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Analytic Spectral Integration of Birefringence‐Induced Iridescence
Author(s) -
Steinberg S.
Publication year - 2019
Publication title -
computer graphics forum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 120
eISSN - 1467-8659
pISSN - 0167-7055
DOI - 10.1111/cgf.13774
Subject(s) - birefringence , rendering (computer graphics) , anisotropy , optics , refraction , computer science , observable , graphics , physics , computer graphics (images) , quantum mechanics
Optical phenomena that are only observable in optically anisotropic materials are generally ignored in the computer graphics. However, such optical effects are not restricted to exotic materials and can also be observed with common translucent objects when optical anisotropy is induced, e.g. via mechanical stress. Furthermore accurate prediction and reproduction of those optical effects has important practical applications. We provide a short but complete analysis of the relevant electromagnetic theory of light propagation in optically anisotropic media and derive the full set of formulations required to render birefringent materials. We then present a novel method for spectral integration of refraction and reflection in an anisotropic slab. Our approach allows fast and robust rendering of birefringence‐induced iridescence in a physically faithful manner and is applicable to both real‐time and offline rendering.