如何知道osg模型每个节点的名称

问题的提出：

有时我们需要按节点名称找出模型中的节点，例如如下代码：

class findNodeVisitor : public osg::NodeVisitor
{

public:

	findNodeVisitor();
	findNodeVisitor(const std::string &searchName);


	virtual void apply(osg::Node &searchNode);
	virtual void apply(osg::Transform &searchNode);


	void setNameToFind(const std::string &searchName);
	osg::Node* getFirst();
	typedef std::vector nodeListType;
	nodeListType& getNodeList() { return foundNodeList; }

private:

	std::string searchForName;
	nodeListType foundNodeList;

};

findNodeVisitor::findNodeVisitor() : osg::NodeVisitor(TRAVERSE_ALL_CHILDREN), searchForName()
{

}

findNodeVisitor::findNodeVisitor(const std::string &searchName) : osg::NodeVisitor(TRAVERSE_ALL_CHILDREN), searchForName(searchName)
{

}

void findNodeVisitor::setNameToFind(const std::string &searchName)
{

	searchForName = searchName;
	foundNodeList.clear();

}

osg::Node* findNodeVisitor::getFirst()
{

	return *(foundNodeList.begin());

}

void findNodeVisitor::apply(osg::Node &searchNode)
{

	if (searchNode.getName() == searchForName)
	{

		foundNodeList.push_back(&searchNode);
	}

	traverse(searchNode);
}

void findNodeVisitor::apply(osg::Transform &searchNode)
{

	osgSim::DOFTransform* dofNode =
		dynamic_cast (&searchNode);

	if (dofNode)
	{

		dofNode->setAnimationOn(false);
	}

	apply((osg::Node&) searchNode);
	traverse(searchNode);

}
int main()
{
	// 初始化变量和模型，建立场景
	osg::ref_ptr viewer = new osgViewer::Viewer();
	osg::ref_ptr root = new osg::Group();
	osg::ref_ptr tankNode = osgDB::readNodeFile("d:\\1.OSGB");
	root->addChild(tankNode.get());
     
    findNodeVisitor findGun("gun"); 
	root->accept(findGun);

    //优化场景数据
	osgUtil::Optimizer optimizer;
	optimizer.optimize(root.get());
 
	//设置场景数据
	viewer->setSceneData(root.get());
 
	//初始化并创建窗口
	viewer->realize();
 
	//开始渲染
	viewer->run();
 
	return 0;


}

在上面的代码段main函数中的如下代码：

 findNodeVisitor findGun("gun"); 
中的”gun“表示按节点名称来查找，只找模型中名称为"gun"的节点，有时我们从3D建模人员拿到的模型文件他们也不记得模型中各个节点的名称了，那我们怎么办呢？我们可以用如下代码枚举出模型中的每个节点的名称、库名、类名，如下：

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
using namespace std;
#ifdef WIN32
#include
#endif

string Utf8ToGB2312(const std::string& strUtf8)
{
	std::wstring_convert> cutf8;
	std::wstring wTemp = cutf8.from_bytes(strUtf8);
#ifdef _MSC_VER
	std::locale loc("zh-CN");
#else
	std::locale loc("zh_CN.GB18030");
#endif
	const wchar_t* pwszNext = nullptr;
	char* pszNext = nullptr;
	mbstate_t state = {};

	std::vector buff(wTemp.size() * 2);
	int res = std::use_facet >
		(loc).out(state,
			wTemp.data(), wTemp.data() + wTemp.size(), pwszNext,
			buff.data(), buff.data() + buff.size(), pszNext);

	if (std::codecvt_base::ok == res)
	{
		return std::string(buff.data(), pszNext);
	}

	return "";
}
class InfoVisitor : public osg::NodeVisitor
{
public:
	InfoVisitor()
	:osg::NodeVisitor(TRAVERSE_ALL_CHILDREN), _indent(0)
	{}
	
	virtual void apply(osg::Node& node)
	{
		for (int i = 0; i < _indent; i++)  
			cout << "    ";

		cout << "[" << _indent << "]" << node.libraryName()
		     << "::" << node.className() << "----" << Utf8ToGB2312(node.getName()) << endl;
		
			_indent++;
	        traverse(node);
	        _indent--;
		
			for (int i = 0; i < _indent; i++)  
				cout << "    ";

			cout << "[" << _indent << "] " << node.libraryName()
			     << "::" << node.className() << "----" << Utf8ToGB2312(node.getName()) << endl;
	}
	
	virtual void apply(osg::Geode& node)
	{
		for (int i = 0; i < _indent; i++)  
			cout << "    ";
	
		cout << "[" << _indent << "] " << node.libraryName()
	         << "::" << node.className() << "----" << Utf8ToGB2312(node.getName()) << endl;
		
			_indent++;
		
		for (unsigned int n = 0; n < node.getNumDrawables(); n++)
		{
			osg::Drawable* draw = node.getDrawable(n);
				if (!draw)
					continue;

			for (int i = 0; i < _indent; i++)  
				cout << "    ";
			
			cout << "[" << _indent << "]" << draw->libraryName() << "::"
		         << draw->className() << "----" << Utf8ToGB2312(node.getName()) << endl;
		}
		
		traverse(node);
		_indent--;
		
		for (int i = 0; i < _indent; i++)  
			cout << "    ";
		
		cout << "[" << _indent << "]" << node.libraryName()
	         << "::" << node.className()  << "----" << Utf8ToGB2312(node.getName()) <<  endl;
	}
 private:
	    int _indent;
};
int main()
{
	// 初始化变量和模型，建立场景
	osg::ref_ptr viewer = new osgViewer::Viewer();
	osg::ref_ptr root = new osg::Group();
	osg::ref_ptr tankNode = osgDB::readNodeFile("d:\\1.OSGB");
	root->addChild(tankNode.get());

	InfoVisitor infoVisitor;
	 if (root)
	{
		root->accept(infoVisitor);
	}
	
	//优化场景数据
	osgUtil::Optimizer optimizer;
	optimizer.optimize(root.get());

	//设置场景数据
	viewer->setSceneData(root.get());

	//初始化并创建窗口
	viewer->realize();

	//开始渲染
	viewer->run();

	return 0;

}
 

注意：上述的node.getName()即节点名称要用Utf8ToGB2312函数转换一下，否则对于中文的名称会出现乱码。运行截图如下：

参考链接：OSG节点访问和遍历 - adyzng - 博客园 (cnblogs.com)