| 基于自适应光子发射的渐进式光子映射 |
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| 引用本文： | 李睿,陈彦云,刘学慧.基于自适应光子发射的渐进式光子映射[J].计算机工程与设计,2012,33(1):219-223. |
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| 作者姓名： | 李睿 陈彦云 刘学慧 |
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| 作者单位： | 1. 中国科学院软件研究所计算机科学国家重点实验室,北京100190;中国科学院研究生院,北京100049
2. 中国科学院软件研究所计算机科学国家重点实验室,北京,100190 |
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| 摘 要： | 通过对渐进式光子映射算法进行扩展,提出了一种基于自适应光子发射的渐进式光子映射算法.渐进式光子映射是一个多遍的全局光照算法,通过不断发射光子并渐进更新场景各点的光能估计能使其最终能收敛到无偏差的结果.由于渐进式光子映射完全使用密度估计来计算各点的光能,因此其收敛速度受光子分布影响较大.利用渐进式光子映射算法中固有的场景统计信息以及其多遍的特点,设计了一个自适应的光子发射策略,使得发射的光子能更多的分布在对最终绘制有效的区域,提高了原算法的绘制效率.
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| 关 键 词： | 渐进式光子映射 自适应光子发射 视点重要性 重要性采样 全局光照 |
Adaptive photon tracing based progressive photon mapping |
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| LI Rui
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CHEN Yan-yun
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LIU Xue-hui.Adaptive photon tracing based progressive photon mapping[J].Computer Engineering and Design,2012,33(1):219-223. |
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| Authors: | LI Rui CHEN Yan-yun LIU Xue-hui |
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| Affiliation: | 1(1.State Key Laboratory of Computer Science,Institute of Software,Chinese Academy of Sciences,Beijing 100190,China; 2.Graduate University,Chinese Academy of Sciences,Beijing 100049,China) |
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| Abstract: | A simple extension of progressive photon mapping for tracing photon is presented adaptively,which make the algorithm converge to the right result more quickly.Progressive photon mapping is a multi-pass global illumination algorithm.The algorithm can compute the correct radiance value at a point in the limit by tracing photons pass by pass which update the point’s radiance progressively.Progressive photon mapping totally uses density estimation to compute radiance,so its convergence rate is affected by photon distribution.According to progressive photon mapping’s inherent statistical information and its multi-pass feature,an adaptive photon tracing strategy is designed,which make a better photon distribution each pass and improve the rendering efficiency of the original algorithm. |
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| Keywords: | progressive photon mapping adaptive photon tracing visual importance important sampling global illumination |
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