It means you have quads with the vertices in "bow-tie" order, rather than clockwise or counter-clockwise order. The corrected sequence for the line below would be: 4 16 16 144 6 16 140 6 -16 140 6 -16 144 6 LDraw handles "bowties" ok, but other (...) (25 years ago, 19-Aug-99, to lugnet.cad.dev)
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