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Geometry is the core of the IGG group (Computer Graphics and Geometry) activity as in others national and international computer graphics research groups. Within IGG, all researchers share the same vision of objects representation. This vision separates the topological representation, or more generally the combinatorial aspects, and the embedding representation to define the geometry. This vision is the source of originality and strength of the research whithin the group.

Researchs, within the group, explore geometry and its involvement in shape modeling with adaptive combinatorial models, multiresolutions, embedded with subdivision surfaces. Tactics for formal specification, resolution of geometrical constraints systems and geometry proofs are also developped. It leads to new problems for rendering and interaction in virtual environments and finds its applications in medical simulation, currently supported with the IHU MIX-Surg project where IGG group is an active participant.

The IGG group wants to define efficient geometric models, taking into account a wide range of data (constraints, medical imaging, digitization, motion capture), to conceive, reproduce the shape, appearance and movement of 3D objects for visualisation and interaction. This purpose is articulated around three complementary themes :

• Modeling and Acquisitions : shapes, appearance and animation

• Formal specifications, constraints resolutions and proofs and constructions in geometry

• Visualization and Interactions in virtual environments

Keywords : computer science, shape modeling, proofs and specifications, virtual reality, rendering

History

IGG group is the first computer science research group of Strasbourg. Jean-François Dufourd and Jean Françon are at the origin of its creation during the eighties. In 1984, the team gave birth to the Computer Science Research Center (CRI, JE CNRS 91-92) which joined the LSIT (URA CNRS 1207) to form the LSIIT (URA CNRS 1871) in 1994, under the direction of Pierre-Louis Wendel.

During the nineties, the research group was already well known for its pioneering research lead by a dozen of teniors. Then, an almost complete renewal of its members occured. Many researchers integrated laboratories in Poitiers (Eric Andrès PR, Yves Bertrand PR, Laurent Fuchs AP, Pascal Lienhardt PR), in Limoges (Djamchid Ghanzanfarpour PR) and Clermont-Ferrand (Jean-Pierre Réveilles PR). The discrete geometry and mathematical morphology thematics of the group has been reassigned to the MIV group of the LSIIT. More recently, Jean-Michel Dischler came back from Limoges to become professor of the group in 2001 and 8 new assistant professors have been integrated during the 2000s; 3/4 of them didn't defend their Ph.D. within the LSIIT and come from the LJK (Grenoble), the LIRIS (Lyon) and the INRIA (Nancy, Nice, Orsay).