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改进的MMLT全局照明渲染算法

Improved Multiplexed Metropolis Light Transport

  • 摘要: 针对多通路Metropolis光能传递算法(MMLT)不能很好地保证路径样本在路径空间中的连贯性,对子路径的重用率也较低的问题,提出了一种改进算法.通过先采样路径样本再从中选择的方式提高子路径重用率;然后对路径样本进行空间排序,以提高路径空间中的连贯性;最后设计了一套权值策略来决定不同采样方式所占比重.实验结果显示,该算法能够在相同条件下产生噪声更小的结果.

     

    Abstract: Aiming at the problem that multiplexed Metropolis light transport(MMLT) may not promise coherency in path space and does not reuse sub-paths, this paper introduces an improved algorithm. It firstly samples and selects sub-paths to reuse paths. Secondly, it sorts these sub-paths to explore the path coherency in the path space. Finally, it designs a set of weighting strategies to better compute weights of different sampling techniques. Experiments show that the algorithm produces less noisy results under the same conditions.

     

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