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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| Veröffentlicht in: | Computer graphics forum Jg. 39; H. 2; S. 373 - 384 |
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| Format: | Journal Article |
| Sprache: | Englisch |
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Oxford
Blackwell Publishing Ltd
01.05.2020
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| ISSN: | 0167-7055, 1467-8659 |
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| 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. |
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| AbstractList | 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. |
| Author | Jung, A. Dachsbacher, C. Hanika, J. |
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| Cites_doi | 10.1111/cgf.12026 10.1111/cgf.12419 10.1145/2366145.2366211 10.1111/cgf.12681 10.1111/cgf.13768 10.1145/1597990.1598034 10.1007/978‐0‐387‐46312‐4 10.1364/OE.22.001697 10.1007/978-3-7091-6242-2_18 10.1145/2451236.2451242 10.1145/3084873.3084904 10.1002/cav.10 10.1145/2776880.2792699 10.1111/cgf.13477 10.1145/2366145.2366210 10.1109/RT.2008.4634628 10.1145/15922.15902 10.1111/j.1467‐8659.2008.01152.x 10.1111/cgf.13314 10.1145/1174429.1174484 10.1111/cgf.13136 10.1145/2185520.2185555 10.1111/cgf.13773 10.1364/OE.26.002132 10.1145/1966394.1966404 10.1145/1778765.1778834 |
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| Copyright | 2020 The Author(s) Computer Graphics Forum © 2020 The Eurographics Association and John Wiley & Sons Ltd. Published by John Wiley & Sons Ltd. 2020 The Eurographics Association and John Wiley & Sons Ltd. |
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| SubjectTerms | Algorithms Apexes CCS Concepts Computing methodologies → Ray tracing Fluorescence Reflectance modeling Regularization Spectra Transport phenomena Wavelengths |
| Title | Spectral Mollification for Bidirectional Fluorescence |
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