CUDA-accelerated simulation of multiple scattering using decoupling approximation |
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Authors: | Zheng Gong Luis Diago Ichiro Hagiwara |
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Institution: | (1) Department of Mechanical Science and Engineering, Tokyo Institute of Technology, Tokyo 152-8550, Japan |
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Abstract: | Abstract In this research a CUDA-accelerated simulation method of multiple scattering in dense participating media based on decoupling
approximation is proposed. Simulation of multiple scattering is important, in that it visually illustrates how radiance transfers
between gaseous particles. The existing radiance transfer equation has poor computational performance because of its complicated
integral calculation of in-scattering in each radiance update. However, this computation can be avoided using previous cached
results proposed in this paper. To construct the cached results, we first decouple the phase function in radiance transfer
equation with singular value decomposition (SVD) approximation. SVD approximates the multivariate phase function as a sum
of products of incident light and outgoing light of lower dimensionality. Then the incident light and outgoing light data
of current radiance update are cached independently in two textures. The cached two textures are used to replace integral
calculation of in-scattering in the next radiance update to improve computation performance. The proposed method is designed
in a parallelized way so that the parallel computing power of CUDA can be fully exploited. The simulation results show that
our method allows fast rendering of dynamic scenes while high accuracy is maintained. |
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Keywords: | |
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