When not properly arranged, triangular meshes present edges that are too short or too long (image above). In the first case the structure is overwhelming and eventually limits the light permeability through the glazing. In the latter the longer spans cannot be achieved as the structural stress is to high. An efficiency-driven strategy is applied to the geometry in order to equalize the lengths of all the edges (image below). Triangles are then divided into families with identical characteristics, when possible (top image). The cost of fabrication of straight elements and triangular panels is reduced as much as the structural efficiency is increased.