Two-way Coupling of Rigid and Deformable Bodies

We propose a framework for the full two-way coupling of rigid and deformable bodies, which is achieved with both a unified time integration scheme as well as individual two-way coupled algorithms at each point of that scheme. As our algorithm is two-way coupled in every fashion, we do not require ad hoc methods for dealing […]

Posted by christopherbatty on June 1st, 2008 | Comments Off on Two-way Coupling of Rigid and Deformable Bodies Posted in Cloth, Collisions, Deformables, Rigid bodies

Image-based Collision Detection and Response between Arbitrary Volume Objects

We present a new image-based method to process contacts between objects bounded by triangular surfaces. Unlike previous methods, it relies on image-based volume minimization, which eliminates complex geometrical computations and robustly handles deep intersections.  The surfaces are rasterized in three orthogonal directions, and intersections are detected based on pixel depth and normal orientation. Per-pixel contact […]

Posted by christopherbatty on May 30th, 2008 | Comments Off on Image-based Collision Detection and Response between Arbitrary Volume Objects Posted in Collisions, Deformables, Rigid bodies

Spline Joints for Multibody Dynamics

Spline joints are a novel class of joints that can model general scleronomic constraints for multibody dynamics based on the minimalcoordinates formulation. The main idea is to introduce spline curves and surfaces in the modeling of joints: We model 1-DOF joints using splines on SE(3), and construct multi-DOF joints as the product of exponentials of […]

Posted by christopherbatty on May 13th, 2008 | Comments Off on Spline Joints for Multibody Dynamics Posted in Rigid bodies

Bullet Physics Update

From Erwin Coumans: Bullet 2.68 adds rope, cloth, deformable volumes interacting with rigid bodies, and officlal iPhone SDK support. See http://bulletphysics.com for more info, download precompiled Windows and Mac OSX demos and iPhone video.

Posted by christopherbatty on April 20th, 2008 | Comments Off on Bullet Physics Update Posted in Cloth, Deformables, Rigid bodies

GDC Physics Tutorial

The slides for Erwin Coumans’ Game Developers Conference Physics Tutorial on parallel SPU physics are available for download and on-line here: http://www.bulletphysics.com/Bullet/wordpress/uncategorized/gdc-2008-physics-tutorial-on-parallel-game-physics-for-spu They cover parallelizing a typical collision detection and rigid body dynamics pipeline and provide links for further reading. Thanks for Erwin for the link.

Posted by christopherbatty on February 23rd, 2008 | 1 Comment Posted in Collisions, Rigid bodies

Phun

Phun is an educational, entertaining and somewhat addictive piece of software for designing and exploring 2D multi-physics simulations in a cartoony fashion. Phun

Posted by christopherbatty on February 21st, 2008 | Comments Off on Phun Posted in Collisions, Fluids, Rigid bodies

A Fast and Stable Penalty Method for Rigid Body Simulation

Two methods have been used extensively to model resting contact for rigid body simulation. The first approach, the penalty method, applies virtual springs to surfaces in contact to minimize interpenetration. This method, as typically implemented, results in oscillatory behavior and considerable penetration. The second approach, based on formulating resting contact as a linear complementarity problem, […]

Posted by christopherbatty on January 11th, 2008 | Comments Off on A Fast and Stable Penalty Method for Rigid Body Simulation Posted in Collisions, Rigid bodies

And Another Thesis

Claude Lacoursiere’s thesis on variational techniques for rigid bodies: Ghosts and Machines: regularized variational methods for interactive simulations of multibodies with dry frictional contacts

Posted by christopherbatty on October 23rd, 2007 | Comments Off on And Another Thesis Posted in Collisions, Rigid bodies

Some Theses…

Frank Losasso’s PhD thesis on fluid simulation, which contains previously unpublished work on coupling together SPH and level set based fluid simulations: Algorithms for Increasing the Efficiency and Fidelity of Fluid Simulation Eftychios Sifakis’ PhD thesis on face, muscle, speech, and surgery simulation: Algorithmic Aspects of the Simulation and Control of Computer Generated Human Anatomy […]

Posted by christopherbatty on September 26th, 2007 | Comments Off on Some Theses… Posted in Collisions, Deformables, Fluids, Fracture, Rigid bodies

Animating Corrosion and Erosion

In this paper, we present a simple method for animating natural phenomena such as erosion, sedimentation, and acidic corrosion. We discretize the appropriate physical or chemical equations using finite differences, and we use the results to modify the shape of a solid body. We remove mass from an object by treating its surface as a […]

Posted by christopherbatty on August 9th, 2007 | Comments Off on Animating Corrosion and Erosion Posted in Deformables, Fluids, Rigid bodies
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