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arXiv 1005.2698math.GTmath.DG
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离散共形映射与理想双曲多面体

Discrete conformal maps and ideal hyperbolic polyhedra

Alexander Bobenko, Ulrich Pinkall, Boris Springborn

摘要:

我们建立了两个以前不相关的主题之间的连接:一个特定的离散版本的共形几何的三角曲面,和几何的理想多面体在双曲三维空间。如果两个三角化曲面的边长与顶点的比例因子有关,则两个三角化曲面被认为是离散共形等价的。这个简单的定义导致了一个令人惊讶的丰富的理论具有莫比乌斯不变性,定义离散保形映射作为外接圆保持分段投影映射,和两个变分原理。我们展示了如何从字面上相同的理论可以重新解释,以解决建设一个理想的双曲多面体规定的内在度量的问题。这种合成使我们能够推导出双曲三角剖分的离散共形映射的伴随理论。它还表明,这里考虑的离散保形性的定义是密切相关的离散保形性的圆包装方面的既定定义。

英文摘要:

We establish a connection between two previously unrelated topics: a particular discrete version of conformal geometry for triangulated surfaces, and the geometry of ideal polyhedra in hyperbolic three-space. Two triangulated surfaces are considered discretely conformally equivalent if the edge lengths are related by scale factors associated with the vertices. This simple definition leads to a surprisingly rich theory featuring Möbius invariance, the definition of discrete conformal maps as circumcircle preserving piecewise projective maps, and two variational principles. We show how literally the same theory can be reinterpreted to addresses the problem of constructing an ideal hyperbolic polyhedron with prescribed intrinsic metric. This synthesis enables us to derive a companion theory of discrete conformal maps for hyperbolic triangulations. It also shows how the definitions of discrete conformality considered here are closely related to the established definition of discrete conformality in terms of circle packings.

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