We are glad to announce two upcoming talks given by Yoshiki Jikumaru and Andreas Fabri in the Oberseminar "Geometrie und Visualisierung" (Geometry and Visualization).

1.) Title
Anisotropic energy descent and Minkowski-type formula for discrete surfaces

Date, Time and Place
11.09.2025, 4:15 pm, Arnimallee 6 - Room 108/109

Abstract

In architectural surface design, it is important to establish design methods for surfaces with "anisotropy" for the "ideal lighting". In this talk, we show a shape generation method for "orientation-based area distribution" via anisotropic energy descent for triangulated surfaces. Moreover, we discuss so-called the Minkowski-type formula for discrete setting, which holds for stationary surfaces of the energy.

This talk is based on the joint work with Kentaro Hayakawa (Nihon Univ.), Kazuki Hayashi (Kyoto Univ.), Miyuki Koiso (Kyushu Univ.) and Shun Kumagai (Hachinohe Institute of Technology).

2.) Title
CGAL – The Computational Geometry Algorithms Library

Date, Time and Place
11.09.2025, 5:00 pm, Arnimallee 6 - Room 108/109

Abstract

The CGAL Project began in 1996 as part of the European FP4 Esprit program. Nearly thirty years later, it continues to be actively developed and widely used, and in 2023 it was recognized with the SoCG Test of Time Award. At its core, CGAL is a C++ library offering a broad range of geometric algorithms and data structures.

This talk does not focus on scientific results, technical details, or commercial aspects. Instead, it will address organizational aspects of the CGAL Open Source Project: the reasoning behind license choices, the evolution of development infrastructure, the challenges of sustaining a long-term project, efforts to attract new contributors, and the role of GeometryFactory as a non-academic partner.