為何 osg::PolygonMode::FRONT 与 osg::PolygonMode::FRONT_AND_BACK 显示效果一样?

superwavelet

1.         osg::ref_ptr<osg::PolygonMode> pm = new osg::PolygonMode;
   
2.         pm->setMode(osg::PolygonMode::FRONT_AND_BACK, osg::PolygonMode::FILL);
   
3.         geometry->getOrCreateStateSet()->setAttribute( pm.get());

复制代码

如果把 FRONT_AND_BACK 改为:  FRONT 背面显示效果为什么还是一样?
osg 的PolygonMode的FRONT_AND_BACK  就是封装的 glCullFace(FRONT_AND_BACK) 函数吗?

array

PolygonMode对应的是glPolygonMode
CullFace对应的才是glCullFace