All-frequency precomputed radiance transfer using spherical radial basis functions and clustered tensor approximation

Yu Ting Tsai*, Zen-Chung Shih

*Corresponding author for this work

Research output: Contribution to journalConference article

100 Scopus citations

Abstract

This paper introduces a new data representation and compression technique for precomputed radiance transfer (PRT). The light transfer functions and light sources are modeled with spherical radial basis functions (SRBFs). A SRBF is a rotation-invariant function that depends on the geodesic distance between two points on the unit sphere. Rotating functions in SRBF representation is as straightforward as rotating the centers of SRBFs. Moreover, high-frequency signals are handled by adjusting the bandwidth parameters of SRBFs. To exploit inter-vertex coherence, the light transfer functions are further classified iteratively into disjoint clusters, and tensor approximation is applied within each cluster. Compared with previous methods, the proposed approach enables real-time rendering with comparable quality under high-frequency lighting environments. The data storage is also more compact than previous all-frequency PRT algorithms.

Original languageEnglish
Pages (from-to)967-976
Number of pages10
JournalACM Transactions on Graphics
Volume25
Issue number3
DOIs
StatePublished - 1 Jul 2006
EventACM SIGGRAPH 2006 - Boston, MA, United States
Duration: 30 Jul 20063 Aug 2006

Keywords

  • Illumination
  • Non-linear optimization
  • Precomputed Radiance Transfer
  • Real-Time Rendering
  • Spherical Radial basis functions
  • Tensor approximation

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