Fig 9. Bridge building principle with triangulation.

Green crosses mark the corner of the ring element's plane side. To each baseline point (green points) a rectangle (light blue lines) is constructed. Rectangle triangulation, spanned by the two starting nodes (N1 and N2) and two opposing nodes of the previous constructed rectangle (N3 and N4). Node N1, N3 and N4 build a triangle T2, and Nodes N1, N2 and N3 build the second triangle T1.