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Spectral Mollification for Bidirectional Fluorescence

Authors :
Carsten Dachsbacher
Johannes Hanika
Alisa Jung
Source :
Computer Graphics Forum. 39:373-384
Publication Year :
2020
Publisher :
Wiley, 2020.

Abstract

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.

Details

ISSN :
14678659 and 01677055
Volume :
39
Database :
OpenAIRE
Journal :
Computer Graphics Forum
Accession number :
edsair.doi...........6bd304ab4061b44ba061c5657711ea68
Full Text :
https://doi.org/10.1111/cgf.13937