List of callbacks
There are several kinds of callbacks in the OSG scene graph and backend. Among them, the osg::NodeCallback class is an important implementer of update, event, and cull callbacks. It can be only attached to nodes. For drawables, we have osg::Drawable::UpdateCallback, osg::Drawable::EventCallback and osg::Drawable::CullCallback to achieve the same goal.
The osg::NodeCallback class has a virtual operator() method for users to override by customizing their own execution code. To make it work, we have to attach the callback object to a specific node in the scene graph with the setUpdateCallback() or addUpdateCallback() method. The operator() method will then be automatically called during the update traversal in every frame.
The following ...
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