osg::ref_ptr<osgDB::ReaderWriter::Options> options = new osgDB::ReaderWriter::Options;
options->setOptionString("Compressor=zlib"); // 设置压缩osgDB::writeNodeFile(*(node.get()), osgb_path, options);osgconv a.osg a.osgb -O Compressor=zlib
不起作用的话，添上WriteImageHint=IncludeData