TY - GEN

T1 - All-frequency precomputed radiance transfer using spherical radial basis functions and clustered tensor approximation

AU - Tsai, Yu Ting

AU - Shih, Zen-Chung

PY - 2006/12/1

Y1 - 2006/12/1

N2 - 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.

AB - 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.

KW - illumination

KW - non-linear optimization

KW - precomputed radiance transfer

KW - real-time rendering

KW - spherical radial basis functions

KW - tensor approximation

UR - http://www.scopus.com/inward/record.url?scp=41349115159&partnerID=8YFLogxK

U2 - 10.1145/1179352.1141981

DO - 10.1145/1179352.1141981

M3 - Conference contribution

AN - SCOPUS:41349115159

SN - 1595933646

SN - 9781595933645

T3 - ACM SIGGRAPH 2006 Papers, SIGGRAPH '06

SP - 967

EP - 976

BT - ACM SIGGRAPH 2006 Papers, SIGGRAPH '06

T2 - ACM SIGGRAPH 2006 Papers, SIGGRAPH '06

Y2 - 30 July 2006 through 3 August 2006

ER -