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Colloquium – Yin Yang
March 20, 2019 @ 10:00 am - 11:00 am
University of New Mexico, Albuquerque
March 20, 2019
lecture – 10:00am
Host: Ladislav Kavan
Recent Progress in Deformable Simulation
Using the digital computer to simulate dynamic behavior of elastic objects is a highly desired feature in many scientific and engineering research: in computer animation, it provides realistic effects of soft characters; in surgical simulation, it delivers vivid visual experiences to the trainee; in digital fabrication, it couples geometry design and mechanical analysis. While the basic model has been well established for a while, robustly simulating nonlinear and high-resolution deformable objects is still a challenging problem, especially in a collision-rich environment. In this talk, I will talk about some of our recent efforts on this classic graphics challenge. First, I would like to introduce a new finite difference scheme which is highly accurate. It frees us from deriving the actual energy gradient/Hessian of complicated nonlinear materials. This is achieved by adding a small perturbation at the imaginary domain of the target function so that the subtractive cancellation can be avoided. For geometry-complex objects, collision and self-collision also impose significant computation burden to this system. I will show a new framework seamlessly combining physics simulation and collision handling using generalized coordinate, which is often defined in a much lower-dimensional space. As a result, simulation plus collision handling can be collectively done at an interactive rate. Finally, I will talk about a neural network-based physics solver. This may be the first machine learning based deformable simulation framework. An important feature of this system is that the network training is highly re-usable: a net trained for a rectangular beam can be directly used to simulate a swaying maple tree or a soft Armadillo.
Dr. Yin Yang is currently an Assistant Professor with the department of Electrical and Computer Engineering at the University of New Mexico, Albuquerque. He received Ph.D. degree of Computer Science from The University of Texas, Dallas in 2013 (the awardee of David Daniel Fellowship Prize). He was a Research/Teaching Assistant at UT Dallas as well as UT Southwestern Medical Center. His research mainly focuses on real-time physics-based computer graphics, animation and simulation with a strong emphasis on interdisciplinarity. He was a Research Intern in Microsoft Research Asia in 2012. He received NSF CAREER award in 2019. Dr. Yang has published over 50 conference/journal articles in areas of computer graphics, animation, computer aided design, and medical imaging. He serves as the TPC member for many international conferences and the reviewer for almost all the top journals/conferences in computer graphics and animation.