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Green Image
Issue No. 01 - January (2011 vol. 17)
ISSN: 1077-2626
pp: 64-73
Xin Sun , Zhejiang University and Microsoft Research Asia, Beijing
Qiming Hou , Tsinghua University, Beijing
Zhong Ren , Microsoft Research Asia, Beijing
Kun Zhou , Zhejiang University, HangZhou
Baining Guo , Microsoft Research Asia and Tsinghua University, Beijing
We present a real-time algorithm to render all-frequency radiance transfer at both macroscale and mesoscale. At a mesoscale, the shading is computed on a per-pixel basis by integrating the product of the local incident radiance and a bidirectional texture function. While at a macroscale, the precomputed transfer matrix, which transfers the global incident radiance to the local incident radiance at each vertex, is losslessly compressed by a novel biclustering technique. The biclustering is directly applied on the radiance transfer represented in a pixel basis, on which the BTF is naturally defined. It exploits the coherence in the transfer matrix and a property of matrix element values to reduce both storage and runtime computation cost. Our new algorithm renders at real-time frame rates realistic materials and shadows under all-frequency direct environment lighting. Comparisons show that our algorithm is able to generate images that compare favorably with reference ray tracing results, and has obvious advantages over alternative methods in storage and preprocessing time.
Illumination, rendering, shadow algorithm, graphics hardware.

K. Zhou, X. Sun, Q. Hou, Z. Ren and B. Guo, "Radiance Transfer Biclustering for Real-Time All-Frequency Biscale Rendering," in IEEE Transactions on Visualization & Computer Graphics, vol. 17, no. , pp. 64-73, 2010.
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