Blah, blah blah... If it's internal reflection you seek, try modeling the whole scene! Or if worse comes to worse, then just model the whole scene! Better yet, if you don't have time for any of THAT, then just MODEL THE WHOLE SCENE! Environmental image maps produce a great deal of paralactic displacement distortion in terms of reflections, and even worse, they cannot cast shadows. Contrare to popular opinion, the world actually exists! It is not just limited to spheres. If an artist is just trying to make eye-candy, or just save a lot of time, why not just take real photos instead of doing 3D imaging at all? Not trying to be negative, merely scoffing at laziness.