Hi Numenus, 
 
Well actually air also support nurbs very well (reyes dicing, so you don't have to worry about meshing) ... and well, it's a renderman compliant renderer. 
But for sure it's not realtime ... 
 
So far I haven't get any success with the superior obj RenderGin import, (maybe rendergin dont support ngones ?) ... and I have to admit I don't have the 
will to beta testing stuff for the moment. Looks like I can't import nurbs either in demo mode, so it's not easy to evaluate the software ;)
 
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