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Advanced Radiance Estimation For Photon Map Global Illumination
Author(s) -
Hey Heinrich,
Purgathofer Werner
Publication year - 2002
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 - 10.1111/1467-8659.00704
Subject(s) - radiance , global illumination , computer science , point (geometry) , photon , plane (geometry) , visualization , computer vision , artificial intelligence , computer graphics (images) , optics , geometry , physics , mathematics , rendering (computer graphics)
Abstract We present a new method to compute radiance in photon map based global illumination simulation for polygonal scenes with general bidirectional scattering distribution functions (BSDFs). Our new radiance estimation uses the actual geometry in the neighborhood of the illuminated point, and does not assume that the nearest neighbor photons lie in the same plane as the point, nor that they are distributed in a circular area around that point. This allows us to achieve accurate indirect illumination by direct visualization of the photon map — which is especially important for the simulation of caustics(LS+DS*Epaths) — even in the vicinity of edges and corners of objects, and on surfaces with differently oriented small geometric details.