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SPM 2018
P R OGR A M GU I D E w p . b c a m a t h . o r g / s p m 2 0 1 8
JU
NE
11
-13
, 2
01
8
International Symposium on Solid and Physical Modeling
June
11-13
| Bizk
aia Ar
etoa
, Bilb
ao (S
pain)
CONTENT
Organizers
Program Committee
Program
Keynotes
Conference Venue
Bézier Award Winner
1
2
4
7
11
14
CONTENTOrganizers
Program Committee
Program
Keynotes
Conference Venue
Bézier Award Winner
2
3
5
8
11
13
ORGA
NIZE
RS
CONFERENCE CHAIRSMichael BartonBCAMGershon ElberTechnionHelmut PottmannTU Wien
PROGRAM CHAIRSJessica ZhangCarnegie Mellon UniversityTakashi MaekawaYokohama National UniversityJohannes WallnerTU Graz
2
INTE
RNAT
IONA
L PRO
GRAM
COM
MITT
EENina Amenta
Michael Barton
Carolina Beccari
Dominique Bechmann
Dobrina Boltcheva
Georges-Pierre Bonneau
Mario Botsch
Wim Bronsvoort
Frédéric Cazals
Raphaelle Chaine
Elaine Cohen
Frédéric Cordier
Chongyang Deng
Jiansong Deng
Tamal Dey
Tor Dokken
Gershon Elber
Shuming Gao
Dan Gonsor
Craig Gotsman
University of California, Davis, USA
Basque Center for Applied Mathematics, Spain
Universitá di Bologna, Italy
Université de Strasbourg, France
Inria Nancy, France
Grenoble Universités, France
Bielefeld University, Germany
Delft University of Technology, Netherlands
Inria Sophia Antipolis, France
University of Lyon, France
University of Utah, USA
Université de Haute, France
Hangzhou Dianzi University, China
University of Science and Technology, China
Ohio State University, USA
SINTEF, Norway
Technion, Israel
Zhejiang University, China
Boeing, USA
Technion, Israel
Xiaohu Guo
Stefanie Hahmann
Dianne Hansford
John Hart
Ying He
Martin Hering-Bertram
Kai Hormann
Zhangjin Huang
Insung Ihm
Horea Ilies
Ravi Janardan
Robert Joan-Arinyo
Tao Ju
Bert Jüttler
John Keyser
Myung-Soo Kim
Tae-Wan Kim
Jiri Kosinka
Adarsh Krishnamurthy
Yu-Kun Lai
University of Texas, USA
University of Grenoble, France
Arizona State University, USA
University of Illinois, USA
Nanyang Technological University, Singapore
Bremen University, Germany
Universitá della Svizzera italiana, Switzerland
University of Science and Technology, China
Sogang University, South Korea
University of Connecticut, USA
University of Minnesota, USA
Universitat Politecnica de Catalunya, Spain
Washington University, USA
Johannes Kepler University, Austria
Texas A&M University, USA
Seoul National University, South Korea
Seoul National University, South Korea
University of Groningen, Netherlands
Iowa State University, USA
Cardiff University, UK
3
INTE
RNAT
IONA
L PRO
GRAM
COM
MITT
EE
Jean-Claude Leon
Bruno Lévy
Xin Li
Jyh-Ming Lien
Hongwei Lin
Ligang Liu
Yong-Jin Liu
Weiyin Ma
Stephen Mann
Dinesh Manocha
Josiah Manson
Sara McMains
Niloy Mitra
Przemyslaw Musialski
Saigopal Nelaturi
Yutaka Ohtake
Daniele Panozzo
Jörg Peters
Konrad Polthier
Helmut Pottmann
Grenoble Institute of Technology, France
Inria Nancy, France
Louisiana State University, USA
George Mason University, USA
Zhejiang University, China
University of Science and Technology, China
Tsinghua University, China
City University of Hong Kong, China
University of Waterloo, Canada
University of North Carolina, USA
Activision, USA
University of California, Berkeley, USA
University College London, UK
TU Wien, Austria
Xerox PARC, USA
University of Tokyo, Japan
New York University, USA
University of Florida, USA
Freie Universität Berlin, Germany
TU Wien, Austria
Hong Qin
Ramanathan Muthuganapathy
Bill Regli
Richard Riesenfeld
Damien Rohmer
Jarek Rossignac
Nickolas Sapidis
Scott Schaefer
Hiromasa Suzuki
Georg Umlauf
Charlie Wang
Jun Wang
Wenping Wang
Gang Xu
Dongming Yan
Jianmin Zheng
Stony Brook University, USA
IIT Madras, India
University of Maryland, USA
University of Utah, USA
CPE Lyon, France
Georgia Institute of Technology, USA
University of Western Macedonia, Greece
Texas A&M University, USA
University of Tokyo, Japan
Konstanz University, Germany
Delft University of Technology, Netherlands
Nanjing University, China
Hong Kong University, China
Hangzhou Dianzi University, China
University of Science and Technology, China
Nanyang Technological University, Singapore
4
MONDAY, JUNE 11
5
6
TUESDAY, JUNE 12
7
WEDNESDAY, JUNE 13
KEYNOTES
Kai HormannUSI Lugano & NTU Singaporehttp://www.inf.usi.ch/hormann/
Kai Hormann is a full professor in the Faculty of Informatics at USI Lugano and currently a visiting professor at NTU Singapore. He received a Ph.D. in computer science from the University of Erlangen-Nüremberg in 2002 and spent two years as a postdoctoral research fellow at Caltech in Pasadena and the CNR in Pisa, before joining Clausthal University of Technology as an assistant professor in 2004. During the winter term 2007/2008 he visited Freie Universität Berlin as a BMS substitute professor and came to Lugano as an associate professor in 2009.
His research interests are focussed on the mathematical foundations of geometry processing algorithms as well as their applications in computer graphics and related fields. In particular, he is working on generalized barycentric coordinates, subdivision of curves and surfaces, barycen-tric rational interpolation, and dynamic geometry processing.
Professor Hormann has published over 70 papers in the professional literature and is an associa-te editor of Computer Aided Geometric Design, Computers & Graphics, and the Dolomites Research Notes on Approximation.
Generalized Barycentric Coordinates
In 1827, August Ferdinand Möbius published his seminal work on the ”Barycentric Calculus”, which provides a novel approach to analytic geometry. One key element in his work is the idea of barycentric coordinates which allow to write any point inside a triangle as a unique convex combination of the triangle’s vertices. These triangular barycentric coordinates are linear and possess the Lagrange property, and are therefore commonly used to linearly interpolate values given at the vertices of a triangle. Möbius also noticed that this construction extends nicely to linear interpolation of data given at the vertices of a d-dimensional simplex, and by giving up positivity of the coordinates, we can even extrapolate the data to every point in d dimensions. While barycentric coordinates are unique for simplices, they can be generalized in several ways to arbitrary polygons and polytopes in higher dimensions, and over the past few years, a number of recipes for such generalized barycentric coordinates have been developed. As they are usually given in closed form and can be evaluated efficiently, they have many useful applica-tions, e.g. in computer graphics, computer-aided geometric design, and finite element computa-tions.
8
KEYNOTES
Leif KobbeltRWTH Aachen Universityhttps://www.graphics.rwth-aachen.de/person/3/
Leif Kobbelt is a full professor for Computer Science with a specialization in Computer Graphics. Since 2001 he is the head of the Institute for Computer Graphics and Multimedia at RWTH Aachen University. After receiving his diploma in 1992 and his PhD in 1994 in Computer Science from the Karlsruhe Institute of Technology he worked at the University of Wisconsin-Madison, the University of Erlangen-Nüremberg and the Max Planck Institute of Computer Science before he moved to RWTH Aachen University in 2001. Here he built up an internationally renowned research group which eventually led to the foundation of the Visual Computing Institute at RWTH in 2015.
His research interests include 3D reconstruction, efficient geometry processing, real-time rendering, digital fabrication and multi-media applications. Leif Kobbelt published a substantial number of influential papers in international top-conferences and journals. For his research, he was awarded with the Eurographics Outstanding Technical Contribution Award 2004, two Günther Enderle Awards (in 1999 and 2012), ERC Advanced Grant 2013, and the Gottfried Wilhelm Leibniz Prize in 2014. He was nominated as a Fellow of the Eurographics Association (2008) and as a Distinguished Professor of RWTH Aachen University (2013). In 2015 he became a member of the Academia Europaea and in 2016 a member of the North Rhine-Westphalian Academy of Sciences, Humanities and the Arts.
Quad Partitioning of Freeform Surfaces
In design and engineering, quadrilateral decompositions of freeform surfaces are of high interest due to their good alignment properties to surface features. Conceptually there are two possible approaches, the bottom-up quad meshing and the top-down quad layouting, with quad meshing putting a stronger emphasis on the shape quality of individual facets while quad layouting also considering the global structure of the partitioning.
With the establishment of parametrization-based quad meshing, major advances have been achie-ved in this area. Such methods formulate the quad meshing task as a constraint mixed-integer optimization problem and make it possible to create high-quality quad meshes either fully automa-tically or interactively controlled by the user. We identify a set of desirable control operators and demonstrate how to implement them within an interactive quad meshing framework.
The global consistency requirements for quad meshes make it challenging to take anisotropy into account. Hence, adaptive refinement schemes for quad meshes are desirable which minimize the complexity as well as the irregularity of the resulting mesh.
9
of Mechanical and Automation Engineering at the Chinese University of Hong Kong (CUHK), where he started his academic career in 2003. He received a B.Eng. degree (1998) in mechatronics enginee-ring from Huazhong University of Science and Technology and his M.Phil (2000) and Ph.D. (2002) degrees in mechanical engineering from Hong Kong University of Science and Technology (HKUST). Prof. Wang received a few awards from professional societies including the ASME CIE Excellence in Research Award (2016), the ASME CIE Young Engineer Award (2009), the Best Paper Awards of ASME CIE Conferences (twice in 2008 and 2001, respectively), the Prakash Krishnaswami CAPPD Best Paper Award of ASME CIE Conference (2011), and the NAMRI/SME Outstanding Paper Award (2013). He serves on the editorial board of a few journals, including Computer-Aided Design, IEEE Transac-tions on Automation Science and Engineering, and ASME Journal of Computing and Information Science in Engineering. He is a Fellow of American Society of Mechanical Engineers (ASME). His current research interests span geometric computing, computational design, advanced manufactu-ring, and robotics.
Battles with Overhangs in 3D Printing
Called 3D printing, the process of Additive manufacturing (AM) in most commercial systems is however taken in a 2.5D manner - materials are accumulated layer upon layer in planes along a fixed printing direction. Overhanging regions are generally fabricated by inserting supporting structures, which are difficult to remove. This talk covers the techniques recently developed for overcoming this challenge in 3D printing. First of all, the method for determining an optimal printing direction is introduced. Our framework for computing an optimized 3D printing direction is formula-ted as a combination of metrics including area of support, visual saliency, preferred viewpoint and smoothness preservation. A training-and-learning methodology is developed to obtain a closed-form solution for our perceptual model. Secondly, motivated by a work of orientation-driven shape optimizer attempting to slim down the need of support, rotations have been introduced to handle overhangs. A solid decomposition based approach is applied to segment a model into sub-regions that are printed along different (but fixed) directions in a support-free way. Lastly, a more advanced hardware with continuous multi-axis motions (e.g., a robotic arm) can be utilized for 3D printing along more complicated tool-paths - i.e., a real 3D printing process. Automatic tool-path planning for multi-axis 3D printing is based on two successive decompositions, first volume-to-surfaces and then surfaces-to-curves. Details of this technique and its potential in a variety of applications will be presented at the end of this talk.
Charlie WangTU Delfthttp://homepage.tudelft.nl/h05k3/
Charlie C.L. Wang is currently a Professor and Chair of Advanced Manufacturing in the Department of Design Engineering at Delft University of Technology, The Netherlands. Prior to this position, he was a Full Professor/Associate Professor/Assistant Professor
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// C
ON
FER
ENC
E
VEN
UE
BIZKAIA ARETOA // Avenida Abandoibarra, 3
IBERDROLA TOWER // Lunches Euskadi Plaza, 5
HOTEL DOMINE // Mazarredo, 61
BCAM // Mazarredo, 14
HOTEL ABANDO // Colón de Larrategui, 9
HOTEL CARLTON // Moyua Plaza, 2
AIRPORT BUS STOP // nr. 3247 Moyua Plaza, 3 + Alameda Recalde, 11
11
ARRIAGA SAGARDOTEGIA // Dinner
Andra Maria Kalea, 13 (Casco Viejo)
TOURISM IN BILBAO
The conference dinner will take place in
Arriaga Sagardotegia, which is a restaurant
known for typical Basque cuisine and
traditional Basque cider (”Sidra” = Cider). The
restaurant is located in the heart of Casco
Viejo, the Old Town of Bilbao.
This area is especially known for its multiple
shops, bars and restaurants, and interesting
buildings such as the Cathedral of Santiago or
the Bidebarrieta library.
OLD TOWN Metro stop: Casco Viejo
GUGGENHEIM MUSEUMAvenida Abandoibarra, 2
Bilbao, with the Guggenheim Museum as a great international symbol, is the gateway to the Basque
cultural universe. It is a city that is an example of urban transformation at a global level and has
maintained a number of hallmarks that make it unique.
Here are some of the most interesting attractions the city offers:
FINE ARTS MUSEUM Plaza del Museo, 2
AZKUNA ZENTROA Plaza Arriquíbar, 4
SAN MAMES STADIUM Rafael Moreno Pitxitxi
12
Helmut PottmannTU Wienhttps://www.dmg.tuwien.ac.at/pottmann/
Helmut Pottmann made fundamental contributions at the intersection between mathematics and geometric modeling. An original aspect of his research is his deep analysis of the interplay between geometric considera-tions and numerical optimization, that take a specific form in the context of discretized objects. Prominent examples of his contributions include theoreti-cal understanding of 3D registration using distance fields and robust feature detection using integral invariants (twice voted for top cited paper in CAGD). He also contributed to data modeling using kinematic structures, as well as several contributions to more classical computer aided geometric design.
In 2006 he started exploring applications of his original approach to architec-tural design, and published ”Geometric modeling with conical meshes and developable surfaces” in ACM SIGGRAPH. He subsequently explored the underlying elegant mathematical structures, which are published e.g. in 'A curvature theory for discrete surfaces based on mesh parallellity', Math. Anna-len 2010. His original viewpoint on architectural design has now become a new research area, called ”architectural geometry”, with its own conference AAG (Advances in Architectural Geometry). He launched the AAG conference in 2008. Within less than a decade, AAG has become a highly successful conference: In 2012, AAG Paris had 450, and AAG Zurich and AAG London had 350 participants.
Geometry at the Interface of Technology and Design
An important stream of research in shape modeling aims at digital tools which support users in realizing their design intent in a simple and intuitive way, while simultaneously taking care of key aspects of function and fabrication. Such tools are expected to shorten the product development cycle through a reduction of costly feedback loops between design, engineering and fabrica-tion. The strong coupling between shape generation, function and fabrication is a rich source for the development of new geometric concepts, with an impact to the original applications as well as to geometric theory: Architectural structures from flat panels and a simple arrangement of supporting beams motivated a careful study of meshes with offset properties and a new curvatu-re theory for polyhedral surfaces. The aesthetics of discrete structures on the large architectural scale revealed the necessity to develop smoothness concepts for polyhedral surfaces. Paneling architectural facades and manu-facturing via wire cutting gave rise to a study of semi-discrete surfaces. Most recently, architectural designs in form of curved support structures from repe-titive flat elements initiated the definition and study of new types of meshes which are of interest in discrete differential geometry and possess applica-tions beyond architecture.
BÉZIE
R AW
ARD
WINN
ER
13
NOTE
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