void MyCullVisitor::apply(osg::LightSource& node)
{

    osg::Matrixd inverseViewMatrix = osg::Matrixd::inverse(getCurrentCamera()->getViewMatrix());
    osg::Matrixd worldMatrix = inverseViewMatrix * (*getModelViewMatrix());

    osg::Vec3d pos(node.getLight()->getPosition().x(), node.getLight()->getPosition().y(), node.getLight()->getPosition().z());
    worldMatrix = osg::Matrixd::translate(pos) * worldMatrix;

    node.setUserValue("WorldMatrix", worldMatrix);
    if (node.getLight()->getLightNum() == 0)
    {
        osgUtil::CullVisitor::apply(node);
    }
}