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I remember reading somewhere that the original character models were made as NURBS, which also would not be easy to work with for a game engine.
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Only some things were made with NURBs. I recall that the Ratz were modelled with NURBs and the dev article about it pointed out that that was unusual. Also, I seem to recall that the design was done in NURBs, but they were converted to polygons before being used.