Papers by Alexander Schiftner
These author guidelines take care of two things: (i) Reviewers should be able to process all subm... more These author guidelines take care of two things: (i) Reviewers should be able to process all submissions in more or less the same way, and they should get an impression on how a paper will look in print. (ii) The accepted papers must be typeset in the same style, and must not contain low quality graphics. The submitters are kindly
While triangulation is the easiest way of segmenting a freeform surface such that it can be built... more While triangulation is the easiest way of segmenting a freeform surface such that it can be built by using planar panels, Planar Quadrilateral Meshes ('PQ-meshes') o er much more:
Advances in Architectural Geometry 2010, 2010
Rationalization of architectural freeform structures using planar quadrilateral (PQ) meshes has r... more Rationalization of architectural freeform structures using planar quadrilateral (PQ) meshes has received rising interest in recent years, facilitated mainly by the introduction of algorithms which are capable of generating such. These algorithms involve an optimization which is, up to now, motivated purely geometrically and accounts for aspects of feasibility, visual appearance, and approximation of the architectural design. Practitioners would wish to add stiffness to the objectives of the layout process. This paper presents a simple but effective statics-aware initialization procedure for the layout of PQ meshes approximating a given freeform surface. We focus on the class of surface structures with membrane-like load bearing behavior, quite regularly encountered in architecture. By compliance analysis of two representative examples, we demonstrate that this specific type of initialization has indeed favorable impact on the mechanical properties of the final PQ mesh.
Proceedings of the 2008 ACM symposium on Solid and physical modeling - SPM '08, 2008
This article shows to which extent a particular field of mathematics, namely discrete differentia... more This article shows to which extent a particular field of mathematics, namely discrete differential geometry, has recently become relevant in architectural design. It is very interesting that new mathematics has emerged from this cooperation with a branch of knowledge hitherto not known for its use of mathematical methods.
Advances in Architectural Geometry 2010, 2010
Paneling an architectural freeform surface refers to an approximation of the design surface by a ... more Paneling an architectural freeform surface refers to an approximation of the design surface by a set of panels that can be manufactured using a selected technology at a reasonable cost, while respecting the design intent and achieving the desired aesthetic quality of panel layout and surface smoothness. Eigensatz and co-workers [Eigensatz et al. 2010] have recently introduced a computational solution
Computer Graphics Forum, 2010
ACM Transactions on Graphics, 2009
Inspired by freeform designs in architecture which involve circles and spheres, we introduce a ne... more Inspired by freeform designs in architecture which involve circles and spheres, we introduce a new kind of triangle mesh whose faces' incircles form a packing. As it turns out, such meshes have a rich geometry and allow us to cover surfaces with circle patterns, sphere packings, approximate circle packings, hexagonal meshes which carry a torsion-free support structure, hybrid tri-hex meshes,
ACM Transactions on Graphics, 2010
Mark Pauly EPFL reuse of fabrication molds plane cylinder paraboloid torus cubic panel types iden... more Mark Pauly EPFL reuse of fabrication molds plane cylinder paraboloid torus cubic panel types identical torus molds identical cylinder molds Figure 1: Rationalization of large-scale architectural freeform surfaces with planar, single-, and double-curved panels. Our algorithm computes a paneling solution that meets prescribed thresholds on positional and normal continuity, while minimizing total production cost. Reuse of molds (left) and predominant use of simple panels (right) are important drivers of the optimization. (Left: Zaha Hadid Architects,
ACM Transactions on Graphics, 2008
Motivated by applications in architecture and manufacturing, we discuss the problem of covering a... more Motivated by applications in architecture and manufacturing, we discuss the problem of covering a freeform surface by single curved panels. This leads to the new concept of semi-discrete surface representation, which constitutes a link between smooth and discrete surfaces. The basic entity we are working with is the developable strip model. It is the semi-discrete equivalent of a quad mesh with planar faces, or a conjugate parametrization of a smooth surface. We present a B-spline based optimization framework for efficient computing with D-strip models. In particular we study conical and circular models, which semi-discretize the network of principal curvature lines, and which enjoy elegant geometric properties. Together with geodesic models and cylindrical models they offer a rich source of solutions for surface panelization problems.
ACM Transactions on Graphics, 2010
: Geodesic patterns on freeform surfaces. Left: For the cladding of a surface by wooden panels be... more : Geodesic patterns on freeform surfaces. Left: For the cladding of a surface by wooden panels bendable only about their weak axis, we perform segmentation into parts which can be covered by geodesic strips of roughly constant width. Right: A timber construction derived from a hexagonal geodesic web has good manufacturing and statics properties.
Advances in Architectural Geometry 2010, 2010
This paper shows design studies with bent panels which are originally rectangular or at least app... more This paper shows design studies with bent panels which are originally rectangular or at least approximately rectangular. Based on recent results obtained in the geometry processing community, we algorithmically approach the questions of an exact rectangular shape of panels; of watertightness of the resulting paneling; and of the panel shapes being achievable by pure bending. We conclude the paper with an analysis of stress and strain in bent and twisted panels.
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Papers by Alexander Schiftner