Email:	cdtwigg at cs.cmu.edu

I am a member of the Research and Development group at Industrial Light & Magic. I recently finished my Ph.D in Carnegie Mellon University's Computer Science Department, where I was advised by Doug James and worked in the graphics group. I completed my undergraduate at the the University of Washington with a dual degree in comprehensive math and computer science, where I worked with Steven Seitz and Zoran Popović. While at the UW, I played snare drum in the marching band, TAed several graphics courses, and was involved in the production of the animated film The Last Lift (available from UWCSE's video page). More recently, in addition to my research, I was involved in the production of a different short film that appeared at SIGGRAPH, designed the lab web site, and was the drummer in the now-defunct all-grad-student dance band "No One Has To Know" (a.k.a. N1H2K). While not working, I enjoy cooking, climbing, squash, skiing, cycling, backpacking, photography, and drumming.

Research

Controlling Multibody Dynamics via Browsing and Time Reversal, Ph.D. thesis, Carnegie Mellon University.

Backwards Steps in Rigid Body Simulation, with Doug L. James, in ACM SIGGRAPH 2008. [project]

Many-Worlds Browsing for Control of Multibody Dynamics, with Doug L. James, in ACM SIGGRAPH 2007. [project]

Mesh Ensemble Motion Graphs: Data-driven Mesh Animation with Constraints, with Doug L. James, Andrew A. Cove, and Robert Y. Wang, in ACM Transactions on Graphics. [pdf] [project] [video]

Skinning Mesh Animations, with Doug L. James in ACM SIGGRAPH 2005. [pdf] [project] [video]

Estimating Cloth Simulation Parameters from Video, with Kiran Bhat, Jessica Hodgins, Pradeep Khosla, Zoran Popović, and Steven Seitz in ACM SIGGRAPH/Eurographics Symposium on Computer Animation 2003. [pdf] [project] [video]

Teaching

Courses I've TAed:

• 15-864 Advanced Computer Graphics (Spring 2004, Carnegie Mellon)
• 15-462 Computer Graphics I (Spring 2003, Carnegie Mellon)
• CSE591 PMP Graphics (Spring 2002, University of Washington)
• CSE457 Undergraduate Graphics (Autumn 2001, University of Washington)
• CSE591 PMP Graphics (Spring 2001, University of Washington)

Software

• Many-Worlds Browsing demo. Source code soon.
• Mesh Ensemble Motion Graphs data and viewer + source
• Skinning Mesh Animations demo + data
• rps/rwho for querying remote computers
• Software for generating a graphics-lab-style publications page out of a single BiBTeX file.

Other

Graphics portfolio. Images from stuff I worked on during undergrad.

Photography. I've finally entered the digital age and you can find all my pictures on flickr. See also my panorama work.

Links

Graphics links

• SIGGRAPH 2008 papers online
• Older SIGGRAPH and SCA papers
• graphbib

Programming links

• Boost C++ library
• SGI STL
• wxWidgets docs (the best free cross-platform widget toolkit)
• Python library reference

Pittsburgh links

Fall 2002 - Spring 2008

• The Climbing Wall: Great place to practice (not-so-great website, though). They recently lost their domain to squatters, so update your links.
• The Kretschmann Farm: Local organic produce, delivered to your neighborhood
• buskarma.com: a better site for PAT schedules than the PAT website - [Forbes and Hamburg Building] [Beechwood and Wilkins]
• Also, Google Transit
• Pittsburgh weather
• Pittsburgh driving tutorial courtesy Ryan Kelly
• All-Clad Metalcrafters has a factory just outside Pittsburgh and holds a factory seconds sale twice a year, in December and May. I used to be on their mailing list but I don't seem to any more, so you should contact them directly if you want notification.
• Pittsburgh Free Ride, a very cool all-volunteer organization dedicated to spreading cycling through DIY repair work and other service.

San Francisco links

Spring 2008 - ?

• San Francisco weather. What was that you say? Fog, in the Sunset District? I'm shocked, I tell you, shocked!
• SF has only one 80s night that I know about, at Cat Club, conveniently located on the N Owl route, but inconveniently on Thursday nights; not so good for us working stiffs. Why is Thursday considered International Standard 80s Night?
• On the other hand, San Francisco has Tainted Love, also known as the world's second-best 80s cover band.
• Planet Granite recently opened swanky new digs some 5 minutes from ILM World Headquarters.
• The wonderfully old-school Golden Gate Fitness has two beautiful, rusty squat cages, and is way cheaper than your silly yuppie gym. And its location in the scenic Inner Sunset puts it at roughly the center of the universe. Why would you go anywhere else?
• I would argue that Google Transit has now surpassed 511 Trip Planner. But shouldn't you be riding your fixie or something?