- OpenSceneGraph 3.0: Beginner's Guide
- Rui Wang Xuelei Qian
- 168字
- 2021-03-27 00:35:41
Time for action—improving the "Hello World" example
The included headers, <osgDB/ReadFile> and <osgViewer/Viewer>, do not need to be modified. We only add a root variable that provides the runtime access to the Cessna model and assigns it to the setSceneData() method.
- In the main entry, record the Cessna model with a variable named
root:osg::ref_ptr<osg::Node> root = osgDB::readNodeFile("cessna.osg"); osgViewer::Viewer viewer; viewer.setSceneData( root.get() ); return viewer.run(); - Build and run it at once:
- You will see no difference between this example and the previous "Hello World". So what actually happened?
What just happened?
In this example, we introduced two new OSG classes: osg::ref_ptr<> and osg::Node. The osg::Node class represents the basic element of a scene graph. The variable root stands for the root node of a Cessna model, which is used as the scene data to be visualized.
Meanwhile, an instance of the osg::ref_ptr<> class template is created to manage the node object. It is a smart pointer, which provides additional features for the purpose of efficient memory management.
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