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No sections?. I suppose that the DX exporter throws away the points because the DX model definition doesn't support point grouping itself...(?).
Do you really need the vertex list to be grouped?. Couldn't you divide the fish model into more that one object? i.e.: head, body, tailor, fins. I suposse you need the groups for animation purposes (?).
Sincerely,
Sergio.
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