My Research interests include Ray Tracing, Computer Graphics, Computer Architecture, Computer Displays, Virtual Reality, Augmented Reality, Parallel Computing, Real Time Systems, Application Specific Processing, and Human Computer Interaction.

Refereed Publications

  1. Trey Greer, Josef Spjut, David Luebke, Turner Whitted; Hybrid Modulation for Near Zero Display Latency, Society of Information Display, May 24-27, 2016. paper alternate Bibtex
  2. Daniel Kopta, Konstantin Shkurko, Josef Spjut, Erik Brunvand, Al Davis; Memory Considerations for Low Energy Ray Tracing, Computer Graphics Forum, August 7, 2014. paper Bibtex
  3. Daniel Kopta, Konstantin Shkurko, Josef Spjut, Erik Brunvand, Al Davis; An Energy and Bandwidth Efficient Ray Tracing Architecture, High-Performance Graphics (HPG 2013), Anaheim, July 10-21, 2013. paper Bibtex
  4. Daniel Kopta, Thiago Ize, Josef Spjut, Erik Brunvand, Al Davis, Andrew Kensler; Fast, Effective BVH Updates for Animated Scenes, ACM SIGGRAPH Symposium on Interactive 3D Graphics and Games (I3D 2012), Irvine, March, 2012. paper Bibtex
  5. Josef Spjut, Daniel Kopta, Erik Brunvand, Al Davis; A Mobile Accelerator Architecture for Ray Tracing, 3rd Workshop on SoCs, Heterogeneous Architectures and Workloads (SHAW-3), New Orleans, February, 2012. paper slides Bibtex
  6. Daniel Kopta, Josef Spjut, Al Davis, Erik Brunvand; Efficient MIMD Architectures for High-Performance Ray Tracing, IEEE International Conference on Computer Design (ICCD 2010), Amsterdam, October, 2010. paper Bibtex
  7. Seth Pugsley, Josef Spjut, David Nellans, Rajeev Balasubramonian; SWEL: Hardware Cache Coherence Protocols to Map Shared Data onto Shared Caches, 19th International Conference on Parallel Architectures and Compilation Techniques (PACT-19), Vienna, September, 2010. Bibtex
  8. Josef Spjut, Andrew Kensler, Daniel Kopta, Erik Brunvand; TRaX: A Multicore Architecture for Real-Time Ray Tracing, IEEE Transactions on Computer Aided Design of Integrated Circuits and Systems (TCAD), December, 2009. paper Bibtex
  9. Josef Spjut, Andrew Kensler, Erik Brunvand; Hardware-accelerated gradient noise for graphics, Proceedings of the 19th ACM Great Lakes Symposium on VLSI (GLSVLSI'09), Boston, May 10-12, 2009. Bibtex
  10. Niladrish Chatterjee, Seth Pugsley, Josef Spjut, Rajeev Balasubramonian; Optimizing a Multi-Core Processor for Message-Passing Workloads, 5th Workshop on Unique Chips and Systems (UCAS-5), Boston, April, 2009. Bibtex
  11. Josef Spjut, Solomon Boulos, Daniel Kopta, Erik Brunvand, Spencer Kellis; TRaX: A Multi-Threaded Architecture for Real-Time Ray Tracing, Symposium on Application Specific Processors (SASP), Anaheim, June 8-9, 2008.(Best paper award) paper Bibtex

Technical Demos

  1. Kaan Aksit, Ward Lopes, Jonghyun Kim, Josef Spjut, Anjul Patney, Peter Shirley, David Luebke, Steven A. Cholewiak, Pratul Srinivasan, Ren Ng, Martin S. Banks, Gordon D. Love; Varifocal Virtuality: A Novel Optical Layout for Near-Eye Display, SIGGRAPH Emerging Technologies, Los Angeles, July 30 - August 3, 2017. paper alternate Bibtex
  2. Robert Shepherd, Bryan Peele, Benjamin Mac Murray, Jose Barreiros, Omer Shapira, Josef Spjut, David Luebke; Stretchable Transducers for Kinesthetic Interactions in Virtual Reality, SIGGRAPH Emerging Technologies, Los Angeles, July 30 - August 3, 2017. paper alternate Bibtex
  3. Bryan Peele, Benjamin Mac Murray, Jose Barreiros, Robert Shepherd, Omer Shapira, Josef Spjut, David Luebke; Stretchable Transducers for Haptic Interactions in Virtual and Augmented Reality, GTC VR Village, San Jose, May 9 - 11, 2017. Bibtex

Conference Talks and Courses

  1. Bryan Peele, Benjamin Mac Murray, Robert Shepherd, Jose Barreiros, Omer Shapira, Josef Spjut, David Luebke; Stretchable Transducers for Kinesthetic Interactions in Virtual Reality, SIGGRAPH Experience Presentations, Los Angeles, August 3, 2017. paper alternate Bibtex
  2. Josef Spjut, Richard Piersall, Kirklann Lau; Build your own game controller, SIGGRAPH Studio, Los Angeles, August 10, 2015.(Studio Course) slides webpage Bibtex

Dissertation

  1. Josef Spjut; Efficient Ray Tracing Architectures, University of Utah Dissertation, 2015. paper alternate alternate 2 Bibtex

Technical Reports

  1. Jean Sung, Sebastian Krupa, Andrew Fishberg, Josef Spjut; An Approach to Data Prefetching Using 2-Dimensional Selection Criteria, Tech Report, arXiv:1505.03899, May, 2015. paper Bibtex
  2. Dong-hyeon Park, Akhil Bagaria, Fabiha Hannan, Eric Storm, Josef Spjut; Sphynx: A Shared Instruction Cache Exporatory Study, Tech Report, arXiv:1412.1140, December 3, 2014. paper Bibtex
  3. Eric Storm, Josef Spjut; A Time-to-Recache Case Study, Tech Report, March, 2014. paper Bibtex
  4. Andrew Carter, Max Korbel, Paula Ning, Josef Spjut; Qualitative Cache Performance Analysis, Tech Report, September, 2013. paper Bibtex
  5. Josef Spjut, Seth Pugsley; Time to Recache: Measuring Memory Miss Behavior, Tech Report, September, 2011. paper Bibtex
  6. Daniel Kopta, Andrew Kensler, Thiago Ize, Josef Spjut, Erik Brunvand, Al Davis; Fast, Effective BVH Updates for Dynamic Ray-Traced Scenes Using Tree Rotations, Tech Report, UUCS 11-002, University of Utah, July, 2011. paper Bibtex

Refereed Posters

  1. Daniel Kopta, Josef Spjut, Erik Brunvand; Grid-Based Ray Tracing for a Parallel Computing Architecture, High Performance Graphics (HPG'09), New Orleans, August 1-3, 2009. Bibtex
  2. Daniel Kopta, Josef Spjut, Erik Brunvand, Steven Parker; Comparing Incoherent Ray Performance of TRaX vs. Manta, IEEE Symposium on Interactive Ray Tracing (RT08), August 9-10, 2008. Bibtex

HMC Clinic Projects

At Harvey Mudd College I advised a few clinic projects with junior and senior level students paid for by companies. The following is a list of those projects and the people involved. Those before my name are students, after are liaisons from the company.

  • Fabiha Hannan, Cyrus Huang, Sebastian Krupa, Guillaume Legrain, Minh Triet Nguyen, Maggie Rabasca, Zachary Vickland, Tiancheng Yang, Josef Spjut, Philip Cheung, John McNeil, Jef Vivian. Design and Implementation of a Memory Testing Apparatus, Clinic Report for Dart Neuroscience, Harvey Mudd College, 116 pages, May 2015.
  • Olivier Cheng, Stephen Ibanez, Amy Ngai, Joshua Sanz, Avi Thaker, Josef Spjut, Alon Regev; Computer Network Testing, Clinic Report for Ixia, Harvey Mudd College, 48 pages, May 2015.
  • Antoine Billig, Chanel Chang, Austin Chen, Obosa Obazuaye, Jeffrey Steele, Sean Velazquez, Josef Spjut, Pradeep Batra, Adrian Torres, Julia Cline; USB 3.0 to Multi-Protocol Interface Adapter, Clinic Report for Rambus Incorporate, Harvey Mudd College, 183 pages, May 2014.
  • Dylan Stow, Carl Pearson, Jeffrey Steele, Shreyasha Paudel, Adam Parower, Gurchetan Singh, Dong-hyeon Park, Josef Spjut, Warren Furguson; Multiplicative Based Division, Clinic Report for Intel Corp, Harvey Mudd College, 117 pages, May 2013.
  • Allison Card, Kacyn Fujii, Hannah Kastein, Paula Ning, Matthew Tambara, Stephanie Fawaz, Josef Spjut, Sourabh Ravindran, Nitish Murthy, Immersive Audio Game Development Kit Clinic Report for Texas Instruments, Harvey Mudd College, 110 pages, May 2013.

People

I've been fortunate to work with a large number of talented people. The ones I've worked with on research are listed below. Email me if you think you should be on this list and you aren't.

Past Research Students

Eric Storm '15, Ivan Wong '15, Skyler Williams '16, Ramy Elminyawi '16, Amy Ngai '16, Richard Piersall '16, Kirklann Lau '16, Andrew Fishberg '16, Da Eun Shim '16, Fabiha Hannan '16, Paul Jolly '16, Dong-hyeon Park '14, Sami Mourad '14, Akhil Bagaria '16, Andrew Carter '13, Paula Ning '13, Max Korbel '13, Katherine Yang '15

Current and Recent (within 3 years) Collaborators

Trey Greer, Turner Whitted, David Luebke, Timo Aila, Tero Karras, Samuli Laine, Erik Brunvand, Konstantin Shkurko, Daniel Kopta, Al Davis, Seth Pugsley,

Past Collaborators

Mike Parker, Thiago Ize, Andrew Kensler, Rajeev Balasubramonian David Nellans, Niladrish Chatterjee, Pete Shirley, Steve Parker, Solomon Boulos, Spencer Kellis, Frank Vahid, David Sheldon, Scott Sirowy, Roman Lysecky