Bones
Exciting. I have a skeleton exported. The next phase is getting the animations out, playback, and then combining that with the skinning information which has yet to be exported.
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To give you an idea of how many polygons are involved:

Originally, I had used a 1x1x4 cube split into 32x32x32 segments. That quickly turned out to be a bad idea. The final split is 16x16x16.