Tom Duff

Duff was born in Toronto, Ontario, Canada, and was named for his putative ancestor, the fifth Earl of Selkirk. He grew up in Toronto and Leaside. In 1974 he graduated from the University of Waterloo with a B.Math and, two years later, was awarded an M.Sc. from the University of Toronto.

Duff worked at the New York Institute of Technology Computer Graphics Lab and the Mark Williams Company in Chicago before moving to Lucasfilm's Computer Research and Development Division. He and Thomas Porter, another Lucasfilm employee, developed a new approach to compositing images; their 1984 paper, "Compositing Digital Images",{{cite book|last=Porter|first=Thomas|author2=Tom Duff|chapter=Compositing digital images |authorlink=Thomas Porter (Pixar)|authorlink2=Tom Duff|year=1984|title=Proceedings of the 11th annual conference on Computer graphics and interactive techniques|volume=18|issue=3|pages=253–259|doi=10.1145/800031.808606|isbn=978-0-89791-138-2|s2cid=18663039|chapter-url=http://cumincad.architexturez.net//doc/oai-cumincadworks-id-1f66}}{{Dead link|date=May 2023 |bot=InternetArchiveBot |fix-attempted=yes }}
(Available at [http://graphics.pixar.com/library/Compositing/ pixar.com.]) is "[t]he seminal work on an algebra for image compositing", according to Keith Packard,[http://keithp.com/~keithp/porterduff/ Keith Packard's webpage] about Porter & Duff's 1984 paper and "Porter-Duff compositing" is now a key technique in computer graphics. (See, for example, XRender and Glitz.)

Duff later worked for 12 years at Bell Labs Computing Science Research Center, where he worked on computer graphics, wireless networking, and Plan 9;{{cite web|url=http://lambda-the-ultimate.org/node/295#comment-2531|title = Shoot-out: Most annoying compiler error message | Lambda the Ultimate}} in the course of his work there, he authored the well known "rc" shell for the Version 10 Unix operating system.

Duff worked at Pixar Animation Studios from 1996 until his retirement in 2021.{{cite tweet|user=TomDuff|first=Tom|last=Duff|authorlink=Tom Duff|number=1350133290791915520|date=January 15, 2021|title=Today, I'm retiring from Pixar, 40+ years after I first started. It's been a great run. Keep making the world's best movies #pixar.}}

• In 1995, he was awarded (with others) the Academy Scientific and Engineering Award for his work on digital image compositing. With Bill Reeves he designed the first version of Pixar's Marionette 3-D animation system, which won the same award in 1997.
• While working at Lucasfilm, he created Duff's device, a loop unrolling mechanism in C.
• On August 22, 2006, the United States Patent and Trademark Office issued {{US patent|7095409}} to Pixar for a "Shot shading method and apparatus" invented by Tom Duff and Robert L. Cook.
• On October 31, 2006, the United States Patent and Trademark Office issued {{US patent|7129940}} to Pixar for a "Shot rendering method and apparatus" invented by Tom Duff and Robert L. Cook.
• In 2015 he became the 21st awardee of the J.W. Graham Medal, named in honor of Wes Graham an early influential Professor of Computer Science at the University of Waterloo, and annually awarded to an influential alumnus of the University's Faculty of Mathematics.

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| title = Recipients of the J.W. Graham Medal in Computing & Innovation

| publisher = University of Waterloo

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• Tom Duff makes a cameo appearance in the Niven/Pournelle science fiction novel Footfall as a co-discoverer of the invading spaceship: "Chap named Tom Duff, a computer type, spotted it."
• Tom Duff appears briefly in the documentary film "Noisy People" (dir Tim Perkis, 2006) playing the banjo.{{cite web|url=http://noisypeople.perkis.com |title=Noisy People: Improvising a Musical Life |publisher=Noisypeople.perkis.com |date= |accessdate=2022-08-12}}

• Mothra, a Web browser Tom Duff wrote for Plan 9
• List of people by Erdős number, Duff has an Erdős number of 2N.J.A. Sloane, R.H. Hardin, T.S. Duff, J.H. Conway: "Minimal-Energy Clusters of Hard Spheres", Discrete & Computational Geometry 14, No. 3, 237–259, 1995.J.H. Conway, H.T. Croft, P. Erdos, M.J.T. Guy: "On the Distribution of Values of Angles Determined by Coplanar Points", J. London Math. Soc., II., Ser. 19, 137–143, 1979.
• List of Pixar staff
• List of University of Waterloo people

{{Reflist}}

• [http://www.tomduff.com/about.html Tom Duff] (short cv on family web site)
• [http://www.iq0.com/ iq0] (personal web site)
• [http://doc.cat-v.org/plan_9/4th_edition/papers/rc rc - The Plan 9 Shell]
• [http://doc.cat-v.org/plan_9/2nd_edition/papers/panel/ A Quick Introduction to the Plan 9 Panel Library, a GUI toolkit by Tom Duff]
• Tom Duff "[https://web.archive.org/web/20100322205110/http://vx.netlux.org/lib/vtd01.html Viral Attacks On UNIX System Security]", AT&T 11273-880728-02TMS, August 1987

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Category:1952 births

Category:Living people

Category:Computer graphics professionals

Category:University of Waterloo alumni

Category:Unix people

Category:Pixar people

Category:Plan 9 people

Category:Scientists at Bell Labs

Category:People from Toronto

Category:J.W. Graham Medal awardees

Category:New York Institute of Technology faculty

Category:Lucasfilm people