A Material Point Method for Viscoelastic Fluids, Foams, and Sponges

Daniel Ram, Theodore Gast, Chenfanfu Jiang, Craig Schroeder, Alexey Stomakhin, Joseph Teran, Pirouz Kavehpour We present a new Material Point Method (MPM) for simulating viscoelastic fluids, foams and sponges. We design our discretization from the upper convected derivative terms in the evolution of the left Cauchy-Green elastic strain tensor. We combine this with an Oldroyd-B […]

Posted by christopherbatty on July 31st, 2015 | Comments Off on A Material Point Method for Viscoelastic Fluids, Foams, and Sponges Posted in Deformables, Fluids

Multifarious Hierarchies of Mechanical Models for Artist Assigned Levels-of-Detail

Richard Malgat, Benjamin Gilles, David I.W. Levin, Mathieu Nesme, Francois Faure We present a new framework for artist driven level of detail in solid simulations. Simulated objects are simultaneously embedded in several, separately designed deformation models with their own independent degrees of freedom. The models are ordered to apply their deformations hierarchically, and we enforce […]

Posted by christopherbatty on June 26th, 2015 | Comments Off on Multifarious Hierarchies of Mechanical Models for Artist Assigned Levels-of-Detail Posted in Deformables

Nonlinear Material Design Using Principal Stretches

Hongyi Xu, Funshing Sin, Yufeng Zhu, Jernej Barbic The Finite Element Method is widely used for solid deformable object simulation in film, computer games, virtual reality and medicine. Previous applications of nonlinear solid elasticity employed materials from a few standard families such as linear corotational, nonlinear St.Venant-Kirchhoff, Neo-Hookean, Ogden or Mooney-Rivlin materials. However, the spaces […]

Posted by christopherbatty on June 6th, 2015 | Comments Off on Nonlinear Material Design Using Principal Stretches Posted in Deformables, Uncategorized

Stable Constrained Dynamics

Maxime Tournier, Matthieu Nesme, Benjamin Gilles, Francois Faure We present a unification of the two main approaches to simulate deformable solids, namely elasticity and constraints. Elasticity accurately handles soft to moderately stiff objects, but becomes numerically hard as stiffness increases. Constraints efficiently handle high stiffness, but when integrated in time they can suffer from instabilities […]

Posted by christopherbatty on May 28th, 2015 | Comments Off on Stable Constrained Dynamics Posted in Deformables, Rigid bodies, Shells

High-Resolution Brittle Fracture Simulation with Boundary Elements

David Hahn, Chris Wojtan We present a method for simulating brittle fracture under the assumptions of quasi-static linear elastic fracture mechanics (LEFM). Using the boundary element method (BEM) and Lagrangian crack-fronts, we produce highly detailed fracture surfaces. The computational cost of the BEM is alleviated by using a low-resolution mesh and interpolating the resulting stress […]

Posted by christopherbatty on May 19th, 2015 | Comments Off on High-Resolution Brittle Fracture Simulation with Boundary Elements Posted in Collisions, Deformables, Fracture, Rigid bodies

Continuum Foam: A Material Point Method for Shear-Dependent Flows

Yonghao Yue, Breannan Smith, Christopher Batty, Changxi Zheng, Eitan Grinspun We consider the simulation of dense foams composed of microscopic bubbles, such as shaving cream and whipped cream. We represent foam not as a collection of discrete bubbles, but instead as a continuum. We employ the Material Point Method (MPM) to discretize a hyperelastic constitutive […]

Posted by christopherbatty on May 15th, 2015 | Comments Off on Continuum Foam: A Material Point Method for Shear-Dependent Flows Posted in Deformables, Fluids, Fracture

The Affine Particle-In-Cell Method

Chenfanfu Jiang, Craig Schroeder, Andrew Selle, Joseph Teran, Alexey Stomakhin Hybrid Lagrangian/Eulerian simulation is commonplace in computer graphics for fluids and other materials undergoing large deformation. In these methods, particles are used to resolve transport and topological change, while a background Eulerian grid is used for computing mechanical forces and collision responses. Particle- in-Cell (PIC) techniques, particularly the Fluid […]

Posted by christopherbatty on May 15th, 2015 | Comments Off on The Affine Particle-In-Cell Method Posted in Deformables, Fire, Fluids

Deformation Capture and Modeling of Soft Objects

Bin Wang, Longhua Wu, Kangkang Yin, Uri Ascher, Libin Liu, Hui Huang We present a data-driven method for the deformation capture and physics-based modeling of soft deformable objects. Our framework enables both realistic motion reconstruction and synthesis of virtual soft object models in response to user stimulation. Low cost depth sensors are used for the […]

Posted by christopherbatty on May 15th, 2015 | Comments Off on Deformation Capture and Modeling of Soft Objects Posted in Deformables

Air Meshes for Robust Collision Handling

Matthias Mueller, Nuttapong Chentanez, Tae-Yong Kim, Miles Macklin We propose a new method for both collision detection and collision response geared towards handling complex deformable objects in close contact. Our method does not miss collision events between time steps and solves the challenging problem of untangling automatically and robustly. It is conceptually simple and straight […]

Posted by christopherbatty on May 14th, 2015 | Comments Off on Air Meshes for Robust Collision Handling Posted in Cloth, Collisions, Deformables

Subspace Condensation: Full Space Adaptivity for Subspace Deformations

Yun Teng, Mark Meyer, Tony DeRose, Theodore Kim Subspace deformable body simulations can be very fast, but can behave unrealistically when behaviors outside the prescribed subspace, such as novel external collisions, are encountered. We address this limitation by presenting a fast, flexible new method that allows full space computation to be activated in the neighborhood […]

Posted by christopherbatty on May 12th, 2015 | Comments Off on Subspace Condensation: Full Space Adaptivity for Subspace Deformations Posted in Collisions, Deformables
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