Creation of osgearth earth files to the earth ------ osgearth rendering engine series (1)

      This article introduces the code , Explain in osgEarth in , from .earth Document to earth creation process , show osgEarth Middle concept , Such as Map、Layer as well as MapNode.

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osg::Node* node = MapNodeHelper().load(arguments, &viewer);

analysis osgEarth The creation of the middle earth , Start with the code above , among arguments Variable is osg::ArgumentParser object , Its path contains a .earth file ,viewer by osgViewer::Viewer object , Created in the above code osg::Node object , Can be set directly to viewer The scene node of the object , Implement rendering , The results are shown in the following figure ：

The next analysis load The contents of the function ：

    osg::ref_ptr<osg::Node> node = osgDB::readNodeFiles(args, myReadOptions.get());
    // fallback in case none is specified:
    if (!node.valid())