SIGGRAPH '86 Proceedings of the 13th annual conference on Computer graphics and interactive techniques
Modeling the effect of the atmosphere on light
ACM Transactions on Graphics (TOG)
The zonal method for calculating light intensities in the presence of a participating medium
SIGGRAPH '87 Proceedings of the 14th annual conference on Computer graphics and interactive techniques
Illumination and color in computer generated imagery
Illumination and color in computer generated imagery
Physically based lighting calculations for computer graphics
Physically based lighting calculations for computer graphics
Ray tracing in non-constant media
Proceedings of the eurographics workshop on Rendering techniques '96
A practical analytic model for daylight
Proceedings of the 26th annual conference on Computer graphics and interactive techniques
A progressive refinement approach to fast radiosity image generation
SIGGRAPH '88 Proceedings of the 15th annual conference on Computer graphics and interactive techniques
A physically-based night sky model
Proceedings of the 28th annual conference on Computer graphics and interactive techniques
Astronomical Algorithms
Astronomical Formulae for Calculators
Astronomical Formulae for Calculators
A survey of the modelling and rendering of the earth's atmosphere
SCCG '02 Proceedings of the 18th spring conference on Computer graphics
IEEE Transactions on Visualization and Computer Graphics
SIGGRAPH '84 Proceedings of the 11th annual conference on Computer graphics and interactive techniques
Proceedings of Graphics Interface 2009
ACM SIGGRAPH ASIA 2009 Courses
Real-time spectral scattering in large-scale natural participating media
Proceedings of the 26th Spring Conference on Computer Graphics
An analytic model for full spectral sky-dome radiance
ACM Transactions on Graphics (TOG) - SIGGRAPH 2012 Conference Proceedings
Precomputed atmospheric scattering
EGSR'08 Proceedings of the Nineteenth Eurographics conference on Rendering
Hi-index | 0.00 |
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.