I am a senior researcher (DR2) with the CNRS, at the Computer Science Department (LIP6, APR team) of Sorbonne Universite. I am also a professor (PCC) at Ecole Polytechnique. My research focuses on Topological Data Analysis and Visualization.
I am the principal investigator of the project TORI (In-situ Topological Reduction of Scientific Data), awarded by the ERC.

   News

 ·  Our paper on Topological Simplification Optimization has been accepted to IEEE VIS! [Aug. 21, 2024]
 ·  Our paper on Localized Discrete Vector Field Construction has been accepted to IEEE VIS! [Aug. 21, 2024]
 ·  Our paper on Distributed Path Compression has been accepted to IEEE LDAV! [Aug. 21, 2024]
 ·  Our poster on Locally Turbulent Vortex Detection has been accepted to IEEE LDAV! [Aug. 21, 2024]
 ·  Our paper on MPI distributed computations in TTK has been accepted to IEEE TVCG! [Apr. 6, 2024]
 ·  Our paper on Wasserstein auto-encoders of topological descriptors has been accepted to IEEE TVCG! [Nov. 13, 2023]
 ·  Our paper on Wasserstein dictionaries of persistence diagrams has been accepted to IEEE TVCG! [Oct. 23, 2023]


Research

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Teaching

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Misc

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A Practical Solver for Scalar Data Topological Simplification

Mohamed Kissi, Mathieu Pont, Joshua A. Levine, Julien Tierny

IEEE Transactions on Visualization and Computer Graphics
Proc. of IEEE VIS 2024.

Code - Replicability stamp
Localized Evaluation for Constructing Discrete Vector Fields

Tanner Finken, Julien Tierny, Joshua A. Levine

IEEE Transactions on Visualization and Computer Graphics
Proc. of IEEE VIS 2024.

Wasserstein Auto-Encoders of Merge Trees (and Persistence Diagrams)

Mathieu Pont and Julien Tierny

IEEE Transactions on Visualization and Computer Graphics
Accepted, to be presented at IEEE VIS 2024.

Code - Replicability stamp
Wasserstein Dictionaries of Persistence Diagrams

Keanu Sisouk, Julie Delon, Julien Tierny

IEEE Transactions on Visualization and Computer Graphics
Accepted, to be presented at IEEE VIS 2024.

Code - Replicability stamp
TTK is Getting MPI-Ready

Eve Le Guillou, Michael Will, Pierre Guillou, Jonas Lukasczyk, Pierre Fortin, Christoph Garth, Julien Tierny

IEEE Transactions on Visualization and Computer Graphics
Accepted, to be presented at IEEE VIS 2024.

Code - Replicability stamp
Distributed Path Compression for Piecewise Linear Morse-Smale Segmentations and Connected Components

Michael Will, Jonas Lukasczyk, Julien Tierny, Christoph Garth

Proc. of IEEE Symposium on Large Data Analysis and Visualization 2024.

Identifying Locally Turbulent Vortices within Instabilities

Fabien Vivodtzev, Florent Nauleau, Jean-Philippe Braeunig, Julien Tierny,

Proc. of IEEE Symposium on Large Data Analysis and Visualization 2024 (poster).

Principal Geodesic Analysis of Merge Trees (and Persistence Diagrams)

Mathieu Pont, Jules Vidal, Julien Tierny

IEEE Transactions on Visualization and Computer Graphics
Accepted, to be presented at IEEE VIS 2023.

Code - Data - Replicability stamp
Discrete Morse Sandwich: Fast Computation of Persistence Diagrams for Scalar Data -- An Algorithm and A Benchmark

Pierre Guillou, Jules Vidal, Julien Tierny

IEEE Transactions on Visualization and Computer Graphics
Accepted, to be presented at IEEE VIS 2023.

Code - Benchmark - Replicability stamp
Merge Tree Geodesics and Barycenters with Path Mappings

Florian Wetzels, Mathieu Pont, Julien Tierny, Christoph Garth

IEEE Transactions on Visualization and Computer Graphics
Proc. of IEEE VIS 2023.

Code
Parallel Computation of Piecewise Linear Morse-Smale Segmentations

Robin Maack, Jonas Lukasczyk, Julien Tierny, Hans Hagen, Ross Maciejewski, Christoph Garth

IEEE Transactions on Visualization and Computer Graphics
Accepted, to be presented at IEEE VIS 2023.

Code - Replicability stamp
Topological Data Analysis of Vortices in the Magnetically-Induced Current Density in LiH Molecule

Malgorzata Olejniczak, Julien Tierny

Physical Chemistry Chemical Physics
Accepted, 2023.

VESTEC: Visual Exploration and Sampling Toolkit for Extreme Computing

Markus Flatken, Artur Podobas, Riccardo Fellegara, Achim Basermann, Johannes Holke, David Knapp, Max Kontak, Christian Krullikowski, Michael Nolde, Nick Brown, Rupert Nash, Gordon Gibb, Evgenij Belikov, Steven Wei Der Chien, Stefano Markidis, Pierre Guillou, Julien Tierny, Jules Vidal, Charles Gueunet, Johannes Günther, Miroslaw Pawlowski, Piero Poletti, Giorgio Guzzetta, Mattia Manica, Agnese Zardini, Jean-Pierre Chaboureau, Miguel Mendes, Adrián Cardil, Santiago Monedero, Joaquín Ramírez, Andreas Gerndt

IEEE Access
Accepted, 2023.

A Hands-on TTK Tutorial for Absolute Beginners

Christoph Garth, Robin Maack, Mathieu Pont, Julien Tierny, Bei Wang, Florian Wetzels, Michael Will

IEEE VIS Tutorials 2023.

Tutorial web page
Topological Analysis of Ensembles of Hydrodynamic Turbulent Flows -- An Experimental Study

Florent Nauleau, Fabien Vivodtzev, Thibault Bridel-Bertomeu, Heloise Beaugendre, Julien Tierny

Proc. of IEEE Symposium on Large Data Analysis and Visualization 2022.

Topological Analysis of Ensemble Scalar Data with TTK, A Sequel

Christoph Garth, Charles Gueunet, Pierre Guillou, Federico Iuricich, Joshua Levine, Jonas Lukasczyk, Mathieu Pont, Julien Tierny, Jules Vidal, Bei Wang, Florian Wetzels

IEEE VIS Tutorials 2022.

Tutorial web page
Wasserstein Distances, Geodesics and Barycenters of Merge Trees

Mathieu Pont, Jules Vidal, Julie Delon, Julien Tierny

IEEE Transactions on Visualization and Computer Graphics
Proc. of IEEE VIS 2021.

Talk video - Code - Data - Replicability stamp
A Progressive Approach to Scalar Field Topology

Jules Vidal, Pierre Guillou, Julien Tierny

IEEE Transactions on Visualization and Computer Graphics
Accepted, Presented at IEEE VIS 2021.

Talk video - Code - Companion video - Replicability stamp
Fast Approximation of Persistence Diagrams with Guarantees

Jules Vidal and Julien Tierny

Proc. of IEEE Symposium on Large Data Analysis and Visualization 2021.

Talk video - Code and Data
Topological Analysis of Ensemble Scalar Data with TTK

Christoph Garth, Charles Gueunet, Pierre Guillou, Lutz Hofmann, Joshua A Levine, Jonas Lukasczyk, Julien Tierny, Jules Vidal, Bei Wang, Florian Wetzels

IEEE VIS Tutorials 2021.

Tutorial web page
TopoMap: A 0-dimensional Homology Preserving Projection of High-Dimensional Data

Harish Doraiswamy, Julien Tierny, Paulo J. S. Silva, Luis Gustavo Nonato, Claudio Silva

IEEE Transactions on Visualization and Computer Graphics
Proc. of IEEE VIS 2020.

Localized Topological Simplification of Scalar Data

Jonas Lukasczyk, Christoph Garth, Ross Maciejewski, Julien Tierny

IEEE Transactions on Visualization and Computer Graphics
Proc. of IEEE VIS 2020.

Code
Topological Data Analysis Made Easy with the Topology ToolKit, What is New?

Martin Falk, Christoph Garth, Charles Gueunet, Pierre Guillou, Attila Gyulassy, Lutz Hofmann, Christopher Kappe, Joshua A Levine, Jonas Lukasczyk, Julien Tierny, Jules Vidal

IEEE VIS Tutorials 2020.

Tutorial web page
Implementing Persistence-Based Clustering of Point Clouds in the Topology ToolKit

Ryan Cotsakis, Jim Shaw, Julien Tierny, and Joshua A. Levine

Upcoming TopoInVis book (accepted).

Report of the TopoInVis TTK Hackathon: Experiences, Lessons Learned, and Perspectives

Jonas Lukasczyk, Jakob Beran, Wito Engelke, Martin Falk, Anke Friederici, Christoph Garth, Lutz Hofmann, Ingrid Hotz, Petar Hristov, Wiebke Köpp, Talha Bin Masood, Małgorzata Olejniczak, Paul Rosen, Jan-Tobias Sohns, Tino Weinkauf, Kilian Werner, Julien Tierny

Upcoming TopoInVis book (accepted).

A Topological Data Analysis Perspective on Non-Covalent Interactions in Relativistic Calculations

Małgorzata Olejniczak, André Severo Pereira Gomes, Julien Tierny,

International Journal of Quantum Chemistry

Code and data - Journal cover!
Progressive Wasserstein Barycenters of Persistence Diagrams

Jules Vidal, Joseph Budin, Julien Tierny

IEEE Transactions on Visualization and Computer Graphics
Proc. of IEEE VIS 2019.
Best Paper Honorable Mention Award

Supplemental material - Code - Fast forward video - Replicability stamp
Ranking Viscous Finger Simulations to an Acquired Ground Truth with Topology-Aware Matchings

Maxime Soler, Martin Petitfrere, Gilles Darche, Melanie Plainchault, Bruno Conche, Julien Tierny

Proc. of IEEE Symposium on Large Data Analysis and Visualization 2019.
Best Paper Award
Task-based Augmented Reeb Graphs with Dynamic ST-Trees

Charles Gueunet, Pierre Fortin, Julien Jomier, Julien Tierny

Proc. of Eurographics Symposium on Parallel Graphics and Visualization 2019

Code - Data
Topological Analysis of High Velocity Turbulent Flow

Thibault Bridel-Bertomeu, Benjamin Fovet, Julien Tierny, Fabien Vivodtzev

Proc. of IEEE Symposium on Large Data Analysis and Visualization 2019 (posters).

Video1 - Video2 - Video3
An Overview of the Topology ToolKit

Talha Bin Masood, Joseph Budin, Martin Falk, Guillaume Favelier, Christoph Garth, Charles Gueunet, Pierre Guillou, Lutz Hofmann, Petar Hristov, Adhitya Kamakshidasan, Christopher Kappe, Pavol Klacansky, Patrick Laurin, Joshua A. Levine, Jonas Lukasczyk, Daisuke Sakurai, Maxime Soler, Peter Steneteg, Julien Tierny, Will Usher, Jules Vidal, Michal Wozniak

Upcoming TopoInVis book (accepted).

Statistical Parameter Selection for Clustering Persistence Diagrams

Max Kontak, Jules Vidal, Julien Tierny

Proc. of Super Computing workshop on Urgent HPC 2019

Topological Data Analysis Made Easy with the Topology ToolKit, A Sequel

Martin Falk, Christoph Garth, Charles Gueunet, Joshua A Levine, Jonas Lukasczyk, Julien Tierny, Jules Vidal

IEEE VIS Tutorials 2019.

Tutorial web page
Task-based Augmented Contour Trees with Fibonacci Heaps

Charles Gueunet, Pierre Fortin, Julien Jomier, Julien Tierny

IEEE Transactions on Parallel and Distributed Systems
Accepted, 2019.

Code
Persistence Atlas for Critical Point Variability in Ensembles

Guillaume Favelier, Noura Faraj, Brian Summa, Julien Tierny

IEEE Transactions on Visualization and Computer Graphics
Proc. of IEEE VIS 2018.

Video - Code - Replicability stamp
Lifted Wasserstein Matcher for Fast and Robust Topology Tracking

Maxime Soler, Melanie Plainchault, Bruno Conche, Julien Tierny

Proc. of IEEE Symposium on Large Data Analysis and Visualization 2018.
Best Paper Honorable Mention Award

Online demo of the core algorithm
Topological Data Analysis Made Easy with the Topology ToolKit

Guillaume Favelier, Charles Gueunet, Attila Gyulassy, Julien Jomier, Joshua Levine, Jonas Lukasczyk, Daisuke Sakurai, Maxime Soler, Julien Tierny, Will Usher, Qi Wu

IEEE VIS Tutorials 2018.

Tutorial web page
Topologically Controlled Lossy Compression

Maxime Soler, Melanie Plainchault, Bruno Conche, Julien Tierny

Proc. of IEEE PacificVis 2018.

Code
Topological Data Analysis for Scientific Visualization

Julien Tierny

Springer, 2018 (ISBN 978-3-319-71507-0).
The Topology ToolKit

Julien Tierny, Guillaume Favelier, Joshua Levine, Charles Gueunet and Michael Michaux

IEEE Transactions on Visualization and Computer Graphics
Proc. of IEEE VIS 2017.
Best Paper Honorable Mention Award

Video - Code
Visualizing the Uncertainty of Graph-based 2D Segmentation with Min-path Stability

Brian Summa, Julien Tierny, Valerio Pascucci

Computer Graphics Forum.
Proc. of EuroVis 2017.
Task-based Augmented Merge Trees with Fibonacci Heaps

Charles Gueunet, Pierre Fortin, Julien Jomier, Julien Tierny

Proc. of IEEE Symposium on Large Data Analysis and Visualization 2017.

Code
Conformal Factor Persistence for Fast Hierarchical Cone Extraction

Ana Vintescu, Florent Dupont, Guillaume Lavoue, Pooran Memari, Julien Tierny

Proc. of Eurographics 2017 (short papers).
Least Squares Affine Transitions for Global Paramterization

Ana Vintescu, Florent Dupont, Guillaume Lavoue, Pooran Memari, Julien Tierny

Proc. of WSCG 2017.
Viscous Fingering: A Topological Visual Analytic Approach

Jonas Lukasczyk, Garrett Aldrich, Michael Steptoe, Guillaume Favelier, Charles Gueunet, Julien Tierny, Ross Maciejewski, Bernd Hamann, and Heike Leitte

Proc. of Conference on Physical Modeling for Virtual Manufacturing Systems and Processes 2017.
Jacobi Fiber Surfaces for Bivariate Reeb Space Computation

Julien Tierny and Hamish Carr

IEEE Transactions on Visualization and Computer Graphics
Proc. of IEEE VIS 2016.
Best Paper Award

Video - Code
Fast and Exact Fiber Surfaces for Tetrahedral Meshes

Pavol Klacansky, Julien Tierny, Hamish Carr, Zhao Geng

IEEE Transactions on Visualization and Computer Graphics
Accepted, to be presented at IEEE VIS 2016.

Video - Code
Contour Forests: Fast Multi-threaded Augmented Contour Trees

Charles Gueunet, Pierre Fortin, Julien Jomier, Julien Tierny

Proc. of IEEE Symposium on Large Data Analysis and Visualization 2016.

Code
Visualizing Ensembles of Viscous Fingers

Guillaume Favelier, Charles Gueunet, Julien Tierny

IEEE VIS Scientific Visualization Contest 2016.
Honorable Mention Award

Video
Habilitation Thesis (HDR):
Contributions to Topological Data Analysis for Scientific Visualization


Julien Tierny

Sorbonne Universite.
April 2016.

Committee:
I. Bloch (President), J.-D. Fekete (Examiner), P. Frey (Examiner), H. Hagen (Reviewer), C. Johnson (Reviewer), B. Levy (Reviewer), P. Ricoux (Examiner), W. Schroeder (Examiner).
Fiber Surfaces: Generalizing Isosurfaces to Bivariate Data

Hamish Carr, Zhao Geng, Julien Tierny, Amit Chattopadhyay, Aaron Knoll

Computer Graphics Forum.
Proc. of EuroVis 2015, accepted.

Video
Distributed Seams for Gigapixel Panoramas

Sujin Philip, Brian Summa, Julien Tierny, Peer-Timo Bremer, Valerio Pascucci

IEEE Transactions on Visualization and Computer Graphics.
Accepted.

Conforming Morse-Smale Complexes

Attila Gyulassy, David Guenther, Joshua Levine, Julien Tierny, Valerio Pascucci

IEEE Transactions on Visualization and Computer Graphics.
Proc. of IEEE VIS 2014, accepted.

Characterizing Molecular Interactions in Chemical Systems

David Guenther, Roberto Alvarez Boto, Julia Contreras-Garcia, Jean-Philip Piquemal, Julien Tierny

IEEE Transactions on Visualization and Computer Graphics.
Proc. of IEEE VIS 2014, accepted.

Mandatory Critical Points of 2D Uncertain Scalar Fields

David Guenther, Joseph Salmon, Julien Tierny

Computer Graphics Forum.
Proc. of EuroVis 2014, accepted.

Video
Active Stitching: Beyond Batch Processing of Panoramas

Brian Summa, Julien Tierny, Peer-Timo Bremer, Giorgio Scorzelli, and Valerio Pascucci

Technical Report, September 2013.

Video
Jacobians and Hessians of Mean Value Coordinates for Closed Triangular Meshes

Jean-Marc Thiery, Julien Tierny, and Tamy Boubekeur

The Visual Computer Journal.
Accepted, 2013.

Video - Code - Appendix
Scalable Seams for Gigapixel Panoramas

Sujin Philip, Brian Summa, Julien Tierny, Peer-Timo Bremer, Valerio Pascucci

Proc. of Eurographics Symposium on Parallel Graphics and Visualization 2013.
Best Paper Award.

Optimal General Simplification of Scalar Fields on Surfaces

Julien Tierny, David Guenther, and Valerio Pascucci

Topological and Statistical Methods for Complex Data, Accepted.

Accurate and robust shape descriptors for the identification of rib cage structures in CT-images with Random Forests

Mariem Gargouri, Julien Tierny, Erwan Jolivet, Philippe Petit, Elsa Angelini

Proc. of IEEE ISBI 2013.

Quality Evaluation of 3D City Building Models with Automatic Error Diagnosis

Jean-Christophe Michelin, Julien Tierny, Florence Tupin, Clement Mallet, and Nicolas Paparoditis

Proc. of ISPRS Conference on SSG 2013.

Generalized Topological Simplification of Scalar Fields on Surfaces

Julien Tierny and Valerio Pascucci

IEEE Transactions on Visualization and Computer Graphics.
Proc. of IEEE VIS 2012, accepted.

Video - Code
Panorama Weaving: Fast and Flexible Seam Processing

Brian Summa, Julien Tierny and Valerio Pascucci

ACM Transactions on Graphics.
Proc. of ACM SIGGRAPH 2012, accepted.

Video
CageR: Cage-based Reverse Engineering of Animated 3D Shapes

Jean-Marc Thiery, Julien Tierny and Tamy Boubekeur

Computer Graphics Forum.
Accepted 2012, Presented at Eurographics 2013.

Video - SIGGRAPH 2012 Talk
Analytic Curve Skeletons for 3D Surface Modeling and Processing

Jean-Marc Thiery, Bert Buchholz, Julien Tierny and Tamy Boubekeur

Computer Graphics Forum.
Proc. of Pacific Graphics 2012, accepted.
Inspired quadrangulation

Julien Tierny, Joel Daniels II, Luis Gustavo Nonato, Valerio Pascucci and Claudio Silva

Computer Aided Design.
Proc. of ACM SPM 2011, accepted.

Video - Appendix
Topology verification for isosurface extraction

Tiago Etiene, Luis Gustavo Nonato, Carlos Scheidegger, Julien Tierny, Thomas Peters, Valerio Pascucci, Mike Kirby and Claudio Silva

IEEE Transactions on Visualization and Computer Graphics.
Accepted 2011, Presented at IEEE VIS 2011.
Interactive quadrangulation with Reeb atlases and connectivity textures

Julien Tierny, Joel Daniels II, Luis Gustavo Nonato, Valerio Pascucci and Claudio Silva

IEEE Transactions on Visualization and Computer Graphics.
Accepted, 2011.

Video
Topological methods in data analysis and visualization

Valerio Pascucci, Xavier Tricoche, Hans Hagen and Julien Tierny (Editors)

Springer, 2010 (ISBN 978-3-642-15013-5).
Interactive exploration and analysis of large scale simulations using topology-based data segmentation

Peer-Timo Bremer, Gunther Weber, Julien Tierny, Valerio Pascucci, Marcus Day and John Bell

IEEE Transactions on Visualization and Computer Graphics.
Accepted, 2010.
Loop surgery for volumetric meshes: Reeb graphs reduced to contour trees

Julien Tierny, Attila Gyulassy, Eddie Simon and Valerio Pascucci

IEEE Transactions on Visualization and Computer Graphics, Vol 15, 2009.
Proc. of IEEE VIS 2009.

Videos
Partial 3D shape retrieval by Reeb pattern unfolding

Julien Tierny, Jean-Philippe Vandeborre and Mohamed Daoudi

Computer Graphics Forum, Vol 28, 2009.

Binaries
Enabling advanced visualization tools in a web-based simulation monitoring system

Emanuele Santos, Julien Tierny, Ayla Khan, Brad Grimm, Lauro Lins, Juliana Freire, Valerio Pascucci, Claudio Silva, Scott Klasky, Roselyne Barreto,, Norbert Podhorszki

Proc. of IEEE eScience 2009.
A topological framework for the interactive exploration of large scale turbulent combustion

Peer-Timo Bremer, Gunther Weber, Julien Tierny, Valerio Pascucci, Marcus Day and John Bell

Proc. of IEEE eScience 2009.
Reeb graph based 3D shape modeling and applications

Julien Tierny

Ph.D. Thesis, LIFL, University of Lille.
October 2008.

Committee: A. Baskurt, B. Levy, C. Labit, A. Srivastava, S. Tison.
Advisors: J.P. Vandeborre, M. Daoudi.

Slides
3D object indexing

Stefano Berretti, Mohamed Daoudi, Alberto del Bimbo, Tarik Filali-Ansary, Pietro Pala, Julien Tierny and Jean-Philippe Vandeborre

Chapter of "3D object processing: compression, indexing and watermarking".
Wiley, 2008.
Enhancing 3D mesh topological skeletons with discrete contour constrictions

Julien Tierny, Jean-Philippe Vandeborre and Mohamed Daoudi

The Visual Computer, Vol 24, 2008.
Fast and precise kinematic skeleton extraction of 3D dynamic meshes

Julien Tierny, Jean-Philippe Vandeborre and Mohamed Daoudi

Proc. of IEEE ICPR 2008.
Reeb chart unfolding based 3D shape signatures

Julien Tierny, Jean-Philippe Vandeborre and Mohamed Daoudi

Proc. of Eurographics 2007 (short paper).
Topology driven 3D mesh hierarchical segmentation

Julien Tierny, Jean-Philippe Vandeborre and Mohamed Daoudi

Proc. of IEEE SMI 2007 (short paper).

Video
Geometry flavored topological skeletons: applications to shape handling, segmentation and retrieval

Julien Tierny, Jean-Philippe Vandeborre and Mohamed Daoudi

Proc. of Second DELOS Conference on Digital Libraries (invited paper), 2007.
3D mesh models: view-based indexing and structural analysis

Mohamed Daoudi, Tarik Filali-Ansary, Julien Tierny and Jean-Philippe Vandeborre

Proc. of DELOS Conference on Digital Libraries (invited paper)
Lecture Notes in Computer Science, 2007.
3D mesh skeleton extraction using topological and geometrical analyses

Julien Tierny, Jean-Philippe Vandeborre and Mohamed Daoudi

Proc. of Pacific Graphics 2006.

Video
Invariant high level Reeb graphs of 3D polygonal meshes

Julien Tierny, Jean-Philippe Vandeborre and Mohamed Daoudi

Proc. of IEEE 3DPVT 2006.
>>> Full publication list


Updated on Sep. 12, 2024.