osg qt three-dimensional model loads

osg::ref_ptr<osg::Node> OSG_Qt_::operateMatrix()
{
    osg::ref_ptr<osg::Group> group = new osg::Group;
    osg::ref_ptr<osg::Node> node = osgDB::readNodeFile("D:\\参考手册\\BIM\\osg\\tanker.OSGB");
    //return node;
    group->addChild(node);
    return group;
}