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The core business of IGG research group (https://lsiit.u-strasbg.fr/igg-en) of the LSIIT Lab at the University of Strasbourg is geometric modeling conjugated under all its aspects: modeling, construction and proofs in geometry. The Geometric and topological modeling sub-team studies the combinatorial models which are the common basis for the whole team. Some people also work on the solving of geometric constraints which is a complementary point of view, especially the embeddings. And finally the "Specifications and proofs in geometry" topic makes geometric modeling benefit from the latest advances in specifications and proofs. The other theme of the group is "Visualization, Interaction and Simulation". It splits in two operations - "Simulation, visualization and rendering" and "3D Interaction" - which are complementary in the sense that simulations require both interaction and visualization.

IGG group is the first research group in computer science - associated to the CNRS - that was created in Strasbourg by Jean-François Dufourd and Jean Françon, more than twenty years ago.

Since fifteen years this research group is composed of about ten teniors. In 10 years, since Dominique Bechmann came at its head, the group has been almost completey renewed : only Dominique Bechmann, Jean-François Dufourd and Pascal Schreck - who were associate professors (AP) at the time - were already in the team in 1997. Several events, such as the departure of many researchers for laboratories in Poitiers (Eric Andrès PR, Yves Bertrand PR, Laurent Fuchs AP, Pascal Lienhardt PR), Limoges (Djamchid Ghanzanfarpour PR) and Clermont-Ferrand (Jean-Pierre Réveilles PR), and such as the integration of discrete geometry and mathematical morphology in the MIV group, the return of Jean-Michel Dischler from Limoges on a professor (PR) position in 2001, and the hiring of eight new associate professors, have largely recomposed this team and redrawn its scientific contours.

Since the last evaluation in 2003, IGG's group has recentered its research activities around its core business : geometric modeling, which is now conjugated under all its aspects. It is more precisely the topic of Theme 1 - modeling, construction and proofs in geometry - to which the four professors and five associate professors participate. Moreover, Sylvain Thery - research engineer from the Ministery, hired in 2005 - works on a transversal project related to the operations of this theme through the conception and implementation of a geometric modeling software platform.

Also, the program RéVA allowed the group to consolidate its expertise in virtual reality and simulation. Theme 2 - visualization, interaction and simulation - focuses on those more recent topics which involve three of the four professors of the group and five of its associate professors. A virtual reality device - of workbench type - welcomes the developments of this theme's participants. In 2007 the hiring of Olivier Genevaux, a CNRS research engineer contributed to ensure the continued existence of this theme thanks to the ressources' centralization, especially through the development of a virtual reality software platform and its scientific applications focused on medical applications.