Returns the inward-facing normal of the great circle passing through the edge from vertex k to vertex k+1 (mod 4). The normals returned by getEdges will be unit length.
the S2CellID
the 4 edges of the cell normalized
Returns the inward-facing normal of the great circle passing through the edge from vertex k to vertex k+1 (mod 4). The normals returned by getEdges will be unit length.