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Most efficient method of offscreen rendering

I'm wondering if someone can tell me the most efficient way to do offscreen rendering with OpenGL such that I have access to the resulting pixel buffer. In other words, I want to render a scene to a buffer and then be able to read the pixels/bytes right out of the frame.

I know I can use PBuffers to render offscreen, but I'm not sure if there's an efficient way to access the pixels that way. I think glReadPixels() would work, but that seems like a slow way to do it since it would be copying the scene each frame. There seem to be ways to make OpenGL render into my own buffer, but I don't know if that's slower in any way, so I'm looking for suggestions for the best method.

Thanks,

-Brian



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