static bool writePositionList( osgDB::OutputStream& os, const osg::Billboard& node )
{
const osg::Billboard::PositionList& posList = node.getPositionList();
os.writeSize(posList.size());
os<< os.BEGIN_BRACKET << std::endl;
for ( osg::Billboard::PositionList::const_iterator itr=posList.begin();
itr!=posList.end(); ++itr )
{
os << osg::Vec3d(*itr) << std::endl;
}
os << os.END_BRACKET << std::endl;
return true;
}
static bool checkPositionList( const osg::Billboard& node )
{
return node.getPositionList().size()>0;
}