Using the OSG Viewer
The Viewer tab provides one or more 3D windows into the scene described by the scene graph. Only locations that are exposed within the Scene Graph tab are represented in the Viewer - the exception being pinned locations. For more on pinning a location see Changing What is Shown in the Viewer.
You can interactively modify parameters, on some nodes contributing to a scene graph location, using Manipulators within the Viewer. The manipulators available vary depending on the scene graph location selected, and the nodes that created it. For more on this see Using Manipulators. It is also possible for additional manipulators to be implemented by your studio using the Viewer Manipulator API. Consult the developer documentation and example code for further details.
In Shaded (raw) and Shaded (filmlook) modes the Viewer uses OpenGL lights and shaders, which are distinct from the lights and shaders used for final rendering. The OpenGL lights and shaders are added to existing light and material nodes. For more on this see Assigning a Viewer Material Shader, and Assigning a Viewer Light Shader.