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A PCA Decomposition for Real‐time BRDF Editing and Relighting with Global Illumination
Author(s) -
Nguyen Chuong H.,
Kyung MinHo,
Lee JooHaeng,
Nam SeungWoo
Publication year - 2010
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.1467-8659.2010.01744.x
Subject(s) - bidirectional reflectance distribution function , radiance , computer science , rendering (computer graphics) , precomputation , computer graphics (images) , artificial intelligence , real time rendering , computer vision , reflectivity , computation , remote sensing , algorithm , geology , physics , optics
We propose a novel rendering method which supports interactive BRDF editing as well as relighting on a 3D scene. For interactive BRDF editing, we linearize an analytic BRDF model with basis BRDFs obtained from a principal component analysis. For each basis BRDF, the radiance transfer is precomputed and stored in vector form. In rendering time, illumination of a point is computed by multiplying the radiance transfer vectors of the basis BRDFs by the incoming radiance from gather samples and then linearly combining the results weighted by user‐controlled parameters. To improve the level of accuracy, a set of sub‐area samples associated with a gather sample refines the glossy reflection of the geometric details without increasing the precomputation time. We demonstrate this program with a number of examples to verify the real‐time performance of relighting and BRDF editing on 3D scenes with complex lighting and geometry.