Conclusions regarding mesh design. A fundamental question is to find a “smooth” triangulation of a given reference surface. The previous paragraphs give guidance for the combinatorially regular case with 6 edges per vertex: In the negatively curved regions of the reference surface, the positioning of edges must take the asymptotic directions into account. According to Observation 2, in each quadrant bounded by asymptotic directions we may place 1 or 2 edges, but not 3.