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Romain Pacanowski, Xavier Granier, Christophe Schlick, Pierre Poulin. Volumetric Vector-Based Representation for Indirect Illumination Caching[J]. Journal of Computer Science and Technology, 2010, 25(5): 925-932. DOI: 10.1007/s11390-010-1073-8
Citation: Romain Pacanowski, Xavier Granier, Christophe Schlick, Pierre Poulin. Volumetric Vector-Based Representation for Indirect Illumination Caching[J]. Journal of Computer Science and Technology, 2010, 25(5): 925-932. DOI: 10.1007/s11390-010-1073-8

Volumetric Vector-Based Representation for Indirect Illumination Caching

  • 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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