title: Fluid simulation with articulated bodies.
abstract: We present an algorithm for creating realistic animations of characters that are swimming through fluids. Our approach combines dynamic simulation with data-driven kinematic motions (motion capture data) to produce realistic animation in a fluid. The interaction of the articulated body with the fluid is performed by incorporating joint constraints with rigid animation and by extending a solid/fluid coupling method to handle articulated chains. Our solver takes as input the current state of the simulation and calculates the angular and linear accelerations of the connected bodies needed to match a particular motion sequence for the articulated body. These accelerations are used to estimate the forces and torques that are then applied to each joint. Based on this approach, we demonstrate simulated swimming results for a variety of different strokes, including crawl, backstroke, breaststroke, and butterfly. The ability to have articulated bodies interact with fluids also allows us to generate simulations of simple water creatures that are driven by simple controllers.
authors.affiliation: Stanford University, Stanford, CA 94305-9020, USA. kwatra@stanford.edu
authors.forename: Nipun
authors.initials: N
authors.lastname: Kwatra
authors.forename: Chris
authors.initials: C
authors.lastname: Wojtan
authors.forename: Mark
authors.initials: M
authors.lastname: Carlson
authors.forename: Irfan
authors.initials: I
authors.lastname: Essa
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Mucha
authors.forename: Greg
authors.initials: G
authors.lastname: Turk
mesh_terms: D003196:Computer Graphics; D003198:Computer Simulation; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods*; D007596:Joints / Q000502:physiology*; D008954:Models, Biological; D012212:Rheology / Q000379:methods*; D013550:Swimming / Q000502:physiology*