Spectral Mollification for Bidirectional Fluorescence

Spectral Mollification for Bidirectional Fluorescence
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双向荧光的光谱软化

DOI:
10.1111/cgf.13937
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发表时间:
2020
影响因子:
2.5
通讯作者:
C. Dachsbacher
C. Dachsbacher
中科院分区:
计算机科学4区
文献类型:
--
作者:
A. Jung;J. Hanika;C. Dachsbacher

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荧光材料可以在不同波长之间转换能量,从而在天然和人造材料中产生明亮和饱和的颜色。然而,到目前为止,使用光谱单向方法呈现连续波长的荧光或与波长相关的路径配置相结合是可行的。我们提出了一种基于正则化的方法来支持光谱双向路径示踪剂中的荧光。我们的算法对具有独立波长的相机和光子路进行采样,当连接它们时,在其中一个连接顶点处缓和BSDF,这样它就可以跨多个波长辐射光。我们讨论了出现的问题,如早期迭代中的颜色偏差,方法的一致性和存在光谱平滑的MIS权重。我们在结合荧光和传输现象的场景中展示了我们的方法,这些现象很难用单向或光谱离散方法渲染。
Fluorescent materials can shift energy between wavelengths, thereby creating bright and saturated colors both in natural and artificial materials. However, rendering fluorescence for continuous wavelengths or combined with wavelength dependent path configurations so far has only been feasible using spectral unidirectional methods. We present a regularization‐based approach for supporting fluorescence in a spectral bidirectional path tracer. Our algorithm samples camera and light sub‐paths with independent wavelengths, and when connecting them mollifies the BSDF at one of the connecting vertices such that it reradiates light across multiple wavelengths. We discuss arising issues such as color bias in early iterations, consistency of the method and MIS weights in the presence of spectral mollification. We demonstrate our method in scenes combining fluorescence and transport phenomena that are difficult to render with unidirectional or spectrally discrete methods.
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