osgGA::KeySwitchMatrixManipulator 漫游切换器

//演示申请键盘操作切换操作器
    osg::ref_ptr keySwitch = new osgGA::KeySwitchMatrixManipulator;
    osgGA::KeySwitchMatrixManipulator* keyswitchManipulator;
    keyswitchManipulator = new osgGA::KeySwitchMatrixManipulator;
  keyswitchManipulator->addMatrixManipulator('1', "Trackball",
        new osgGA::TrackballManipulator);
    keyswitchManipulator->addMatrixManipulator('2', "Flight",
        new osgGA::FlightManipulator);
    keyswitchManipulator->addMatrixManipulator('3', "Drive",
        new osgGA::DriveManipulator);
    keyswitchManipulator->addMatrixManipulator('4', "Terrain",
        new osgGA::TerrainManipulator);

注意：默认使用的是按代码执行顺序第一个漫游器 keyswitchManipulator->addMatrixManipulator('1', "Trackball",
new osgGA::TrackballManipulator);,所以当你想要实现启动第一个漫游器的时候，请注意代码顺序。