Reconstructing Personalized Anatomical Models for Physics-based Body Animation

Petr Kadlecek, Alexandru-Eugen Ichim, Tiantian Liu, Ladislav Kavan, Jaroslav Krivanek We present a method to create personalized anatomical models ready for physics-based animation, using only on a set of surface 3D scans. We start by building a template anatomical model of an average male which supports deformations due to both 1) subject-specific variations: shapes and sizes of bones, muscles, […]

Posted by christopherbatty on October 11th, 2016 | Comments Off on Reconstructing Personalized Anatomical Models for Physics-based Body Animation Posted in Deformables, Rigid bodies

SMASH: Physics-guided Reconstruction of Collisions from Videos

Aron Monszpart, Nils Thuerey, Niloy J. Mitra Collision sequences are commonly used in games and entertainment to add drama and excitement. Authoring even two body collisions in the real world can be difficult, as one has to get timing and the object trajectories to be correctly synchronized. After tedious trial-and-error iterations, when objects can actually be made […]

Posted by christopherbatty on October 6th, 2016 | Comments Off on SMASH: Physics-guided Reconstruction of Collisions from Videos Posted in Collisions, Rigid bodies

Hierarchical hp-Adaptive Signed Distance Fields

Dan Koschier, Crispin Deul, Jan Bender In this paper we propose a novel method to construct hierarchical $hp$-adaptive Signed Distance Fields (SDFs). We discretize the signed distance function of an input mesh using piecewise polynomials on an axis-aligned hexahedral grid. Besides spatial refinement based on octree subdivision to refine the cell size (h), we hierarchically increase […]

Posted by christopherbatty on June 23rd, 2016 | Comments Off on Hierarchical hp-Adaptive Signed Distance Fields Posted in Collisions, Rigid bodies

Example-Based Plastic Deformation of Rigid Bodies

Ben Jones, Nils Thuerey, Tamar Shinar, Adam W. Bargteil Physics-based animation is often used to animate scenes containing destruction of near-rigid, man-made materials. For these applications, the most important visual features are plastic deformation and fracture. Methods based on continuum mechanics model these materials as elastoplastic, and must perform expensive elasticity computations even though elastic […]

Posted by christopherbatty on April 28th, 2016 | Comments Off on Example-Based Plastic Deformation of Rigid Bodies Posted in Deformables, Rigid bodies

Fast approximations for boundary element based brittle fracture simulation

David Hahn, Chris Wojtan We present a boundary element based method for fast simulation of brittle fracture. By introducing simplifying assumptions that allow us to quickly estimate stress intensities and opening displacements during crack propagation, we build a fracture algorithm where the cost of each time step scales linearly with the length of the crack-front. […]

Posted by christopherbatty on April 27th, 2016 | Comments Off on Fast approximations for boundary element based brittle fracture simulation Posted in Fracture, Rigid bodies

A Semi-Implicit Material Point Method for the Continuum Simulation of Granular Materials

Gilles Daviet, Florence Bertails-Descoubes We present a new continuum-based method for the realistic simulation of large-scale free-flowing granular materials. We derive a compact model for the rheology of the material, which accounts for the exact nonsmooth Drucker-Prager yield criterion combined with a varying volume fraction. Thanks to a semi-implicit timestepping scheme and a careful spatial […]

Posted by christopherbatty on April 26th, 2016 | Comments Off on A Semi-Implicit Material Point Method for the Continuum Simulation of Granular Materials Posted in Collisions, Fluids, Rigid bodies

Quadratic Contact Energy Model for Multi-Impact Simulation

Tianxiang Zhang, Sheng Li, Guoping Wang, Dinesh Manocha, Hanqiu Sun Simultaneous multi-impact simulation is a challenging problem in modeling collision for rigid bodies. There are several physical criteria for an ideal model of rigid body collision, but existing models generally fail to meet one or more of them. In order to reveal the inner process […]

Posted by christopherbatty on October 16th, 2015 | Comments Off on Quadratic Contact Energy Model for Multi-Impact Simulation Posted in Rigid bodies

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

Simulating Rigid Body Fracture with Surface Meshes

Yufeng Zhu, Robert Bridson, Chen Greif We present a new brittle fracture simulation method based on a boundary integral formulation of elasticity and recent explicit surface mesh evolution algorithms. Unlike prior physically-based simulations in graphics, this avoids the need for volumetric sampling and calculations, which aren’t reflected in the rendered output. We represent each quasi-rigid […]

Posted by christopherbatty on May 15th, 2015 | Comments Off on Simulating Rigid Body Fracture with Surface Meshes Posted in Collisions, Fracture, Rigid bodies
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