Modélisation d'objets déformables avec un système de particules orientées

Jean-Christophe Lombardo 1
1 iMAGIS - Models, Algorithms and Geometry for Computer Generated Image Graphics
GRAVIR - IMAG - Graphisme, Vision et Robotique, Inria Grenoble - Rhône-Alpes
Abstract : The study takes place in a context of physically-based computer animation. We present a new model of deformable objects based on oriented particle systems. We also present a method to automatically generate deformable objects from 3D data which have the same structure as medical data (scanners, MRI). Originally introduced to render stochastic objects, particle systems are now used in a wide range of applications. Oriented particle systems were designed as a dynamic modelling tool for describing 3D free-form objects. We present a new solution for the particle oscillations problem. We designed a new attraction/repulsion interaction, that we called `cohesion force', better adapted to numerical integration of dynamic laws than commonly used ones. This solution is applicable to both oriented or non particle systems. We present a new method using oriented particle systems to dynamically simulate 3D deformable objects that may either be restored to their initial shape or break during animations. This method can be used in a physically based animation system. We propose new anisotropic interaction laws which allow us to ensure local mathematical properties of modelled surfaces (such as curvature). We also present an extension of this model. We use oriented particles to handle skeletons of an implicit surface. We also present a reconstruction algorithm of 3D objects. We automatically create a deformable model of an object given by a potential field and an isovalue of this field. According to a small number of user parameters such as the density of the resulting sampling, we create oriented particles and interaction functions to model the surface of the object. The use of oriented particles enables us to adapt the sampling to the local curvature. Finally, we propose a method to model a muscle with oriented particles. Interaction laws are defined in order to simulate muscle behavior, in particular the forces produced as well as the shape variation.
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Jean-Christophe Lombardo. Modélisation d'objets déformables avec un système de particules orientées. Interface homme-machine [cs.HC]. Université Joseph-Fourier - Grenoble I, 1996. Français. ⟨tel-00005000⟩

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