(childIndex) +".osg";
	osg::Vec3 center = centerVector[childIndex];
	osg::Matrix mat;
	mat.setTrans(center);
	osg::ref_ptr<osg::MatrixTransform> trans = new osg::MatrixTransform();
	trans->setMatrix(mat);
	trans->addChild(node);
	osgDB::writeNodeFile(*trans, strOutputName);
}

代码如下：

#include <osgViewer/Viewer>

#include <osg/Node>

#include <osgdb/ReadFile>

#include <osgDB/WriteFile>

#include <osg/PagedLod>

#include <osgGA/TrackballManipulator>

#include <osg/MatrixTransform>

#include <osg/Matrix>

int main()

{

int rootIndex = 0;

int level = 1;

std::string strOutputDir = "d:/test/1/";

osg::Vec3 center_child0(-5, 0, -5);

osg::Vec3 center_child1(-5, 0, 5);

osg::Vec3 center_child2(5, 0, -5);

osg::Vec3 center_child3(5, 0, 5);

复制代码

std::vector<osg::Vec3> centerVector;
centerVector.clear();
centerVector.push_back(center_child0);
centerVector.push_back(center_child1);
centerVector.push_back(center_child2);
centerVector.push_back(center_child3);
std::string strInputName = "D:/install/osg365_oe210_vs2019/OpenSceneGraph-Data/glider.osg";
osg::ref_ptr<osg::Node> node = osgDB::readNodeFile(strInputName);

for (int childIndex = 0; childIndex < 4; childIndex++)
{

	std::string strOutputName = strOutputDir + 
		"root_" + std::to_string(rootIndex) +
		"_level_" + std::to_string(level) + 
		"_child_" + std::to_string(childIndex) +".osg";
	osg::Vec3 center = centerVector[childIndex];
	osg::Matrix mat;
	mat.setTrans(center);
	osg::ref_ptr<osg::MatrixTransform> trans = new osg::MatrixTransform();
	trans->setMatrix(mat);
	trans->addChild(node);
	osgDB::writeNodeFile(*trans, strOutputName);
}

}