Creation and content of mapnode -- osgearth rendering engine series (2)

        At the time of this article osgEarth earth File to earth creation ---(1) On the basis of , Further explanation MapNode The creation process of .

        This article introduces the code , Explain in osgEarth in ,MapNode And MapNode Child nodes and traverse The contents of the function .

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Content

osg::Node*
EarthFileSerializer2::deserialize( 
    const Config& const_conf, 
    const std::string& referrer,
    const osgDB::Options* readOptions) const
{
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    MapNode::Options mapNodeOptions( conf.child("options") );
    // Create a map node.
    osg::ref_ptr<MapNode> mapNode = new MapNode( map.get(), mapNodeOptions );
    // Apply the external conf if there is one.
    if (!externalConfig.empty())
    {
        mapNode->externalConfig() = externalConfig;
    }
    // Install the extensions
    for (unsigned i = 0; i < extensions.size(); ++i)
    {
        mapNode->addExtension(extensions[i].get());
    }
    // return the topmost parent of the mapnode. It'