intersection groups

bool normalAndHot(const osg::Vec3d& position, osgViewer::CompositeViewer& viewer, osg::Vec3& normal, osg::Vec3d& hot)
{
    osgSim::LineOfSight los;

    osg::Vec3d s = position + osg::Vec3d(0, 0, 10000);
    osg::Vec3d e = position - osg::Vec3d(0, 0, 10000);
    los.addLOS(s, e);

    if (viewer.getView(0)->getSceneData())
    {
        osg::ref_ptr<osgUtil::IntersectorGroup> intersectorGroup = new osgUtil::IntersectorGroup();
        osg::ref_ptr<osgUtil::LineSegmentIntersector> intersector = new osgUtil::LineSegmentIntersector(s, e);
        intersectorGroup->addIntersector(intersector.get());

        osgUtil::IntersectionVisitor intersectVisitor(intersectorGroup.get());

        viewer.getView(0)->getSceneData()->accept(intersectVisitor);

        if (intersectorGroup->containsIntersections())
        {
            osgUtil::IntersectorGroup::Intersectors& intersectors = intersectorGroup->getIntersectors();
            for (osgUtil::IntersectorGroup::Intersectors::iterator intersector_itr = intersectors.begin();
                intersector_itr != intersectors.end();
                ++intersector_itr)
            {
                osgUtil::LineSegmentIntersector* lsi = dynamic_cast<osgUtil::LineSegmentIntersector*>(intersector_itr->get());
                if (lsi)
                {
                    osgUtil::LineSegmentIntersector::Intersections& intersections = lsi->getIntersections();
                    for (osgUtil::LineSegmentIntersector::Intersections::iterator itr = intersections.begin();
                        itr != intersections.end();
                        ++itr)
                    {
                        const osgUtil::LineSegmentIntersector::Intersection& intersection = *itr;

                        normal = intersection.getWorldIntersectNormal();
                        hot = intersection.getWorldIntersectPoint();

                        std::cout << "HOT: " << hot << std::endl;
                    }
                }
            }
        }
    }
    return false;
}