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Volumetric Vector-Based Representation
for Indirect Illumination Caching

Romain Pacanowski, Xavier Granier, Christophe Schlick, and Pierre Poulin
Journal of Computer Science and Technology, 25(5):925-932, Sept. 2010


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 others 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.


Caching for global illumination, photon mapping, particle tracing.

BibTeX entry

  title     = "Volumetric Vector-Based Representation for Indirect Illumination Caching",
  author    = "Romain Pacanowski and Xavier Granier and Christophe Schlick and Pierre Poulin",
  journal   = "Journal of Computer Science and Technology",
  year      = 2010,
  month     = sep,
  volume    = 25,
  number    = 5,
  pages     = "925--932"

Online version

Adobe PDF version of the paper
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