The SharpGL graphics library is a C# wrapper of OpenGL. However, it is also a fully object orientated Scene Graph.
Programming 3D games and applications is made a lot more straightforward with SharpGL, it's framework is very extensible and simple to work with, and all of the sourcecode is free to download and use in applications, even commercial ones.
SharpGL is continually being updated, to see what sort of things you can do with it, try downloading some of the demo applications, some of which are designed to show of the graphics features, such as real time shadows, and some which are designed to expose the SharpGL Scene Graph framework itself.
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