isosurface
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Is this `-1-1` intentional?
https://github.com/Lin20/isosurface/blob/57b5c5e16e9de321e3f4a919d2f14c85811a28e7/Isosurface/Isosurface/ManifoldDC/Utilities.cs#L518C1-L519C1
{1, 2, 4, 7, 9, 11, -2, -1, -1, -1, -1, -1-1, -1, -1, -1, -1},