osg之矩阵（一）

讲解一些旋转矩阵

osg::ref_ptr<osg::Node> MatrixOperation()
{
    osg::ref_ptr<osg::Group> group=new osg::Group;
    osg::ref_ptr<osg::MatrixTransform> max=new osg::MatrixTransform;
    osg::ref_ptr<osg::Node> node=osgDB::readNodeFile("glider.osg");
    osg::ref_ptr<osg::MatrixTransform> max2=new osg::MatrixTransform;

    max2->addChild(node);
    max2->setMatrix(osg::Matrix::translate(5.0,0.0,0.0));
    max->addChild(max2);
    max->setUpdateCallback(new osg::AnimationPathCallback(osg::Vec3(0.0,0.0,0.0),osg::Z_AXIS,1.0));

    group->addChild(node);
    group->addChild(max);
    return group;
}

int main()
{
    osg::ref_ptr<osgViewer::Viewer> viewer=new osgViewer::Viewer;
    osg::ref_ptr<osg::Group> group=new osg::Group;
    viewer->setSceneData(MatrixOperation());
    return viewer->run();
}

思考：为什么要建立两个osg::MatrixTransform而不是建立一个。如何仅仅建立一个osg::MatrixTransform会是什么样的效果

osg::ref_ptr<osg::MatrixTransform> max=new osg::MatrixTransform;
max->addChild(node);
max->setMatrix(osg::Matrix::translate(5.0,0.0,0.0));
max->setUpdateCallback(new osg::AnimationPathCallback(osg::Vec3(0.0,0.0,0.0),osg::Z_AXIS,1.0));

就像上面这样会是什么样的效果？