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SceneGraphObjectRetained retained

The retained field holds the private Java 3D implementation object for this SceneGraphObject. The SceneGraphObjectRetained maintains a reference to its source object and implements several setLive methods that can be overridden to respond in a Node specific manner. By having an internal delegate class separate from the public implementation class defined by the specification Sun has more leeway in modifying the implementation without breaking the API or exposing protected or package level access to methods or fields.