Our approach, ConJac, is based on condensation, a Articles … Turbulent detail is what makes typical fluid simulations look impressive, and the underlying physics motivate a powerful approach for control: they allow for an elegant split of large scale motion and small scale turbulent detail. Theodore Kim Yale University. Solidification is usually posed as a so-called `Stefan problem', but the problem in its classic form is inappropriate for simulating the ice typically found in a winter scene. Our method preserves the dispersion properties of real waves, yet it supports interactions with obstacles and is computationally efficient. My first (uncredited) work appeared on-screen on However, its relationship to the finite element method (FEM) has always been unclear, because the model resists being written as an isotropic, hyperelastic strain energy. The Lévy Dragon is a well-known fractal introduced by Paul Lévy in 1938. Theodore Kim Associate Professor Yale University Department of Computer Science Fellow in Grace Hopper College Email: kim@cs.yale.edu Twitter: @_theodorekim I co-lead the Yale Computer Graphics Group alongside Julie Dorsey and Holly Rushmeier.I research topics in physics-based simulation, including fire, water, and humans.My work has appeared in over two dozen movies, and I received a … We present a novel wavelet method for the simulation of fluids at high spatial resolution. Theodore Kim. You don't have to use mine. When these characters are sent as inputs to a cloth simulator, the results can often contain terrible artifacts that must be addressed by tediously sculpting either the input characters or the output cloth. recently proposed an octree data structure for simulating water and smoke, and we show that this discretization can be applied to the problem of lightning simulation as well. News. The geometric and optical complexity of ice has been a constant source of wonder and inspiration for scientists and artists. The complexity of the scenarios we are able to simulate surpasses those that we have seen from any previous method. Boyle P, 0000-0001-6251-0610; Cancer Epidemiology, Biomarkers & Prevention : a Publication of the American Association for Cancer Research, Cosponsored by the American Society of Preventive Oncology, 28 Feb 2012, 21(5): 866-868 DOI: 10.1158/1055-9965.epi-12-0010 PMID: 22374993 PMCID: … Theodore Kim (Yale University) Niloy Mitra (UCL) Barbara Solenthaler (ETH Zurich) Partners. Yale Engineering Magazine; How a CS Professor Brought New Life to Toy Story. I will focus on three such methods in this dissertation: phase field methods, diffusion limited aggregation, and level set methods. Ken Perlin New York University. Theodore Kim Cited by. Based on this framework, we also introduce a technique to perform feature-guided video synthesis. Richard Marks Google ATAP. 2011], we are able to simulate multiple solids undergoing complex, frictional contact while simultaneously interacting with a fluid. Both modifications apply equally well to all three architectures. Quaternion julia set shape optimization. We present a new method that achieves a two-way coupling between deformable solids and an incompressible fluid where the underlying geometric representation is entirely Eulerian. Dimensional model reduction can make simulations orders of magnitude faster, but is unsuitable for general deformable body simulations because it requires expensive precomputations, and it can suppress motion that lies outside the span of a pre-specified low-rank basis. We then use these to build fast and concise Newton implementations. ABSTRACT We present a new approach that allows large time steps in dynamic simulations. Under this formulation, the construction and eigendecomposition of the force gradient, long considered the most onerous part of the implementation, becomes fast and simple. Sort by citations Sort by year Sort by title. One challenge is performance: we discuss our current best practices for accelerating system assembly and solver performance. Timothy Langlois Senior Research Scientist, Adobe Verified email at adobe.com. Articles Cited by Public access. Twitter: @_theodorekim, Department of Computer Science Finally, we show that on the Cell processor, it is possible to implement reaction-diffusion on top of an existing fluid solver with no significant performance impact. Ligang Liu University of Science and Technology of China China. We present a new approach that allows large time steps in dynamic simulations. We develop novel methods for seeding and simulating waves over surface points, and use them to generate high-resolution details. We observe a 2x speedup in the advection stage using this scheme. Matthias Müller-Fischer Lead of Physics Research at … For the simulation, we present the dielectric breakdown model, an elegant formulation of electrical pattern formation. … Together, these components enable the discovery of previously-inaccessible designs. Previously, he was a Senior Research Scientist at Pixar Animation Studios, where he designed and implemented many of the solid mechanics algorithms described here. Finally, I present a method of simulating icicle formation. To demonstrate the efficiency of our approach, we include comparisons against existing methods on common graphics tasks such as surface parameterization and volume deformation. Results are provided for various subspace deformation models, several hyperelastic materials (St.Venant-Kirchhoff, Mooney-Rivlin, Arruda-Boyce), and multimodal (graphics, haptics, sound) applications. While fluid simulations are now widely used in the industry, it remains inherently difficult to control large scale simulations, and there is an constant struggle for increasing visual detail. theodore.kim@yale.edu Website: Charalampos Papamanthou, Ph.D., Computer Science, Brown University (2011) Research Scientist (starting as Associate Professor of Computer Science in July 2021) 51 Prospect Street, New Haven, CT 06511 charalampos.papamanthou@yale.edu Website: Ruzica Piskac, Ph.D EPFL, Switzerland 2011. Marshall … T. Kim. Sylvain Lefebvre National Institute for Research in Computer Science and Automation (INRIA) France. Stochastic structural analysis can assess whether a fabricated object will break under real-world conditions. Ken Anjyo OLM Digital and Victoria University of Wellington 確認したメール アドレス: acm.org. Box 208292 • New Haven, CT 06520–8292 • Phone 203–432–4200, Ph.D., University of North Carolina, Chapel Hill, M.S., University of North Carolina, Chapel Hill, Academy Award for Scientific and Technical Achievement, 2012, Best Paper, Symposium on Computer Animation, 2011 and 2016. We address the sources of numerical difficulty and allow the same computation to be performed using 64 bits. This paper presents a novel generative model to synthesize fluid simulations from a set of reduced parameters. 266: 2008: Optimizing cubature for efficient integration of subspace deformations. However, the scalability of the technique was limited because it used high-order rationals requiring 80 bits of precision. Subsequently, our codec only adds a factor of three or four to the overall runtime. Cited by. Theodore Kim. We present a novel algorithm that simulates ice formation. Twitter: @_theodorekim. In addition, the difficulties of liquid simulations will be explained, and an approach for liquid turbulence that is based on wave dynamics will be presented. Theodore Kim is an Associate Professor in Computer Science at Yale University, where he investigates biomechanical solids, fluid dynamics, and selected topics in geometry. However, if computed naively, decompression can be highly inefficient and dominate the running time, effectively negating the advantage of the subspace approach. Theodore Kim Yale University Abstract The Baraff-Witkin [BW98] model has been a popular formulation for cloth for 20 years. We show how to analyze the results of an existing high-resolution simulation, discover an efficient reduced approximation, and use it to quickly "re-simulate" novel variations of the original dynamics. Subspace methods can leverage this coherence, and have been used in the past to accelerate the collision detection stage of contact simulation. Greg Turk Professor, Georgia Tech Verified email at cc.gatech.edu. We then apply a surface-only Lagrangian wave simulation to this high-resolution point set. We find that these vectors form abstract, turbulent patterns in space. Michael Reed Blue Sky Studios. In this paper, we show that this is because the Baraff-Witkin model is actually a coupled anisotropic strain energy. Many of the results can be seen on YouTube, and extensive source code is available on this page. ABSTRACT We present a new approach that allows large time steps in dynamic simulations. In lieu of precomputation, we analyze the motion of the full model as the simulation progresses, incrementally building a reduced-order nonlinear model, and detecting when our reduced model is capable of performing the next timestep. In order to guarantee the positive semi-definiteness required by these methods, a numerical eigendecomposition or approximate regularization is usually needed. 10/08/2019. We then refine the transported texture by performing texture synthesis over the second surface using our `surface texture optimization algorithm, which keeps the synthesized texture visually similar to the input texture and temporally coherent with the transported one. In this work, we choose a subset of nodes to be dynamic nodes, and apply condensation at the velocity level by defining a linear mapping from the velocities of these chosen dynamic DOFs to the velocities of the remaining quasistatic DOFs. Posters Chair 2011 ACM SIGGRAPH / Eurographics Symposium on Computer Animation, I received a BS in Computer Science in 2001 from Cornell and a PhD in Computer Science from UNC Chapel Hill in 2006 under the supervision of. Theodore Kim Yale University Shinjiro Sueda Texas A&M University Figure 1: ConJac Dragon. Eulerian Solids have previously been integrated using explicit schemes, but we develop an implicit scheme that allows large time steps to be taken. Crucially, this enables computation on the GPU, and computing a 10 billion triangle model now takes 17 days instead of 10 years. We show how to significantly accelerate the decompressor by performing the key matrix-vector product in the sparse frequency domain. We show that these methods can be used to accelerate the, We present a new subspace integration method that is capable of efficiently adding and subtracting dynamics from an existing high-resolution fluid simulation. Like wind and fire, it is also considered elemental, so it has found considerable use as a dramatic tool in visual effects. Network on Intelligent Systems, Intel; Advanced Innovation Center for Future Visual Entertainment, Beijing Film Academy; Industry Collaborations. Theodore Kim is an Associate Professor in Computer Science at Yale University, where he investigates biomechanical solids, fluid dynamics, and selected topics in geometry. Wavelet turbulence for fluid simulation. In addition, we demonstrate that we can handle complex parameterizations in reduced spaces, and advance simulations in time by integrating in the latent space with a second network. However, its relationship to the finite element method (FEM) has always been unclear, because the model resists being written as an isotropic, hyperelastic strain energy. Alan Precourt Binary Color. School of Engineering & Applied Science | Yale University17 Hillhouse Avenue • U.S. Mail: P.O. We generate detailed fluid surfaces from coarse simulations as an independent post-process that can be applied to most particle-based fluid solvers. We demonstrate a wide range of behaviors, which include capillary waves, gravity waves, and interactions with static and dynamic obstacles, all from within a single simulation. In another departure from the Chladni plate case, the eigenvalues no longer have a natural sonic mapping, so we construct a sonification that allows us to "listen" to the eigenvectors of the fluid. Bibliometrics; Citations 0; Article Metrics. My work has appeared in over two dozen movies, and I received a 2012 SciTech Oscar. Stable neo-hookean flesh simulation. He is the recipient of the NSF CAREER Award, multiple Best Paper awards, and a Scientific and Technical Academy Award (SciTech Oscar). School of Engineering & Applied Science | Yale University 17 Hillhouse Avenue • U.S. Mail: P.O. In order to robustly capture these visual characteristics, we present a novel version of Neo-Hookean elasticity. These problems usually arise when it becomes ambiguous which kinematic surface the skin should be sliding along. In this paper, we show that, Simulation artists frequently work with characters that self-intersect. and Ph.D. from the University of North Carolina, Chapel Hill. Theodore Kim Yale University. Previously, he was a Senior Research Scientist at Pixar Animation Studios, where he designed and implemented many of the solid mechanics algorithms described here. He is the recipient of the NSF CAREER Award, multiple Best Paper awards, and a Scientific and Technical Academy Award (SciTech Oscar). The results appear to be in agreement with experimental data. Third, we show that by adding an advection term, the simulation can be coupled to a fluid simulation to produce visually appealing flows. Pulling portions of the mesh generates lively motion using only a small number of dynamic nodes. We demonstrate our algorithm on several simulated and recorded natural phenomena, including river streams and lava flows. We discuss our strategies for using these techniques, which provides us with valuable information that is needed to handle challenging scenarios. For rendering, we use a convolution kernel to produce results competitive with Monte Carlo ray tracing. Many strategies exist for optimizing non-linear distortion energies in geometry and physics applications, but devising an approach that achieves the convergence promised by Newton-type methods remains challenging. We show that the resulting mesh is useful a test case for a distributed renderer. It is a connected subset of the plane with interior (in fact it tiles the plane) but the interior is disconnected. Additionally, we propose a constrained restart method that deals with local minima, and a sheathing approach that further reduces the weight of the shape. Jeff Lait Side Effects Software Inc. Kim B. Larsen Dimension Design, Kulturtanken. Second, we propose an anisotropy embedding that significantly expands the space of possible patterns that can be generated. Theodore Kim is an Associate Professor of Computer Science are Yale University. In marked contrast to subspace approaches, ConJac gives exactly the same configuration as the full space approach once the static state is reached. Theodore Kim Yale University Verified email at yale.edu. Rob Pieké SideFX. I research topics in physics-based simulation, including fire, water, and humans. Previously, he was a Senior Research Scientist at Pixar Animation Studios. Instead of solving the Navier-Stokes equations over a highly refined mesh, we use the wavelet decomposition of a low-resolution simulation to determine the location and energy characteristics of missing high-frequency components. The intricate shapes and sounds that arise from vibrating Chladni plates are a well-known phenomenon. Each technique maps to one of the three stages of solidification. When he was in high school in the late 1990s, Theodore Kim liked art and he liked computers, but wasn’t sure how to connect the two interests. Simulating dynamic deformation has been an integral component of Pixar's storytelling since Boo's shirt in Monsters, Inc. (2001). ACKNOWLEDGMENTS So many have been so wonderful. Second, a static caching scheme that eliminates roughly 99% of the random lookups in the advection stage. Nicholas J. Weidner (Texas A&M University), Theodore Kim (Yale University), Shinjiro Sueda (Texas A&M University) Multi-resolution Clustering for Enhanced Elastic Behavior in Clustered Shape Matching Aditya Viswanathan Kaliappan (University of Maryland, Baltimore County), Adam Wade Bargteil (University of Maryland, Baltimore County) Towards Animating Virtual Humans in Flooded … The new energy fits completely within our analysis, so closed-form expressions are obtained for its eigensystem as well. Previous approaches to this "up-resing" problem have focused on increasing the turbulence of the underlying velocity field. Laplacian instability is the physical mechanism that drives pattern formation in many disparate natural phenomena. Domin Lee Dreamworks Animation. At its core, our approach utilizes the invariants of the stretch tensor that arises from the polar decomposition of the deformation gradient. Theodore Kim Yale University Verified email at yale.edu. Secondly, we use our analysis to.