OpenSceneGraph 3.0

Time for action—loading a model at runtime

We are going to demonstrate the loading of a model file by using the osg::ProxyNode. The proxy will record the filename of the original model, and defer loading it until the viewer is running and sending corresponding requests.

1. Include the necessary headers:

   #include <osg/ProxyNode>
   #include <osgViewer/Viewer>
   

2. Instead of just loading model files as child nodes, we will set a filename to the specified index of children. This is similar to the insertChild() method, which puts a node into the specified position of the children list, but the list will not be filled until the dynamic loading process has finished.

   osg::ref_ptr<osg::ProxyNode> root = new osg::ProxyNode;
   root->setFileName( 0, "cow.osg" );
   

3. Start ...