Priv.-Doz. Dr. Stefan Zellmann

I switched departments and this is my new website:
https://pds.uni-koeln.de/group/team/stefan-zellmann

 

Contact:

• Tel.: +49 (0) 221 470 89615
• Mail: lastname at uni-koeln.de

Research Interests:

• Direct volume rendering
• Physically based and photorealistic rendering
• AMR visualization
• High performance computing
• GPGPU computing
• FPGA programming

Awards:

• Honorable Mention Award @EGPGV 2020
  for the paper: "Finding Efficient Spatial Distributions for Massively Instanced 3-d Models".
• Best Paper Award @EGPGV 2018
  for the paper: "Rapid k-d Tree Construction for Sparse Volume Data".
• Best Paper Award @VDA 2017
  for the paper: "Ray traced volume clipping using multi-hit BVH traversal".
• Best Paper Award @PDCS 2012
  for the paper: "A Software Architecture for Distributed Volume Rendering on HPC Systems".

Teaching:

• Vorlesung Praktische Informatik (SS 2019): Architektur und Programmierung von Grafik- und Koprozessoren [Link]
• Hauptseminar Nutzung von Grafikprozessoren zur Darstellung und Simulation [Link]
• Vorlesung Technische Informatik (SS 2018): Architektur und Programmierung von Grafik- und Koprozessoren [Link]

Projects:

• ExaBrick AMR rendering framework [Internal Link]
• Visionaray ray tracing framework [Link]
• Virvo volume rendering library [Link]
• HPSC TerrSys: High performance computing in terrestrial systems [Link]

Services:

• Posters Co-Chair IEEE LDAV 2022
• Program Committee Member IEEE VIS 2022
• Program Committee Member IEEE VIS 2021
• Program Committee Member EGPGV 2021
• Program Committee Member EGPGV 2020
• Regular reviewing for: IEEE VR, EGPGV, IEEE Access, other journals and conferences

Blog (mostly about my papers and research):

http://blog.szellmann.de

Twitter Account:

@stefanzellmann

Orcid ID:

https://orcid.org/0000-0003-2880-9090

Peer-Reviewed Publications:

• S. Zellmann, I. Wald, J. Barbosa, S. Demirci, A. Sahistan, U. Güdükbay (2022),
  "Hybrid Image-/Data-Parallel Rendering Using Island Parallelism".
  accepted at: The 12th IEEE Symposium on Large Data Analysis and Visualization (LDAV 2022).
  PDF
   
• S. Zellmann, I. Wald, A. Sahistan, M. Hellmann, W. Usher (2022),
  "Design and Evaluation of a GPU Streaming Framework for Visualizing Time-Varying AMR Data".
  Eurographics Symposium on Parallel Graphics and Visualization (EGPGV 2022).
  PDF Link
   
• S. Zellmann, D. Seifried, N. Morrical, I. Wald, W. Usher, J. P. Law-Smith, S. Walch-Gassner, A. Hinkenjann (2022)
  "Point Containment Queries on Ray Tracing Cores for AMR Flow Visualization".
  Computing in Science and Engineering (CiSE), Special Issue: Hardware-Accelerated Ray Tracing for Scientific Applications (Mar/Apr 2022)
  Link
   
• S. Zellmann (2021),
  "Remote Volume Rendering with a Decoupled, Ray-Traced Display Phase".
  Smart Tools and Applications in Graphics (STAG 2021).
  PDF
   
• A. Sahistan, S. Demirci, N. Morrical, S. Zellmann, A. Aman, I. Wald, U. Güdükbay (2021),
  "Ray-traced Shell Traversal of Tetrahedral Meshes for Direct Volume Visualization".
  IEEE Visualization Short Papers (VIS 2021).
  PDF
   
• I. Wald, N. Morrical, S. Zellmann (2021),
  "A Memory Efficient Encoding for Ray Tracing Large Unstructured Data".
  IEEE Visualization (VIS 2021).
  PDF
   
• I. Wald, S. Zellmann, N. Morrical (2021),
  "RTX-Accelerated Empty Space Skipping using Triangulated Active Region Boundary Geometry".
  accepted at: Eurographics Symposium on Parallel Graphics and Visualization (EGPGV 2021).
   
• N. Morrical, S. Zellmann (2021),
  "Inverse Transform Sampling using Ray Tracing Hardware".
  Ray Tracing Gems II (book, Aug. 2021).
  Link
• I. Wald, S. Zellmann, W. Usher, N. Morrical, U. Lang, V. Pascucci (2020),
  "Ray Tracing Structured AMR Data Using ExaBricks".
  IEEE Visualization (VIS 2020).
  Link PDF
   
• S. Zellmann, M. Weier, I. Wald (2020),
  "Accelerating Force-Directed Graph Drawing with RT Cores".
  IEEE Visualization (VIS 2020).
  Link PDF
   
• I. Wald, N. Morrical, S. Zellmann, L. Ma, W. Usher, T. Huang, V. Pascucci (2020),
  "Using Hardware Ray Transforms to Accelerate Ray/Primitive Intersections for Long, Thin Primitive Types".
  High Performance Graphics (HGP 2020).
  Details Link PDF
   
• S. Zellmann, N. Morrical, I. Wald, V. Pascucci (2020),
  "Finding Efficient Spatial Distributions for Massively Instanced 3-d Models".
  Eurographics Symposium on Parallel Graphics and Visualization (EGPGV 2020).
  Details Link PDF Bibtex
   
• S. Zellmann, M. Aumüller, N. Marshak, I. Wald (2020),
  "High-Quality Rendering of Glyphs Using Hardware-Accelerated Ray Tracing".
  Eurographics Symposium on Parallel Graphics and Visualization (EGPGV 2020).
  Details Link PDF Bibtex
• S. Zellmann, D. Meurer, U. Lang (2019),
  "Hybrid Grids for Sparse Volume Rendering".
  IEEE Visualization, Vancouver, Canada, October 20-25, 2019.
  Details Link PDF
   
• S. Zellmann, J.P. Schulze, U. Lang (2019),
  "Binned k-d Tree Construction for Sparse Volume Data on Multi-Core and GPU Systems".
  IEEE Transactions on Visualization and Computer Graphics (TVCG), Early Access.
  Link
   
• S. Zellmann, M. Hellmann, U. Lang (2019),
  "A Linear Time BVH Construction Algorithm for Sparse Volumes".
  IEEE Pacific Visualization Symposium (PacificVis 2019), Bangkok, Thailand, April 23-26, 2019.
  Details Link PDF
   
• S. Zellmann, J.P. Schulze, U. Lang (2018),
  "Rapid k-d Tree Construction for Sparse Volume Data".
  Eurographics Symposium on Parallel Graphics and Visualization (EGPGV 2018), Brno, Czech Republic, June 4, 2018.
  Details Link Bibtex Slides
   
• S. Zellmann, U. Lang (2017),
  "C++ Compile Time Polymorphism for Ray Tracing".
  Proceedings of the 22nd Symposium on Vision, Modelling and Visualization (VMV 2017), Bonn, Germany, September 25-27, 2017.
  Details Link PDF Bibtex
• S. Zellmann, D. Wickeroth, U. Lang (2017),
  "Visionaray: A Cross-Platform Ray Tracing Template Library".
  Proceedings of the 10th Workshop on Software Engineering and Architectures for Realtime Interactive Systems (IEEE SEARIS 2017), Los Angeles, California, USA, March 19, 2017.
  Details PDF Slides
• S. Zellmann, M. Hoevels, U. Lang (2017),
  "Ray traced volume clipping using multi-hit BVH traversal".
  Proceedings of Visualization and Data Analysis (VDA), Burlingame, California, USA, January 29-February 2, 2017. DOI: 10.2352/ISSN.2470-1173.2017.1.VDA-392
  Details Link PDF Bibtex Slides
• D. Hoffmeister, S. Zellmann, A. Pastoors, M. Kehl, P. Cantalejo, J. Ramos, G. C. Weniger, G. Bareth (2015),
  "The investigation of the Ardales Cave, Spain - 3D documentation, topographic analyses, and lighting simulations based on terrestrial laser scanning".
  Archaeological Prospection. DOI: 10.1002/arp.1519
  Link Bibtex
• S. Zellmann, Y. Percan, U. Lang (2015),
  "Advanced texture filtering: a versatile framework for reconstructing multi-dimensional image data on heterogeneous architectures".
  Proceedings of Visualization and Data Analysis (VDA), San Francisco, California, USA, February 8-12, 2015.
  Link Bibtex
• Y. Percan, S. Zellmann, U. Lang (2014),
  "Asymptotic error of cubic B-spline interpolation using prefiltering".
  Springer Numerical Algorithms. DOI: 10.1007/s11075-014-9941-x
  Link PDF Bibtex
   
• D. Hoffmeister, S. Zellmann, K. Kindermann, A. Pastoors, U. Lang, O. Bubenzer, G. C. Weniger, G. Bareth (2014),
  "Geoarchaeological site documentation and analysis of 3D data derived by terrestrial laser scanning".
  ISPRS Annals of Photogrammetry, Remote Sensing and Spatial Information Sciences, II-5, pp. 173-179, 2014.
  Link Bibtex
   
• S. Zellmann, U. Lang (2013),
  "A Comparison of GPU Box-Plane Intersection Algorithms for Direct Volume Rendering".
  Proceedings of the 14th IASTED International Conference on Computer Graphics and Imaging (CGIM),
  Innsbruck, Austria, February 12-14, 2013.
  Link PDF Bibtex Slides
   
• S. Zellmann, U. Lang (2012),
  "A Software Architecture for Distributed Volume Rendering on HPC Systems".
  Proceedings of the 24th IASTED International Conference on Parallel and Distributed Computing and Systems (PDCS),
  Las Vegas, Nevada, USA, November 12-14, 2012.
  Link Bibtex
   
• S. Zellmann, M. Aumüller, U. Lang (2012),
  "Image-Based Remote Real-Time Volume Rendering - Decoupling Rendering from View Point Updates".
  Proceedings of the ASME 2012 International Design Engineering Technical Conferences & Computers and Information in Engineering Conference (IDETC/CIE),
  Chicago, Illinois, USA, August 12-15, 2012.
  Link Bibtex

Preprints and Technical Reports:

• S. Zellmann, G. Aguirre, J.P. Schulze (2022),
  "Volkit: A Performance-Portable Computer Vision Library for 3D Volumetric Data".
  Preprint on arXiv.org, technical report.
  Link
   
• J. A. P. Law-Smith, R. W. Everson, E. Ramirez-Ruiz, S. E. de Mink, L. A. C. van Son, Y. Götberg, S. Zellmann, A. Vigna-Gómez, M. Renzo, S. Wu, S. L. Schrøder, R. J. Foley, T. Hutchinson-Smith (2020),
  "Successful Common Envelope Ejection and Binary Neutron Star Formation in 3D Hydrodynamics".
  Preprint on arXiv.org
  Link
   
• S. Zellmann (2020),
  "Augmenting Image Warping-Based Remote Volume Rendering with Ray Tracing".
  Technical Report.
  PDF
   
• S. Zellmann (2019),
  "Adding Custom Intersectors to the C++ Ray Tracing Template Library Visionaray".
  Technical Report.
  PDF
   
• S. Zellmann (2019),
  "Comparing Hierarchical Data Structures for Sparse Volume Rendering with Empty Space Skipping".
  Technical Report.
  PDF

Dissertation:

• S. Zellmann (2014),
  "Interactive High-Performance Volume Rendering".
  PhD thesis, 19 August 2014.
  Link Bibtex

Talks:

• S. Zellmann (2016), "Visionaray: A Modern C++ Framework for Prototyping Ray Tracing Kernels". Libre Graphics Meeting 2016, London, United Kingdom, April 15-18, 2016.
  Link Slides