Simulation of Complex Nonlinear Elastic Bodies using Lattice Deformers

Taylor Patterson, Nathan Mitchell, Eftychios Sifakis Lattice deformers are a popular option for modeling the behavior of elastic bodies as they avoid the need for conforming mesh generation, and their regular structure offers significant opportunities for performance optimizations. Our work expands the scope of current lattice-based elastic deformers, adding support for a number of important simulation features. We […]

VriPhys 2012

Physics animation papers at VriPhys: An implicit Tensor-Mass solver on the GPU High-Resolution Simulation of Granular Material with SPH An Efficient Surface Reconstruction Pipeline for Particle-Based Fluids Efficient Breast Deformation Simulation Efficient Cloth Simulation Using An Adaptive Finite Element Method A Packed Memory Array To Keep Moving Particles Sorted Real-Time Hair Simulation with Efficient Hair […]

An implicit Tensor-Mass solver on the GPU for soft bodies simulation

Xavier Faure, Florence Zara, Fabrice Jaillet, Jean-Michel Moreau The realistic and interactive simulation of deformable objects has become a challenge in Computer Graphics. In this paper, we propose a GPU implementation of the resolution of the mechanical equations, using a semi-implicit as well as an implicit integration scheme. At the contrary of the classical FEM approach, forces are […]

High-Resolution Simulation of Granular Material with SPH

Markus Ihmsen, Arthur Wahl, Matthias Teschner We present an efficient framework for simulating granular material with high visual detail. Our model solves the computationally and numerically critical forces on a coarsely sampled particle simulation. We incorporate a new frictional boundary force into an existing continuum-based method which enables realistic interactions and a more robust simulation. Visual realism is […]

An Efficient Surface Reconstruction Pipeline for Particle-Based Fluids

Gizem Akinci, Nadir Akinci, Markus Ihmsen, Matthias Teschner In this paper we present an efficient surface reconstruction pipeline for particle-based fluids such as smoothed particle hydrodynamics. After the scalar field computation and the marching cubes based triangulation, we post process the surface mesh by applying surface decimation and subdivision algorithms. In comparison to existing approaches, the decimation step […]

Geometric Numerical Integration of Inequality Constrained Nonsmooth Hamiltonian Systems

Danny Kaufman, Dinesh Pai We consider the geometric numerical integration of Hamiltonian systems subject to both equality and “hard” inequality constraints. As in the standard geometric integration setting, we target long-term structure preservation. Additionally, however, we also consider invariant preservation over persistent, simultaneous, and/or frequent boundary interactions. Appropriately formulating geometric methods for these cases has […]

Interpenetration Free Simulation of Thin Shell Rigid Bodies

R. Elliot English, Michael Lentine, Ron Fedkiw We propose a new algorithm for rigid body simulation that guarantees each body is in an interpenetration free state, both increasing the accuracy and robustness of the simulation as well as alleviating the need for ad hoc methods to separate bodies for subsequent simulation and rendering. We cleanly separate collision […]

Speculative Parallel Asynchronous Contact Mechanics

Samantha Ainsley, Etienne Vouga, Eitan Grinspun, Rasmus Tamstorf We extend the Asynchronous Contact Mechanics algorithm [Harmon et al. 2009] and improve its performance by two orders of magnitude, using only optimizations that do not compromise ACM’s three guarantees of safety, progress, and correctness. The key to this speedup is replacing ACM’s timid, forward-looking mechanism for detecting collisions—locating and […]