osg::ref_ptr<osg::StateSet> state = root->getOrCreateStateSet();
state->setMode(GL_LIGHTING, osg::StateAttribute::ON);
state->setMode(GL_LIGHTING, osg::StateAttribute::OFF);
osg::ref_ptr<osg::StateSet> state = root->getOrCreateStateSet();
state->setMode(GL_LIGHTING, osg::StateAttribute::ON);
state->setMode(GL_LIGHTING, osg::StateAttribute::OFF);