Return connectivity information for a logically-rectangular set of points.

Some of the nodes returned here aren’t actually connected in the sense of having an edge between them, but they are diagonally-opposite points on a common quad. If they are left out, then not all the outermost nodes will be identified in find_external_points().

Parameters:¶

points: SliceCoords¶

The locations of the points, stored in 2-dimensional arrays.