Spectral Mollification for Bidirectional Fluorescence

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...

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Bibliographic Details
Published in:Computer graphics forum Vol. 39; no. 2; pp. 373 - 384
Main Authors: Jung, A., Hanika, J., Dachsbacher, C.
Format: Journal Article
Language:English
Published: Oxford Blackwell Publishing Ltd 01.05.2020
Subjects:
Algorithms
Apexes
CCS Concepts
Computing methodologies → Ray tracing
Fluorescence
Reflectance modeling
Regularization
Spectra
Transport phenomena
Wavelengths
ISSN:0167-7055, 1467-8659
Online Access:Get full text
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Summary: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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ISSN:0167-7055
1467-8659
DOI:10.1111/cgf.13937