News


  1. DART is an open source software which adds many cool features to RTQL8 for robotics community. It is a collaborative work between our lab and Georgia Tech Humanoid Robot Lab (April 1, 2013)

  2. RTQL8 (pronounced “articulate”), a dynamic multibody simulator developed by our lab, is now available online. (October 3, 2012)

  3. My son, Connor Hsu, was born on September 19! He is the cutest nocturnal creature. (September 28, 2012)

  4. Received ACM SIGGRAPH Significant New Researcher Award. Check out the Award Talks. (August 6, 2012)

  5. A short tutorial on multibody dynamics is here. Other tutorials I wrote for my students can also be found on this website. (June 29, 2012)

  6. It’s official now. I am a tenured professor at Georgia Tech! (June 1, 2012)



Short Bio


I joined Georgia Tech in August 2007 in School of Interactive Computing. Before moving to Atlanta, I was an assistant professor at the University of Southern California from January 2006, after I received my Ph.D and M.S. in 2005 and 2001 from the University of Washington. My research interests are in computer graphics and animation, including physics-based animation, character animation, optimal control, numerical methods, robotics and computational biomechanics. My Ph. D. thesis focuses on designing a generative model for human natural motion. I am a member of the Graphics Lab at Georgia Tech.



Research


Orienting in Mid-air through Configuration Changes to Achieve a Rolling Landing for Reducing Impact after a Fall, Jeffrey T. Bingham, Jeongseok Lee, Ravi N. Haksar, Jun Ueda, and C. Karen Liu, in IEEE/RSJ International Conference on
Intelligent Robots and Systems, 2014



Learning Bicycle Stunts, Jie Tan, Yuting Gu, C. Karen Liu, and Greg Turk, in Transactions on Graphics, 2014



Iterative Training Of Dynamic Skills Inspired By Human Coaching Techniques, Sehoon Ha and C. Karen Liu, in Transactions on Graphics, 2014



Dexterous Manipulation Using Both Palm and Fingers, Yunfei Bai and C. Karen Liu, in IEEE International Conference on Robotics and Automation, 2014



Generating Human-like Motion for Robots, Michael J. Gielniak, C. Karen Liu, and Andrea L. Thomaz, in The International Journal of Robotics Research, 2013




Physics Storyboards, Sehoon Ha, Jim McCann, C. Karen Liu, and Jovan Popovic, in Computer Graphics Forum (presented at Eurogrphics), 2013



Falling and Landing Motion Control for Character Animation, Sehoon Ha, Yuting Ye and C. Karen Liu, in ACM Transactions on Graphics (presented at SIGGRAPH Asia), 2012



Synthesis of Concurrent Object Manipulation Tasks, Yunfei Bai, Kristin Siu and C. Karen Liu, in ACM Transactions on Graphics (presented at SIGGRAPH Asia), 2012



Synthesis of Detailed Hand Manipulations Using Contact Sampling, Yuting Ye and C. Karen Liu, in ACM Transactions on Graphics (presented at SIGGRAPH), 2012



Soft Body Locomotion, Jie Tan, Greg Turk, and C. Karen Liu, in ACM Transactions on Graphics (presented at SIGGRAPH), 2012



Controlling Physics-Based Characters Using Soft Contacts, Sumit Jain, and C. Karen Liu, in ACM Transactions on Graphics (presented at SIGGRAPH Asia), 2011



Modal-Space Control for Articulated Characters, Sumit Jain and C. Karen Liu, in ACM Transactions on Graphics (presented at SIGGRAPH Asia), 2011



Human Motion Reconstruction from Force Sensors, Sehoon Ha, Yunfei Bai, and C. Karen Liu, in ACM SIGGRAPH/Eurographics Symposium on Computer Animation 2011



Articulated Swimming Creatures, Jie Tan, Yuting Gu, Greg Turk, and C. Karen Liu, in ACM Transactions on Graphics (presented at SIGGRAPH), 2011



Task-aware Variations, Michael J. Gielniak, C. Karen Liu, and Andrea L. Thomaz, in IEEE International Conference on Robotics and Automation (ICRA) 2011



Stable Proportional-Derivative Controllers, Jie Tan, C. Karen Liu, and Greg Turk, in IEEE Computer Graphics and Applications (CG&A) 2011, Special Issue on Physically Based Character Animation



Secondary Action in Robot Motion, Stylized Motion Generalization Through Adaptation of Velocity Profile,  Michael J. Gielniak, C. Karen Liu, and Andrea L. Thomaz, in IEEE International Symposium on Robot and Human Interactive Communication (RO-MAN), 2010



Optimal Feedback Control for Character Animation Using an Abstract Model, Yuting Ye and C. Karen Liu, in ACM Transactions on Graphics (presented at SIGGRAPH), 2010



Performance Capture with Physical Interaction, Nam Nguyen, Nkenge Wheatland, David Brown, Brian Parise, C. Karen Liu, and Victor Zordan, in ACM SIGGRAPH/Eurographics Symposium on Computer Animation 2010



Synthesis of Responsive Motion Using a Dynamic Model, Yuting Ye and C. Karen Liu, in Computer Graphics Forum (presented at Eurographics), 2010



Interactive Synthesis of Human-Object Interaction, Sumit Jain and C. Karen Liu, in ACM SIGGRAPH/Eurographics Symposium on Computer Animation 2009



Dextrous Manipulation from a Grasping Pose, C. Karen Liu, in ACM Transactions on Graphics (presented at SIGGRAPH), 2009



Performance-Based Control Interface for Character Animation, Satoru Ishigaki, Timothy White, Victor Zordan, and C. Karen Liu, in ACM Transactions on Graphics (presented at SIGGRAPH), 2009



Optimization-based Interactive Motion Synthesis, Sumit Jain, Yuting Ye, and C. Karen Liu, in ACM Transactions on Graphics (presented at SIGGRAPH), 2009



Animating Responsive Characters with Dynamic Constraints in Near-Unactuated Coordinates, Yuting Ye and C. Karen Liu, in ACM Transactions on Graphics (presented at SIGGRAPH Asia), 2008



Synthesis of Interactive Hand Manipulation, C. Karen Liu, in ACM SIGGRAPH/Eurographics Symposium on Computer Animation 2008



Composition of Complex Optimal Multi-Character Motions, C. Karen Liu, Aaron Hertzmann, and Zoran Popovic, in ACM SIGGRAPH/Eurographics Symposium on Computer Animation 2006



Dance Reveals Symmetry Especially in Young Men, William Brown, Lee Cronk, Keith Grochow, Amy Jacobson, C. Karen Liu, Zoran Popovic, and Robert Trivers, in Nature, 2005



Learning Physics-Based Motion Style with Nonlinear Inverse Optimization, C. Karen Liu, Aaron Hertzmann, and Zoran Popovic, in ACM Transactions on Graphics (presented at SIGGRAPH), 2005



Momentum-Based Parameterization of Dynamic Character Motion, Yuihi Abe, C. Karen Liu, and Zoran Popovic, in ACM SIGGRAPH / Eurographics Symposium on Computer Animation 2004



Synthesis of Complex Dynamics Character Motion from Simple Animation, C. Karen Liu and Zoran Popovic, in ACM Transactions on Graphics (presented at SIGGRAPH), 2002




Code and Tutorials


RTQL8: Dynamics Multibody Simulator


A Short Tutorial on Multibody Dynamics


Contact Handling for Articulated Rigid Bodies Using LCP


Angular Momentum Computation for Multibody Systems



Teaching


CS4496: Computer Animation for Undergrads


CS7496: Computer Animation for Grads


CS8803: Numerical Optimization and Applications



Students


Jie Tan (PhD)

Sehoon Ha (PhD)

Yunfei Bai (PhD)

Jeongseok Lee (PhD)

Alex Clegg (PhD)


Past students:

Jeff Bingham (Postdoc, Google)

Kristin Siu (Master)

Chen Tang (Master)

Sumit Jain (PhD, Google)

Yuting Ye (PhD, ILM)

Satoru Ishigaki (Master, Toshiba)

Ben Litowitz (Undergrad, Bungie)

Chris Russell (Undergrad, Microsoft)

Michael Gielniak (Postdoc)

Eric Tobis (MS, High-Rez Studios)

Murali Varma (Master, Zynga)

Nick Levesque (Undergrad)



Awards






 
  1. C.Karen Liu


Associate Professor

School of Interactive Computing

College of Computing

Georgia Institute of Technology


Office: TSRB 230A

Email: karenliu@cc.gatech.edu


85 5th St NW, Atlanta GA 30308

404-8946609