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		<citationkey>NunesMiraAndr:2017:UsDiRe</citationkey>
		<title>Using Dimensionality Reduction to Create New Materials from Tabular BRDFs</title>
		<format>On-line</format>
		<year>2017</year>
		<numberoffiles>1</numberoffiles>
		<size>5679 KiB</size>
		<author>Nunes, Mislene da Silva,</author>
		<author>Miranda Junior, Gastão Florêncio,</author>
		<author>Andrade, Beatriz Trinchão,</author>
		<affiliation>Universidade Federal de Sergipe</affiliation>
		<affiliation>Universidade Federal de Sergipe</affiliation>
		<affiliation>Universidade Federal de Sergipe</affiliation>
		<editor>Torchelsen, Rafael Piccin,</editor>
		<editor>Nascimento, Erickson Rangel do,</editor>
		<editor>Panozzo, Daniele,</editor>
		<editor>Liu, Zicheng,</editor>
		<editor>Farias, Mylène,</editor>
		<editor>Viera, Thales,</editor>
		<editor>Sacht, Leonardo,</editor>
		<editor>Ferreira, Nivan,</editor>
		<editor>Comba, João Luiz Dihl,</editor>
		<editor>Hirata, Nina,</editor>
		<editor>Schiavon Porto, Marcelo,</editor>
		<editor>Vital, Creto,</editor>
		<editor>Pagot, Christian Azambuja,</editor>
		<editor>Petronetto, Fabiano,</editor>
		<editor>Clua, Esteban,</editor>
		<editor>Cardeal, Flávio,</editor>
		<e-mailaddress>beatriz@dcomp.ufs.br</e-mailaddress>
		<conferencename>Conference on Graphics, Patterns and Images, 30 (SIBGRAPI)</conferencename>
		<conferencelocation>Niterói, RJ</conferencelocation>
		<date>Oct. 17-20, 2017</date>
		<booktitle>Proceedings</booktitle>
		<publisher>IEEE Computer Society</publisher>
		<publisheraddress>Los Alamitos</publisheraddress>
		<tertiarytype>Full Paper</tertiarytype>
		<transferableflag>1</transferableflag>
		<contenttype>External Contribution</contenttype>
		<keywords>Dimensionality reduction, BRDFs, navigation.</keywords>
		<abstract>Representing reality in computer graphics requires simulating the appearance of real-world materials. Bidirectional Reflectance Distribution Functions (BRDFs) are commonly used to perform this task, as they represent the appearance of a material through the quotient between the reflected radiance and the incoming irradiance at this point. Acquiring the BRDF of a real material is an expensive task due to its high dimensionality, so strategies to take advantage of already existing measurements are a promising solution. In this paper we present an approach to create BRDFs for new materials from a basis of tabular representations of BRDFs. We apply dimensionality reduction in this basis and then we perform a triangulation in the resulting reduced space. Thus, any position in this reduced space can be used to create a new material: using the triangulation, we estimate coefficients that can be used to find the BRDF of this new material by interpolating materials in the original space. In addition, we present a technique to navigate in this reduced space that enables the creation of several different materials from two materials in the basis. This approach provides a wide range of new materials based on real measurements without the need to acquire new BRDFs. We show that our navigation is coherent and that it yields a smooth transition between materials.</abstract>
		<language>en</language>
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		<usergroup>beatriz@dcomp.ufs.br</usergroup>
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