Fluid Directed Rigid Body Control Using Deep Reinforcement Learning

Yunsheng Tian, Pingchuan Ma, Zherong Pan, Bo Ren, and Dinesh Manocha We present a learning-based method to control a coupled 2D system involving both fluid and rigid bodies. Our approach is used to modify the fluid/rigid simulator’s behavior by applying control forces only at the simulation domain boundaries. The rest of the domain, corresponding to […]

Posted by christopherbatty on May 14th, 2018 | Comments Off on Fluid Directed Rigid Body Control Using Deep Reinforcement Learning Posted in Fluids, Rigid bodies

Rigid Body Contact Problems using Proximal Operators

Kenny Erleben Iterative methods are popular for solving contact force problems in rigid body dynamics. They are loved for their robustness and surrounded by mystery as to whether they converge or not. We provide a mathematical foundation for iterative (PROX) schemes based on proximal operators. This is a class of iterative Jacobi and blocked Gauss–Seidel […]

Posted by christopherbatty on July 29th, 2017 | Comments Off on Rigid Body Contact Problems using Proximal Operators Posted in Collisions, Rigid bodies

Improving the GJK algorithm for faster and more reliable distance queries between convex objects

Mattia Montanari, Nik Petrinic, and Ettore Barbieri This article presents a new version of the Gilbert-Johnson-Keerthi (GJK) algorithm that circumvents the shortcomings introduced by degenerate geometries. The original Johnson algorithm and Backup procedure are replaced by a distance subalgorithm that is faster and accurate to machine precision, thus guiding the GJK algorithm toward a shorter […]

Posted by christopherbatty on July 28th, 2017 | Comments Off on Improving the GJK algorithm for faster and more reliable distance queries between convex objects Posted in Collisions, Rigid bodies

All’s Well That Ends Well: Guaranteed Resolution of Simultaneous Rigid Body Impact

Etienne Vouga, Breannan Smith, Danny M. Kaufman, Rasmus Tamstorf, Eitan Grinspun Iterative algorithms are frequently used to resolve simultaneous impacts between rigid bodies in physical simulations. However, these algorithms lack formal guarantees of termination, which is sometimes viewed as potentially dangerous, so failsafes are used in practical codes to prevent infinite loops. We show such […]

Posted by christopherbatty on July 12th, 2017 | Comments Off on All’s Well That Ends Well: Guaranteed Resolution of Simultaneous Rigid Body Impact Posted in Collisions, Rigid bodies

Density Maps for Improved SPH Boundary Handling

Dan Koschier, Jan Bender In this paper, we present the novel concept of density maps for robust handling of static and rigid dynamic boundaries in fluid simulations based on Smoothed Particle Hydrodynamics (SPH). In contrast to the vast majority of existing approaches, we use an implicit discretization for a continuous extension of the density field […]

Posted by christopherbatty on June 30th, 2017 | Comments Off on Density Maps for Improved SPH Boundary Handling Posted in Fluids, Rigid bodies

Long Range Constraints for Rigid Body Simulations

Matthias Müller, Nuttapong Chentanez, Miles Macklin, Stefan Jeschke The two main constraints used in rigid body simulations are contacts and joints. Both constrain the motion of a small number of bodies in close proximity. However, it is often the case that a series of constraints restrict the motion of objects over longer distances such as […]

Posted by christopherbatty on June 12th, 2017 | Comments Off on Long Range Constraints for Rigid Body Simulations Posted in Rigid bodies

Geometric Stiffness for Real-time Constrained Multibody Dynamics

Sheldon Andrews, Marek Teichmann, Paul Kry This paper focuses on the stable and efficient simulation of articulated rigid body systems for real-time applications. Specifically, we focus on the use of geometric stiffness, which can dramatically increase simulation stability. We examine several numerical problems with the inclusion of geometric stiffness in the equations of motion, as […]

Posted by christopherbatty on June 12th, 2017 | Comments Off on Geometric Stiffness for Real-time Constrained Multibody Dynamics Posted in Rigid bodies

Bounce Maps: An Improved Restitution Model for Real-Time Rigid-Body Impact

Jui-Hsien Wang, Rajsekhar Setaluri, Dinesh K Pai, Doug L James We present a novel method to enrich standard rigid-body impact models with a spatially varying coefficient of restitution map, or Bounce Map. Even state-of-the art methods in computer graphics assume that for a single rigid body, post- and pre-impact dynamics are related with a single […]

Posted by christopherbatty on May 16th, 2017 | Comments Off on Bounce Maps: An Improved Restitution Model for Real-Time Rigid-Body Impact Posted in Collisions, Rigid bodies

Example-Based Expressive Animation of 2D Rigid Bodies

Marek Dvorožňák, Pierre Bénard, Pascal Barla, Oliver Wang, Daniel Sýkora We present a novel approach to facilitate the creation of stylized 2D rigid body animations. Our approach can handle multiple rigid objects following complex physically-simulated trajectories with collisions, while retaining a unique artistic style directly specified by the user. Starting with an existing target animation […]

Posted by christopherbatty on April 30th, 2017 | Comments Off on Example-Based Expressive Animation of 2D Rigid Bodies Posted in Deformables, Rigid bodies

Real-time Interactive Tree Animation

We present a novel method for posing and animating botanical tree models interactively in real time. Unlike other state of the art methods which tend to produce trees that are overly flexible, bending and deforming as if they were underwater plants, our approach allows for arbitrarily high stiffness while still maintaining real-time frame rates without […]

Posted by christopherbatty on April 21st, 2017 | Comments Off on Real-time Interactive Tree Animation Posted in Deformables, Rigid bodies
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