NDLI: Physically-based simulation of twilight phenomena

Content Provider	ACM Digital Library
Author	Seidel, Hans-Peter Magnor, Marcus Haber, Jörg
Copyright Year	2005
Abstract	We present a physically-based approach to compute the colors of the sky during the twilight period before sunrise and after sunset. The simulation is based on the theory of light scattering by small particles. A realistic atmosphere model is assumed, consisting of air molecules, aerosols, and water. Air density, aerosols, and relative humidity vary with altitude. In addition, the aerosol component varies in composition and particle-size distribution. This allows us to realistically simulate twilight phenomena for a wide range of different climate conditions. Besides considering multiple Rayleigh and Mie scattering, we take into account wavelength-dependent refraction of direct sunlight as well as the shadow of the Earth. Incorporating several optimizations into the radiative transfer simulation, a photo-realistic hemispherical twilight sky is computed in less than two hours on a conventional PC. The resulting radiometric data is useful, for instance, for high-dynamic range environment mapping, outdoor global illumination calculations, mesopic vision research and optical aerosol load probing.
Starting Page	1353
Ending Page	1373
Page Count	21
File Format	PDF
ISSN	07300301
e-ISSN	15577368
DOI	10.1145/1095878.1095884
Volume Number	24
Issue Number	4
Journal	ACM Transactions on Graphics (TOG)
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2005-10-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	3D radiative transfer equation Physics-based sky model Multiple scattering Refraction Twilight phenomena
Content Type	Text
Resource Type	Article
Subject	Computer Graphics and Computer-Aided Design

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