Volumetric Vector-based Representation for Indirect Illumination Caching

Romain Pacanowski 1 Xavier Granier 2, 3, 4 Christophe Schlick 2, 3 Poulin Pierre 5
2 IPARLA - Visualization and manipulation of complex data on wireless mobile devices
Université Sciences et Technologies - Bordeaux 1, Inria Bordeaux - Sud-Ouest, École Nationale Supérieure d'Électronique, Informatique et Radiocommunications de Bordeaux (ENSEIRB), CNRS - Centre National de la Recherche Scientifique : UMR5800
Abstract : This paper introduces a caching technique based on a volumetric representation that captures low-frequency indirect illumination. This structure is intended for efficient storage and manipulation of illumination. It is based on a 3D grid that stores a fixed set of irradiance vectors. During preprocessing, this representation can be built using almost any existing global illumination software. During rendering, the indirect illumination within a voxel is interpolated from its associated irradiance vectors, and is used as additional local light sources. Compared with other techniques, the 3D vector-based representation of our technique offers increased robustness against local geometric variations of a scene. We thus demonstrate that it may be employed as an efficient and high-quality caching data structure for bidirectional rendering techniques such as particle tracing or Photon Mapping.
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Romain Pacanowski, Xavier Granier, Christophe Schlick, Poulin Pierre. Volumetric Vector-based Representation for Indirect Illumination Caching. Journal of Computer Science and Technology (JCST), Science Press, Beijing, China / Springer Science, Dordrecht, The Netherlands, 2010, 25 (5), pp.925-932. ⟨10.1007/s11390-010-9377-2⟩. ⟨inria-00505132v2⟩

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