osg::PolygonMode 如何关闭

rubby

各位大哥，如果我用如下的方式 开启了 osg:olygonMode。

1. osg::PolygonMode* polymode = new osg::PolygonMode;
   
2.     polymode->setMode(osg::PolygonMode::FRONT_AND_BACK,osg::PolygonMode::LINE);
   
3.     stateset->setAttributeAndModes(polymode,osg::StateAttribute::OVERRIDE|osg::StateAttribute::ON);
   
4.    
   
5.         osg::Group* wireframe_subgraph = new osg::Group;
   
6.         wireframe_subgraph->setStateSet(stateset);
   
7.         wireframe_subgraph->addChild(subgraph);

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请问，如何关闭（不重新创建一个stateset,设置给wireframe_subgraph ,比如 stateset 的callback中根据一定条件关闭PloygonMode）：

感觉大致如下，获取attr后，如何关闭PolygonMode?  搜索咱们论坛，尚未发现有解决方法。   请各位大哥赐教。小弟跪谢

1. osg::StateAttribute* attr = wireframe_subgraph->getOrCreateStateSet()->getAttribute(osg::StateAttribute::POLYGONMODE);
   
2. 
   
3. .......

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rubby

自己解决了：

1.         osg::StateAttribute* attr = wireframe_subgraph->getOrCreateStateSet()->getAttribute(osg::StateAttribute::POLYGONMODE);
   
2.         osg::PolygonMode* pm = dynamic_cast<osg::PolygonMode*>(attr);
   
3.         if(!pm)
   
4.                 std::cout<<"ERROR, pm is null"<<std::endl;
   
5.         else{
   
6.                 pm->setMode(osg::PolygonMode::FRONT_AND_BACK,osg::PolygonMode::FILL);
   
7.         }

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