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Modélisation et Animation de Matériaux Hautement Déformables en Synthèse d'Images

Mathieu Desbrun 1
1 iMAGIS - Models, Algorithms and Geometry for Computer Generated Image Graphics
GRAVIR - IMAG - Laboratoire d'informatique GRAphique, VIsion et Robotique de Grenoble, Inria Grenoble - Rhône-Alpes
Abstract : In this thesis, we are dealing with computer graphics modeling and animation of highly deformable materials. Our work is aimed at creating virtual physically-based models of matter, able to automatically deform due to interactions with the environment. Coping with large deformation is known to be time consuming, so efficiency and visual quality are the key issues as they can open avenues such as surgery simulation or virtual reality in general. After a review of previous related work, we present a hybrid model for highly deformable materials that combines implicit surfaces and a particle system. It results in a global model that gathers the advantages of the two approaches, and other valuable properties as volume preservation. Then we discuss conventional particle system weaknesses. An alternative model is thus proposed allowing a space-time adaptative simulation, where particles can subdivide to better discretize fast deforming areas, or merge to simplify stable regions. Computations are therefore stable and optimized as discretization is automatically adapted. Lastly, an active implicit skin model is introduced. This deformable surface can coat any deformable model both providing a neat visualization and confering physical properties such as surface tension. More generally, it offers an efficient yet low-cost technique to visualize adaptive models, avoiding “popping” effects through smoothing of sudden internal change of granularity. The new models we developed seem to promise a fully adaptive simulation of deformable objects as computations are minimized to ensure a given accuracy and focussed where needed.
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Submitted on : Friday, October 22, 2010 - 11:57:45 AM
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Mathieu Desbrun. Modélisation et Animation de Matériaux Hautement Déformables en Synthèse d'Images. Modélisation et simulation. Institut National Polytechnique de Grenoble - INPG, 1997. Français. ⟨tel-00528678⟩

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