Two components of the boundary of \(\text \textbf{I}_3\). (Deux composantes du bord de \(\text \textbf{I}_3\)) An identification between invariants of \(h\) hyperplanes in \({\mathbb{P}}_ n\) and \(h\)-hedral complexes in \({\mathcal G}({\mathbb{P}}_ n{\hookrightarrow}{\mathbb{P}}({\mathbb{C}}^ h))\) 