osg demo26 LOD頭結點

//DEMO26
//功能：輸出free.osg ，這個模型是fountain的變換，使fountain在3000米外不顯示


#include <osgDB/Registry>
#include <osgDB/ReadFile>
#include <osgDB/ReaderWriter>
#include <osgDB/WriteFile>
#include <osg/Node>
#include <osgViewer/Viewer>
#include <osg/LOD>

int main()
{
	osgViewer::Viewer viewer;
	osg::Node* node = osgDB::readNodeFile("fountain.osg");
	//LOD結點
	osg::LOD* lod = new osg::LOD;
	//添加結點並設置視距
	lod->addChild(node,0,3000);
	viewer.setSceneData(lod);
	osgDB::writeNodeFile(*(viewer.getSceneData()),"free.osg",osgDB::Registry::instance()->getOptions());
	return 0;
}