A null-scattering path integral formulation of light transport

A null-scattering path integral formulation of light transport
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光传输的零散射路径积分公式

DOI:
10.1145/3306346.3323025
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发表时间:
2019
影响因子:
6.2
通讯作者:
Jarosz, Wojciech
Jarosz, Wojciech
中科院分区:
计算机科学1区
文献类型:
--
作者:
Miller, Bailey;Georgiev, Iliyan;Jarosz, Wojciech

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无偏渲染的一般,异质参与媒体目前需要使用零碰撞的方法来估计透射率和生成自由飞行距离。然而,这些方法的一个长期存在的限制是,由于零冲突拒绝采样过程的黑盒性质,无法计算相应的路径PDF。因此,这些技术不能通过多重重要性采样(MIS)与其他采样技术相结合,这大大限制了它们的鲁棒性和通用性。最近,Galtier等人[2013]展示了如何直接从辐射传输方程(RTE)导出这些算法。我们建立了这个广义的RTE,以获得apath integralformulation的零散射,它揭示了采样PDF,并允许我们设计新的,表达现有的,并通过MIS联合收割机互补无偏技术。我们证明了我们的理论的实用性相结合,第一次,几个路径采样技术在空间和光谱变化的媒体,概括和优于现有技术。
Unbiased rendering of general, heterogeneous participating media currently requires using null-collision approaches for estimating transmittance and generating free-flight distances. A long-standing limitation of these approaches, however, is that the corresponding path pdfs cannot be computed due to the black-box nature of the null-collision rejection sampling process. These techniques therefore cannot be combined with other sampling techniques via multiple importance sampling (MIS), which significantly limits their robustness and generality. Recently, Galtier et al. [2013] showed how to derive these algorithms directly from the radiative transfer equation (RTE). We build off this generalized RTE to derive apath integralformulation of null scattering, which reveals the sampling pdfs and allows us to devise new, express existing, and combine complementary unbiased techniques via MIS. We demonstrate the practicality of our theory by combining, for the first time, several path sampling techniques in spatially and spectrally varying media, generalizing and outperforming the prior state of the art.
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