Template-Based Sampling of Anisotropic BRDFs

0432894 - ÚTIA 2015 RIV GB eng J - Journal Article
Filip, Jiří - Vávra, Radomír
Template-Based Sampling of Anisotropic BRDFs.
Computer Graphics Forum. Roč. 33, č. 7 (2014), s. 91-99. ISSN 0167-7055. E-ISSN 1467-8659.
[Pacific Graphics 2014. Soul, 08.10.2014-10.10.2014]
R&D Projects: GA ČR(CZ) GA14-02652S; GA ČR(CZ) GA14-10911S; GA ČR GAP103/11/0335
Institutional support: RVO:67985556
Keywords : BRDF database * material appearnce * sampling * measurement
Subject RIV: BD - Theory of Information
Impact factor: 1.642, year: 2014
http://library.utia.cas.cz/separaty/2014/RO/filip-0432894.pdf

BRDFs are commonly used to represent given materials' appearance in computer graphics and related fields. Although, in the recent past, BRDFs have been extensively measured, compressed, and fitted by a variety of analytical models, most research has been primarily focused on simplified isotropic BRDFs. In this paper, we present a unique database of 150 BRDFs representing a wide range of materials; the majority exhibiting anisotropic behavior. Since time-consuming BRDF measurement represents a major obstacle in the digital material appearance reproduction pipeline, we tested several approaches estimating a very limited set of samples capable of high quality appearance reconstruction. Initially, we aligned all measured BRDFs according to the location of the anisotropic highlights. Then we propose an adaptive sampling method based on analysis of the measured BRDFs. For each BRDF, a unique sampling pattern was computed, given a predefined count of samples. Further, template-based methods are introduced based on reusing of the precomputed sampling patterns.
Permanent Link: http://hdl.handle.net/11104/0238335