104 Eastern Heights Drive
Ithaca, NY 14850
I am currently employed at GrammaTech, Inc. where I am involved in static code analysis. Until May, 2014, I worked at Doron Precision Systems, Inc. where I dealt with visual simulation and vehicle dynamics. Until August 18, 2005, I was responsible for the Light Measurement Laboratory of the Program of Computer Graphics.
| Year | Institution | Degree |
|---|---|---|
| 1992 | Cornell University | Master of Science |
| 1980 | University of Michigan | Bachelor of Science in Engineering (Computer Engineering) |
| Years | Organization | Responsibilities |
|---|---|---|
| 2014-present |
GrammaTech, Inc. |
Developed and tested static
analysis checks to enforce coding standards. |
| 2007-2014 |
Doron Precision Systems, Inc. |
Developed new graphics software
for interactive driving simulators. Consulted on hardware and software
requirements. Assisted in maintaining and improving visual models for
real-time display. |
| 2005-2007 | Animusic LLC, Lansing, NY | Teamed with 1 other programmer to reimplement interactive application for animation and music production. Implemented real-time display using Open Scene Graph; partnered in creating custom skins for GUI using Qt toolkit; installed RenderMan render farm on 13-node cluster. |
| 1997-2005 | Cornell University Program of Computer Graphics | Head of Light Measurement Lab |
| 1992-1997 | Ford Motor Company, Dearborn, MI | Supported electronic tools for creative design. Produced HDTV renderings for market research and design evaluation. Consulted on rendering and design issues. |
| 1987-1990 | Ford-Werke AG, Köln, Germany | Coordinated development of CDRS CAD system for design studios. Wrote specifications for CDRS and other development in collaboration with Ford personnel in U.S. and England. |
| 1984-1987 | Ford Motor Company, Dearborn, MI | Researched advanced electronic tools for creative design. |
| 1983-1984 | Ford Motor Company, Dearborn, MI (contractor) | Supported visualization software for structural analysis. |
| 1975-1983 | Environmental Research Institute of Michigan | System programming and management of VAX and PDP-11 systems. Supported software for remote sensing: image processing and atmospheric optics simulation. |
Image-Based BRDF Measurement Including Human Skin, a paper by Steve Marschner and others (including me) on how to measure the BRDF of a curved object using only a good digital camera, an electronic flash, and a Cyberware scanner. This is a PDF file distilled from the actual PostScript® file submitted for the conference proceedings, but one or two figures that were printed in black and white are color here. In addition, two technical reports are avaliable, Image-Based BRDF Measurement and Reflectance Measurements of Human Skin. These provide added technical detail.
Hongsong Li, Sing-Choong Foo, Kenneth E. Torrance, and
Stephen H. Westin.
Automated three-axis
gonioreflectometer for computer graphics applications.
Advanced Characterization Techniques for Optics,
Semiconductors, and Nanotechnologies II, Proc. SPIE 5878, Aug.
2005.
Stephen R. Marschner, Stephen H. Westin, Adam Arbree, and
Jonathan T. Moon.
Measuring
and Modeling the Appearance of Finished Wood.
ACM Transactions on Graphics, Proceedings of SIGGRAPH 2005.
James A. Ferwerda, Stephen H. Westin, Randall C. Smith, and
Richard Pawlicki.
Effects of rendering on shape perception in automobile design.
First ACM Symposium on Applied Perception in Graphics and
Visualization, July 2004, 107-114.
Stephen R. Marschner, Stephen H. Westin, Eric P. F.
Lafortune, and Kenneth E. Torrance.
Image-based bidirectional reflectance distribution function measurement.
Applied Optics-OT, 39(16):2592--2600, June 2000.
Stephen R. Marschner, Stephen H. Westin, Eric P. F.
Lafortune, Kenneth E. Torrance, and Donald P. Greenberg.
Image-based brdf measurement including human skin.
In Eurographics Workshop on Rendering, 1999.
This is a PDF file distilled from the actual PostScript® file submitted for the conference proceedings, but one or two figures that were printed in black and white are color here.
Stephen H. Westin, James R. Arvo, and Kenneth E. Torrance.
Predicting reflectance functions from complex surfaces.
Computer Graphics (SIGGRAPH '92 Proceedings), 26:255--264,
July 1992.
This is a modified version of the PostScript® file used to make the camera-ready copy. I had to insert the images by hand, so cropping and alignment may be a bit different from the SIGGRAPH proceedings. Microgeometry for various surfaces and images used in the paper are also available.
François X. Sillion, James R. Arvo, Stephen H. Westin,
and Donald P. Greenberg.
A global illumination solution for general reflectance distributions.
Computer Graphics (SIGGRAPH '91 Proceedings), 25:187--196,
July 1991.
Stephen H. Westin, Hongsong Li, and
Kenneth E. Torrance.
A comparison of four brdf
models.
Technical report PCG-04-02, Program of Computer Graphics,
Cornell University, April 2004.
Stephen H. Westin, Hongsong Li, and
Kenneth E. Torrance.
A field guide to brdf models.
Technical report PCG-04-01, Program of Computer Graphics,
Cornell University, Jan 2004.
Stephen R. Marschner, Eric P. F. Lafortune, Stephen H.
Westin, , Kenneth E. Torrance, and Donald P. Greenberg.
Image-based brdf measurement.
Technical report PCG-99-1, Program of Computer Graphics,
Cornell University, Jan 1999.
Stephen R. Marschner, Stephen H. Westin, Eric P. F.
Lafortune, Kenneth E. Torrance, and Donald P. Greenberg.
Reflectance measurements of human skin.
Technical report PCG-99-2, Program of Computer Graphics,
Cornell University, Jan 1999.
Full text of thesis (gzipped PostScript®) This file is about 1.8MB and contains all the figures. The images are all linear in intensity (i.e. no gamma correction).
K. E. Torrance and E. M. Sparrow.
Theory for Off-Specular Reflection from Rough Surfaces.
Journal of the Optical Society of America, vol. 57, no. 9, pp. 1105-1114, 1967.
I scanned this into a PDF file (0.9MB).
Xiao D. He, Kenneth E. Torrance, Francois X. Sillion, and Donald P. Greenberg.
A comprehensive physical model for light reflection.
Computer Graphics (SIGGRAPH '91 Proceedings),
25(4):175--186, July 1991.
Liang Peng and I implemented the model in C++ and verified against
the original C implementation of the 1991 paper.
About Fresnel Reflectance, a short sermon on what it is and why you probably want to use it.
I have written a brief practical explanation of monitor gamma correction, including how to find out the correction for your display.
Try the developing version of the SIGGRAPH '92 multimedia paper, A Fast and Accurate Light Reflection Model. This is eventually intended to be a complete translation into HTML and Java of the NeXT-based MediaView document. The interactive Java illustrations basically work, but lack some of the functionality present on the NeXT. There is also one animation that we haven't managed to resurrect.
I have translated the paper Ein Beitrag zur Optik der Farbanstriche, by Paul Kubelka and Franz Munk, in Zeitschrift für Technishen Physik 12(112). Get the gzipped PostScript® file or the Acrobat PDF file. The PostScript® is about 144K bytes compressed, 588K bytes uncompressed; the PDF file is about 118K. This translation is gradually improving; please send me your corrections and suggestions. Updated Friday, March 12, 2004.
Since posting this translation on the Web, I was contacted by Paul Kubelka’s son Werner, who lives in Brazil. He graciously sent me an autobiographical sketch that his father wrote, apparently in the 1940s.
I have written a simple RenderMan shader to implement the BRDF representation presented in Non-linear approximation of reflectance functions, by Lafortune et al. at SIGGRAPH 97. A sample RIB file showing its application to modeling human skin from measured data, compared with Matt Pharr's quick hack, is here. The resulting image from BMRT is here.
Willem-Jan Markerink has compiled an extensive list of registers (flange-to-film distances) for many cameras. I have made a nicely-formatted version of his list, with some additions and corrections. I also have sorted the list by flange distance to make it easier to see which adaptations might be feasible.
The International Standards Organization has adopted ISO Standard 12233: Photography -- Electronic still-picture cameras -- Resolution measurements for the measurement of camera resolution. The procedure requires a standard test target, which I have converted to a vector format so you can print your own.
As part of the gphoto project, I have helped to update and expand the document describing the serial and USB protocol for communicating with Canon cameras. I provide a prebuilt HTML version of the document here as a convenience for those wha want to communicate with Canon cameras, but don't want to download the entire libgphoto2 source.
Sigma SLR cameras use a unique lens mount that seems to be derived from the Pentax K bayonet mount. I have compared the two and offer a drawing with the results here. NOTE: this is an SVG document, so you may need to download a browser plugin to display it. The link to do so is on the page.
After years of mystification of how to generate special characters in Windows NT, 200, and XP, I think I have learned something about Windows character codes.
