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James F. O'Brien

Computer graphics, simulation, artificial intelligence, perception, privacy, and image forensics.

Dr. James F. O'Brien is a Professor of Computer Science at the University of California, Berkeley. His research interests include computer graphics, computer animation, simulations of physical systems, human perception, rendering, image synthesis, machine learning, virtual reality, digital privacy, and the forensic analysis of images and video.

In addition to his research pursuits, Prof. O'Brien has worked with film and game companies on integrating advanced simulation physics into games and special effects. His methods for destruction modeling have been used in over 200 feature films and game titles. Prof. O'Brien was Chief Scientist at Pixelux and Avametric, and is currently a technical advisor to Juice Labs and Chief Scientist/co-founder at Get Klothed. He has also served as an expert witness or consulting expert in multiple patent cases.

In 2015 the Academy of Motion Picture Arts and Sciences recognized his work in destruction modeling with an Academy Award for Technical Achievement. In 2000 he received his doctorate from the Georgia Institute of Technology where his thesis received the College of Computing's Outstanding Doctoral Dissertation Award. Professor O'Brien is a Sloan Fellow, recipient of the Jim and Donna Gray Endowment Award for Excellence in Undergraduate Teaching, and FIU College of Engineering Distinguished Alumni. He was selected as one of Technology Review's TR-35, awarded Georgia Tech's 15 Year Impact award, and received research fellowships from the Okawa and Hellman Foundations. From 2010 through 2016 he served as Director at Large for ACM SIGGRAPH. In 2020 he received an award for Technical Achievement from Dreamworks Animation.

Highlights

Images from current and past research projects

Modal Analysis for Real-Time Viscoelastic Deformation thumbnail Interpolating and Approximating Implicit Surfaces from Polygon Soup thumbnail Effect of Duration and Delay on the Identifiability of VR Motion thumbnail Modeling and Perception of Deformable One-Dimensional Objects thumbnail Simultaneous Coupling of Fluids and Deformable Bodies thumbnail Truth in Motion: The Unprecedented Risks and Opportunities of Extended Reality Motion Data thumbnail Fluid Animation with Dynamic Meshes thumbnail Image Based Rendering and Illumination Using Spherical Mosaics thumbnail KBody: Towards general, robust, and aligned monocular whole-body estimation thumbnail Simulation of Needle Insertion and Tissue Deformation for Modeling Prostate Brachytherapy thumbnail Making Big Things Look Small: Blur combined with other depth cues affects perceived size and distance thumbnail Modelling with Implicit Surfaces that Interpolate thumbnail Generating Surface Crack Patterns thumbnail Repurposing Hand Animation for Interactive Applications thumbnail Bringing Clothing into Desired Configurations with Limited Perception thumbnail Generating Surface Crack Patterns thumbnail Implicit Surfaces that Interpolate thumbnail Seeing Is Believing: Do People Fail to Identify Fake Images on the Web? thumbnail A semi-Lagrangian contouring method for fluid simulation thumbnail Simultaneous Coupling of Fluids and Deformable Bodies thumbnail Liquid Simulation on Lattice-Based Tetrahedral Meshes thumbnail Skeletal Parameter Estimation from Optical Motion Capture Data thumbnail Exposing Photo Manipulation with Inconsistent Reflections thumbnail Optimal Presentation of Imagery with Focus Cues on Multi-Plane Displays thumbnail Refolding Planar Polygons thumbnail Motion Synthesis from Annotations thumbnail The Perception of Surface Material from Disparity and Focus Cues thumbnail Berkeley Open Extended Reality Recordings 2023 (BOXRR-23): 4.7 Million Motion Capture Recordings from 105,000 XR Users thumbnail Radiance Caching and Local Geometry Correction thumbnail Results of the 2023 Census of Beat Saber Users: Virtual Reality Gaming Population Insights and Factors Affecting Virtual Reality E-Sports Performance thumbnail Can 3D Shape be Estimated from Focus Cues Alone? thumbnail Spectral Surface Reconstruction from Noisy Point Clouds thumbnail Fast and Deep Deformation Approximations thumbnail Refolding Planar Polygons thumbnail Exposing Photo Manipulation with Inconsistent Shadows thumbnail Monocular Facial Performance Capture Via Deep Expression Matching thumbnail Do Geometric Models Affect Judgments of Human Motion? thumbnail Deep Motion Masking for Secure, Usable, and Scalable Real-Time Anonymization of Ecological Virtual Reality Motion Data thumbnail A Method for Animating Viscoelastic Fluids thumbnail Synthesizing sounds from rigid-body simulations thumbnail Animating Fracture thumbnail Fast Simulation of Mass-Spring Systems thumbnail Animating Sand, Mud, and Snow thumbnail This photograph has been altered: Testing the effectiveness of image forensic labeling on news image credibility thumbnail Animating Explosions thumbnail An Energy-Driven Approach to Linkage Unfolding thumbnail Skeletal Parameter Estimation from Optical Motion Capture Data thumbnail An Energy-Driven Approach to Linkage Unfolding thumbnail Robo-Saber: Generating and Simulating Virtual Reality Players thumbnail Combining Active and Passive Simulations for Secondary Motion thumbnail Perception of Human Motion with Different Geometric Models thumbnail Dynamic Simulation of Splashing Fluids thumbnail Self-Refining Games using Player Analytics thumbnail Optimization of HDR brachytherapy dose distributions using linear programming with penalty costs thumbnail Animating Sand, Mud, and Snow thumbnail Dynamic Local Remeshing for Elastoplastic Simulation thumbnail Example-Based Wrinkle Synthesis for Clothing Animation thumbnail A Method for Cartoon-Style Rendering of Liquid Animations thumbnail Synthesizing Sounds from Physically Based Motion thumbnail Near-exhaustive Precomputation of Secondary Cloth Effects thumbnail View-Dependent Adaptive Cloth Simulation with Buckling Compensation thumbnail Correct blur and accommodation information is a reliable cue to depth ordering. thumbnail Effect of Data Degradation on Motion Re-Identification thumbnail Perceptually Based Tone Mapping for Low-Light Conditions thumbnail A semi-Lagrangian contouring method for fluid simulation thumbnail Seeing Is Believing: How People Fail to Identify Fake Images on the Web thumbnail A Texture Synthesis Method for Liquid Animations thumbnail Graphical Modeling and Animation of Ductile Fracture thumbnail KBody: Balanced monocular whole-body estimation thumbnail Interactive Simulation of Surgical Needle Insertion and Steering thumbnail Updated Sparse Cholesky Factors for Corotational Elastodynamics thumbnail Exploring the Privacy Risks of Adversarial VR Game Design thumbnail Fake images: The effects of source, intermediary, and digital media literacy on contextual assessment of imag credibility online thumbnail Automatic Joint Parameter Estimation from Magnetic Motion Capture Data thumbnail Data-Driven Elastic Models for Cloth: Modeling and Measurement thumbnail Exposing Photo Manipulation from Shading and Shadows thumbnail Fast and Detailed Approximate Global Illumination by Irradiance Decomposition thumbnail Animating Gases with Hybrid Meshes thumbnail Simulation of Subseismic Joint and Fault Networks Using a Heuristic Mechanical Model thumbnail Resampling Adaptive Cloth Simulations onto Fixed-Topology Meshes thumbnail Spectral Watertight Surface Reconstruction thumbnail Unique Identification of 50,000+ Virtual Reality Users from Head and Hand Motion Data thumbnail Pushing People Around thumbnail Approximate {svBRDF} Estimation From Mobile Phone Video thumbnail Real-Time Deformation and Fracture in a Game Environment thumbnail Animating Suspended Particle Explosions thumbnail Exposing Digital Forgeries in Ballistic Motion thumbnail A Texture Synthesis Method for Liquid Animations thumbnail View-Dependent Adaptive Cloth Simulation thumbnail Animating Human Athletics thumbnail Using Blur to Affect Perceived Distance and Size thumbnail Adaptive Tearing and Cracking of Thin Sheets thumbnail Inferring Private Personal Attributes of Virtual Reality Users from Ecologically Valid Head and Hand Motion Data thumbnail Fast and Deep Facial Deformations thumbnail Folding and Crumpling Adaptive Sheets thumbnail Interactive Deformation Using Modal Analysis with Constraints thumbnail Fluids in Deforming Meshes thumbnail Graphical Modeling and Animation of Brittle Fracture thumbnail Modeling the Accumulation of Wind-Driven Snow thumbnail Shape Transformation Using Variational Implicit Functions thumbnail Interactive Detailed Cutting of Thin Sheets thumbnail Simulating Liquids and Solid-Liquid Interactions with Lagrangian Meshes thumbnail Multi-Resolution Isotropic Strain Limiting thumbnail Adaptive Anisotropic Remeshing for Cloth Simulation thumbnail Combining Active and Passive Simulations for Secondary Motion thumbnail Refolding Planar Polygons thumbnail Computational Studies of Human Motion: Tracking and Motion Synthesis thumbnail