Im about to take on the monumental task of designing a unfolding application. The trick is Im using the XGL format, something Rhino 3.0 exports. Its a very simple xml format that supports mesh, object, texture data. Im curious how many of you use Rhinoceros (especially 3.0, older versions might not support XGL exports) or if any other 3d modelling application supports it. If not I'll try dxf, but either dxf doesnt handle multiple objects, or maybe rhino's exporter doesn't get it right..not sure.