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Optimizing BRDF orientations for the manipulation of anisotropic highlights
Author(s) -
Raymond Boris,
Guennebaud Gaël,
Barla Pascal,
Pacanowski Romain,
Granier Xavier
Publication year - 2014
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/cgf.12300
Subject(s) - computer science , anisotropy , solver , tangent , bidirectional reflectance distribution function , impression , object (grammar) , software , computer graphics (images) , field (mathematics) , artificial intelligence , computer vision , geometry , mathematics , optics , reflectivity , physics , programming language , world wide web , pure mathematics
This paper introduces a system for the direct editing of highlights produced by anisotropic BRDFs, which we call anisotropic highlights. We first provide a comprehensive analysis of the link between the direction of anisotropy and the shape of highlight curves for arbitrary object surfaces. The gained insights provide the required ingredients to infer BRDF orientations from a prescribed highlight tangent field. This amounts to a non‐linear optimization problem, which is solved at interactive framerates during manipulation. Taking inspiration from sculpting software, we provide tools that give the impression of manipulating highlight curves while actually modifying their tangents. Our solver produces desired highlight shapes for a host of lighting environments and anisotropic BRDFs.