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Irradiance Gradients in the Presence of Participating Media and Occlusions
Author(s) -
Jarosz Wojciech,
Zwicker Matthias,
Jensen Henrik Wann
Publication year - 2008
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/j.1467-8659.2008.01246.x
Subject(s) - radiance , irradiance , attenuation , computer science , scattering , interpolation (computer graphics) , translation (biology) , reflectivity , remote sensing , computer vision , computer graphics (images) , artificial intelligence , optics , geology , image (mathematics) , physics , chemistry , biochemistry , messenger rna , gene
Abstract In this paper we present a technique for computing translational gradients of indirect surface reflectance in scenes containing participating media and significant occlusions. These gradients describe how the incident radiance field changes with respect to translation on surfaces. Previous techniques for computing gradients ignore the effects of volume scattering and attenuation and assume that radiance is constant along rays connecting surfaces. We present a novel gradient formulation that correctly captures the influence of participating media. Our formulation accurately accounts for changes of occlusion, including the effect of surfaces occluding scattering media. We show how the proposed gradients can be used within an irradiance caching framework to more accurately handle scenes with participating media, providing significant improvements in interpolation quality.