Precomputed Atmospheric Scattering

Eric Bruneton 1 Fabrice Neyret 1, 2
1 EVASION - Virtual environments for animation and image synthesis of natural objects
Inria Grenoble - Rhône-Alpes, LJK - Laboratoire Jean Kuntzmann, INPG - Institut National Polytechnique de Grenoble
2 ARTIS - Acquisition, representation and transformations for image synthesis
Inria Grenoble - Rhône-Alpes, LJK - Laboratoire Jean Kuntzmann, INPG - Institut National Polytechnique de Grenoble
Abstract : We present a new and accurate method to render the atmosphere in real time from any viewpoint from ground level to outer space, while taking Rayleigh and Mie multiple scattering into account. Our method reproduces many effects of the scattering of light, such as the daylight and twilight sky color and aerial perspective for all view and light directions, or the Earth and mountain shadows (light shafts) inside the atmosphere. Our method is based on a formulation of the light transport equation that is precomputable for all view points, view directions and sun directions. We show how to store this data compactly and propose a GPU compliant algorithm to precompute it in a few seconds. This precomputed data allows us to evaluate at runtime the light transport equation in constant time, without any sampling, while taking into account the ground for shadows and light shafts. More informations : http://evasion.imag.fr/Membres/Eric.Bruneton/#atmo
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Eric Bruneton, Fabrice Neyret. Precomputed Atmospheric Scattering. Computer Graphics Forum, Wiley, 2008, Special Issue: Proceedings of the 19th Eurographics Symposium on Rendering 2008, 27 (4), pp.1079-1086. ⟨10.1111/j.1467-8659.2008.01245.x⟩. ⟨inria-00288758⟩

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