Participated in the development of a relighting tool.

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Participated in the development, from scratch, of a full Non-Photorealistic Rendering pipeline for animation production. Development under Windows using C++, Boost, OpenGL/Cg.

Importance sampling with frame-to-frame coherence

Shader system

Stroke ordering

Researched and developed an ordering algorithm for strokes to properly depict occlusion in the context of painterly rendering and to maximize frame-to-frame coherence. Primary inventor on two patents related to this work.

Miscellaneous

Participated in the production of two short movies. Responsible for translating artistic styles into technical strategies.

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Doctoral thesis supervised by François Sillion within the ARTIS/GRAVIR team at INRIA. Collaboration with Frédo Durand at MIT.

Procedural shaders for rendering of line drawings from 3D

Researched and developed a shader system to encapsulate the drawing process and allows for flexible 3D rendering of stylized line drawings. In this approach, artists' styles are desribed in shaders. All useful information from the 3D scene is available to the user through the shader context. Shaders are written in Python and are run within a C++ application. Released Freestyle, an open source distribution of the software developed as the experimentation platform for this research. This work was done in collaboration with Professor Frédo Durand from MIT and led to two refereed publications.

Image-based reconstruction of hair geometry by Inverse Lighting

Researched and developed algorithms to reconstruct geometry of hair from a sequence of photographs showing the hair under varying lighting conditions. The highly specular nature of hair, which prevents proper acquisition by 3D scanners, makes it possible to retrieve the geometry of hair by analyzing the pictures against a hair reflectance model. This work was done in collaboration with Steven Marschner from Cornell University and Jed Lengyel from Microsoft Research and resulted in a refereed publication.

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Visited the MIT graphics group for a total of seven months to collaborate with Professor Frédo Durand on the shader system for line drawing rendering, started at INRIA. Funded by a EURODOC grant.

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Participated in the development of the interactive visualization engine of CATIA V5. Development under Windows and Solaris UNIX using C++, OpenGL.

Silhouette display

Implemented a solution for interactive computation and visualization of visible silhouette lines on polygonal meshes.

VRML

Implemented the VRML import/export module.

Vocal user interface

Developed a prototype vocal user interface allowing full piloting of CATIA through speech. Development under Windows in C++ using Microsoft COM-based SAPI.

Miscellaneous

Maintenance of existing visualization code on both CATIA V4 and V5. Daily control of code quality in terms of memory usage, performance and coverage.

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Worked on the real-time driving simulator 'Ville' developed at the iMAGIS/GRAVIR laboratory and based on the computation of impostors for faster display of distant geometry. Development in C++ and OpenGL on Windows and IRIX. Supervised by François Sillion.

HP graphics card stress test

Designed and implemented a test suite around 'Ville' to stress test an HP prototype graphics card dedicated to high end graphics application.

Client/server implementation

Implemented a client/server version of 'Ville' where the server side manages data and computes impostors and the client side displays the geometry and handles user interactions.

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Participated in the production of a company commercial involving augmented reality for the French car manufacturer Renault.

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Freestyle is a software for Non-Photorealistic Line Drawing rendering from 3D scenes. It is designed as a programmable interface to allow maximum control over the style of the final drawing: the user "programs" how the silhouettes and other feature lines from the 3D model should be turned into stylized strokes using a set of programmable operators dedicated to style description. This programmable approach, inspired by the shading languages available in photorealistic renderers such as Pixar's RenderMan, overcomes the limitations of integrated software with access to a limited number of parameters and permits the design of an infinite variety of rich and complex styles. The system currently focuses on pure line drawing as a first step. The style description language is Python augmented with our set of operators. Freestyle was developed in the framework of a research project dedicated to the study of stylized line drawing rendering from 3D scenes. Details about this research can be found at: http://artis.imag.fr/Projects/Style. This software is distributed under the terms of the GPL License.

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Optics101 is a small application written in Flash to help visualize and understand some of the basic concepts in photography such as focal length, aperture, focus distance, depth of field, circle of confusion (it won't help understand shutter speed or exposure though). It is using an ideal thin lens model to simulate camera lenses (which is a pretty crude approximation obviously). It is very basic but I found it useful while I was learning photography. Try it here. Please email me any comment, this is still a work in progress.

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