Standard wrapper APIs for 3D scenegraphs?

There are umpteen APIs for traversing a 3D scene. Many of them proprietary and oriented toward particular hardware or a particular 3D graphics application.

I'm thinking of APIs for Max, Maya, OpenGL, Direct3D, RenderWare, Open Inventor, etc.

Has anyone (perhaps with a view to making a game or tool portable across 3D APIs) abstracted one or more of these APIs into a wrapper that isolates the game/tool code from the proprietary 3D API?

I know I have. However, I'm wondering if anyone knows of a de facto 'rolls-royce' of 3D API abstractions that supports a variety of existing APIs and is designed to be easy to customise to support any number of additional 3D APIs?

Such a wrapper would enable iteration over a 3D scene graph, the ability to extract any amount of 3D information (depending upon its availability) and make modifications to any part of it.

I'm just asking this, just in case it's already been done and I don't have to do it (cos I'm about to).

I know one could take any existing API of one's choice and then simply use that as the basis for a wrapper around any other API, however, I'm wondering if someone has specifically created an API carefully designed to make wrapping other APIs easy.

I'm hoping someone will say "Sure. You want to check out the Universal 3D API wrapper project at www.universal3d.org" or something like that. ;-)



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