Motivations

Performance

Productivity

Portability

Interoperability

Extensibility

Scalability

Source

Community

Extensibility - if it ain't there add it (easily)

• Core scene graph


• Nodes - via subclassing or app & cull callbacks to add new behaviours or structure to the internal graph


• Drawable leaves - via subclassing or app, cull & draw callbacks to encapsulate OpenGL primitive drawing


• StateAttributes - via subclassing to encapsulate OpenGL state extensions


• User Data - All osg::Object's can have UserData associated with them



• Traversers & Visitors - very easy to add new operations on the scene graph and objects contained within it - Visitor Design Pattern!



• Node Kits - allow runtime extension of the scene graph.



• Plugins - add your own readers and writers without modifying the core applications.