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Theses

Amélioration de la Modélisation et de la Simulation des Vêtements en 3D

Abstract : Physically-based cloth modeling and simulation is a problem of interest for the scientific community interested in digital worlds. This thesis deals with the improvement of the mechanical modelling of fabric and with the recovering of its parameters for more realistic cloth animations.

The general context of our work is modeling warp and weft textile materials using mass-spring systems. We propose a new non linear hysteretic model for fabric shear. Our model is based on binary springs and thus, allows saving computational time (no trigonometric computations). Our model mimics precisely the mechanical shear behavior of fabric measured from Kawabata machines. The transfert functions of springs are determined in such a way that if the numerical model of fabric is submitted to the same constraints as the real fabric in the Kawabata machines, we obtain the same curves as those produced by the real Kawabata experiment.

We present also an experimental setup using motion capture system (MOCAP) to measure fabric viscosity parameters. Fabric viscosity parameters are computed using experimental data which allows to recover its damping parameters used in the Newton's equation of movement.

Finally, we validate the whole mechanical model of fabric including its viscosity parameters through an experiment where we recover the geometry of a real piece of fabric hanging on a table using computer vision techniques, and by comparing this shape to the result obtained by our simulator running on the same piece of fabric and initialized with the same (almost) conditions as in the real experiment. Our computer vision technique is based on the POSIT calibration algorithm and a 3D stereo algorithm.
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Theses
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https://tel.archives-ouvertes.fr/tel-00012182
Contributor : Hatem Charfi <>
Submitted on : Thursday, April 27, 2006 - 12:31:58 PM
Last modification on : Wednesday, December 9, 2020 - 3:13:59 PM
Long-term archiving on: : Saturday, April 3, 2010 - 11:16:13 PM

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  • HAL Id : tel-00012182, version 1

Citation

Hatem Charfi. Amélioration de la Modélisation et de la Simulation des Vêtements en 3D. Modélisation et simulation. Université Pierre et Marie Curie - Paris VI, 2006. Français. ⟨tel-00012182⟩

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