Good idea, geep. I can probably assign groups easily enough, but how do I make a label that wraps around a bottle into a 2-sided object? I tried doing that in Carrara by adding thickness to the label, but it just replicated the problem that the bottle had, because the bottle was already a two-surfaced spline object. However, I didn't assign separate materials to the inside surface of the label in Carrara; I don't know how to do that.