On a New Conformal Functional for Simplicial Surfaces

摘要

We introduce a smooth quadratic conformal functional and its weighted version W_2 = Σe β~2 (e) W_2,ω = Σe (n_i + n_j) β~2 (e), where β(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 Will-more energy W this functional also minimizes local differences of the angles β. 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,ω) are inscribed poly-hedra. 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.