Added alpha test setting
Added alpha test setting


artoolkit/osg,stmh/osg,XiaoCC/osg,stmh/osg,artoolkit/osg,koshman86/osg,ntoand/osg,XiaoCC/osg,omega-hub/osg,XiaoCC/osg,ghub/osg,XiaoCC/osg,koshman86/osg,XiaoCC/osg,omega-hub/osg,stmh/osg,ntoand/osg,ghub/osg,ghub/osg,ntoand/osg,ntoand/osg,ghub/osg,artoolkit/osg,stmh/osg,omega-hub/osg,artoolkit/osg,koshman86/osg,omega-hub/osg,stmh/osg,koshman86/osg