inria-00341654, version 2
Compact Structures for Interactive Global Illumination on Large Cultural Objects
Romain Pacanowski
1, 2, 3Mickaël Raynaud
a, 1, 2Julien Lacoste b, 4Xavier Granier
1, 2Patrick Reuter
c, 1, 2Christophe Schlick
c, 1, 2Pierre Poulin 3
The 9th International Symposium on Virtual Reality, Archaeology and Cultural Heritage VAST (2008): Short and Project Paper (2008)
Résumé : Cultural Heritage scenes usually consist of very large and detailed 3D objects with high geometric complexity. Even the raw visualization of such 3D objects already involves a large amount of memory and computation time. When trying to improve the sense of immersion and realism by using, global illumination techniques the demand on these resources becomes prohibitive Our approach uses regular grids combined with a vector-based representation to efficiently capture low-frequency indirect illumination. A fixed set of irradiance vectors is stored in 3D textures (for complex objects) and in 2D textures (for mostly planar objects). The vector-based representation offers additional robustness against local variations of the geometry. Consequently, the grid resolution can be set independently of geometric complexity, and the memory footprint can therefore be reduced. The irradiance vectors can be precomputed on a simplified geometry. For interactive rendering, we use an appearance preserving simplification of the geometry. The indirect illumination within a grid cell is interpolated from its associated irradiance vectors, resulting in an everywhere-smooth reconstruction.
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- a – INRIA
- b – Université de Pau et des Pays de lÁdour
- c – Université de Bordeaux 2
- 1 : IPARLA (INRIA Bordeaux - Sud-Ouest)
- INRIA – CNRS : UMR5800 – École Nationale Supérieure d'Électronique, Informatique et Radiocommunications de Bordeaux (ENSEIRB) – Université Sciences et Technologies - Bordeaux I
- 2 : Laboratoire Bordelais de Recherche en Informatique (LaBRI)
- CNRS : UMR5800 – Université Sciences et Technologies - Bordeaux I – École Nationale Supérieure d'Électronique, Informatique et Radiocommunications de Bordeaux (ENSEIRB) – Université Victor Segalen - Bordeaux II
- 3 : Département d'Informatique et de Recherche Opérationnelle [Montreal] (DIRO)
- Université de Montréal
- 4 : Laboratoire Informatique de l'Université de Pau et des Pays de l'Adour (LIUPPA)
- Université de Pau et des Pays de l'Adour : EA3000
- Domaine : Informatique/Synthèse d'image et réalité virtuelle
- Versions disponibles : v1 (25-11-2008) v2 (07-04-2011)
- inria-00341654, version 2
- http://hal.inria.fr/inria-00341654
- oai:hal.inria.fr:inria-00341654
- Contributeur : Xavier Granier
- Soumis le : Jeudi 7 Avril 2011, 11:47:05
- Dernière modification le : Jeudi 7 Avril 2011, 13:47:54











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