Doesn't answer the questions I had. Is this real-time or batch rendered? Also, the site advertises it as a "computer graphics library" but many of these demos are more about physics simulation, which only adds more confusion...
You seem to be assuming that "library" must mean a layer or an API providing certain runtime abstractions or functionality. That's not really what this is. It's more about code reuse and a rationalized core of tools for implementing the various techniques.