A .neigh file associates with each tetrahedron its neighbors (adjacent
tetrahedra), which are indices into the corresponding .ele file. An
index of -1 indicates no neighbor (because the tetrahedron is on a
boundary of mesh domain). The first neighbor of tetrahedron i is
opposite the first corner of tetrahedron i, and so on. It is output
by TetGen when -n switch is used.
- First line: <# of tetrahedra> <# of nei. per tet (always 4) >
- Remaining lines list of # of neighbors:
<tetrahedron #> <neighbor1> <neighbor2> <neighbor3> <neighbor4>
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