Darboux Cyclides and Webs from Circles

H. Pottmann, L. Shi and M. Skopenkov


Motivated by potential applications in architecture, we study Darboux cyclides. These algebraic surfaces of order ≤ 4 are a superset of Dupin cyclides and quadrics, and they carry up to six real families of circles. Revisiting the classical approach to these surfaces based on the spherical model of 3D Möbius geometry, we provide computational tools for the identification of circle families on a given cyclide and for the direct design of those. In particular, we show that certain triples of circle families may be arranged as so-called hexagonal webs, and we provide a complete classification of all possible hexagonal webs of circles on Darboux cyclides.


    AUTHOR = {Pottmann, Helmut and Shi, Ling and Skopenkov, Mikhail},
     TITLE = {Darboux cyclides and webs from circles},
   JOURNAL = {Comput. Aided Geom. Design},
    VOLUME = {29},
      YEAR = {2012},
    NUMBER = {1},
     PAGES = {77--97},