Just as an aside, I hadn't checked back on this recently, but "Silo" is is/was writing out rediculously bad .obj files. I think in the one I looked at, it had the above problem (lots of interspersed #usemtl lines) as well as 'v' (vertex) records for every point of every polygon (typically, 3 or more polygons share any one vertex - that's the reason for the lookup table). Of course this was a few month ago - hopefully they've improved things since then.

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