Soft shadow computation plays an important role in generating photo-realistic images. A new method of real-time all-frequency shadow rendering in 3D scenes under dynamic illumination is introduced in this paper. The non-linear wavelet approximation on the pre-computed radiance transfer matrix is used, which can help us to select the main directions sensitive to illumination of each sampling point. This approach efficiently avoids non-linear selection of the light vector in real-time rendering, and the approximation is used only once in the pre-computed phrase. We encode the resulting radiance transfer matrix into a sparse form, and store it as textures in 2D texture buffers. Meanwhile, the light vector is organized into a cube map on GPU to accelerate computation in the run-time process. This approach has been applied to render a variety of 3D scenes with soft shadows, and proved to be able to increase the relighting speed with no image quality reduction. © Springer-Verlag Berlin Heidelberg 2006.
CITATION STYLE
Wang, L., Wang, J., & Zhao, Q. (2006). GPU-based soft shadow rendering using non-linear pre-computed radiance transfer approximation. In Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) (Vol. 4270 LNCS, pp. 81–92). Springer Verlag. https://doi.org/10.1007/11890881_10
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