On a New Conformal Functional for Simplicial Surfaces

  • Alexander I. BobenkoEmail author
  • Martin P. Weidner
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 9213)


We introduce a smooth quadratic conformal functional and its weighted version
$$W_2=\sum _e \beta ^2(e)\quad W_{2,w}=\sum _e (n_i+n_j)\beta ^2(e),$$
where \(\beta (e)\) is the extrinsic intersection angle of the circumcircles of the triangles of the mesh sharing the edge \(e=(ij)\) and \(n_i\) is the valence of vertex i. Besides minimizing the squared local conformal discrete Willmore energy W this functional also minimizes local differences of the angles \(\beta \). We investigate the minimizers of this functionals for simplicial spheres and simplicial surfaces of nontrivial topology. Several remarkable facts are observed. In particular for most of randomly generated simplicial polyhedra the minimizers of \(W_2\) and \(W_{2,w}\) are inscribed polyhedra. We demonstrate also some applications in geometry processing, for example, a conformal deformation of surfaces to the round sphere. A partial theoretical explanation through quadratic optimization theory of some observed phenomena is presented.


Delaunay Triangulation Intersection Angle Round Sphere Minimal Realization Simplicial Surface 
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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  1. 1.Institut Für MathematikTechnische Universität BerlinBerlinGermany

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