从modelLayer中生成要素源的时候有些值不能得到？

liaowei5566

//从modelLayer中获取到要素源
osgEarth::ModelLayerOptions mloptions = pmodelLayer->getModelLayerOptions();
osgEarth::Features::FeatureModelSourceOptions fmsoptions = mloptions.driver().get();
osg::ref_ptr<osgEarth::Features::FeatureSource> pfeatureSource = osgEarth::Features::FeatureSourceFactory::create(fmsoptions.featureOptions().get());


osgEarth::Features::FeatureSchema my = pfeatureSource->getSchema();//得不到

这是什么情况啊。谁知道？

        /**
         * Gets the FeatureSchema for this FeatureSource. If the schema doesn't
         * publish a source, this might be empty.
         */
        virtual const FeatureSchema& getSchema() const;

那么该怎么才能publish a source呢？？？？？

liaowei5566