OSG 将模型坐标移至原点

OSG 将模型坐标移至0点，并保存

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前言：好久没时间写博客了，更别说是OSG相关了，今天由于需要处理模型，发现导入的模型都自带坐标，就写个批处理。

问题

原始模型自带坐标，将模型坐标移至原点。

步骤

1. 首先得到模型Center
2. 将模型加入MatrixTransform节点中，设置平移距离为-Center
3. 将MatrixTransform转成Node节点保存

示例代码

#include 
#include 
#include  
#include 
#include 
#include 
#include 
#include 
int main()
{
	osg::ref_ptr<osgViewer::Viewer> viewer = new osgViewer::Viewer();
	viewer->setUpViewInWindow(100, 100, 1080, 960);
 	osg::ref_ptr<osg::Group> root = new osg::Group();
	
  	std::string readPath = "ChineseChess/";
  	std::string writePath = "NewChineseChess/";
  	osg::ref_ptr<osg::Node> chess = osgDB::readNodeFile(readPath + "readModel.ive");
 	if (chess.valid()) {
 		osg::Vec3 chessCenter = chess->getBound().center();
 		osg::ref_ptr<osg::MatrixTransform> mt = new osg::MatrixTransform();
 		mt->setMatrix(osg::Matrix::translate(-chessCenter));
 		mt->addChild(chess);
 		chess = mt->asNode();
 	}
 	osgDB::writeNodeFile(*chess, writePath + "writeModel.ive");
 	
	viewer->setSceneData(root.get());
	viewer->realize();
	viewer->run();
	return 0;
}