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Green Image
Issue No. 08 - Aug. (2013 vol. 19)
ISSN: 1077-2626
pp: 1317-1330
Yubo Zhang , Dept. of Comput. Sci., Univ. of California, Davis, Davis, CA, USA
Zhao Dong , Program of Comput. Graphics, Cornell Univ., Ithaca, NY, USA
Kwan-Liu Ma , Dept. of Comput. Sci., Univ. of California, Davis, Davis, CA, USA
We present a framework for precomputed volume radiance transfer that achieves real-time rendering of global illumination effects for volume data sets such as multiple scattering, volumetric shadows, and so on. Our approach incorporates the volumetric photon mapping method into the classical precomputed radiance transfer pipeline. We contribute several techniques for light approximation, radiance transfer precomputation, and real-time radiance estimation, which are essential to make the approach practical and to achieve high frame rates. For light approximation, we propose a new discrete spherical function that has better performance for construction and evaluation when compared with existing rotational invariant spherical functions such as spherical harmonics and spherical radial basis functions. In addition, we present a fast splatting-based radiance transfer precomputation method and an early evaluation technique for real-time radiance estimation in the clustered principal component analysis space. Our techniques are validated through comprehensive evaluations and rendering tests. We also apply our rendering approach to volume visualization.
Lighting, Rendering (computer graphics), Photonics, Scattering, Real-time systems, Approximation methods, Media, volume shadow, Volume rendering, precomputed radiance transfer, volume ray casting, multiple scattering

Zhao Dong, Kwan-Liu Ma and Yubo Zhang, "Real-Time Volume Rendering in Dynamic Lighting Environments Using Precomputed Photon Mapping," in IEEE Transactions on Visualization & Computer Graphics, vol. 19, no. , pp. 1317-1330, 2013.
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