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Scale-related evolution of BRDFs : Technical Report IES-2016-09

Pak, Alexey

Abstract:
In computer graphics, objects are often modeled as polygonal meshes with flat facets, the reflection of light from facets is described by the so-called bi-directional reflectance distribution function (BRDF). Along with the intrinsic optical properties of the material, it captures the effects due to surface microstructure, i.e. shape features smaller than the facet size (and therefore not representable by the mesh model). If the typical facet size changes, some structures may switch from the “responsibility domain” of BRDFs to that of the geometric model, or vice versa. Therefore, for sufficiently complex surfaces, BRDFs are inherently scale-dependent. If one measures a BRDF at one scale, and applies at another, it must be adjusted (“evolved”) according to the specific surface structure. In this report, we derive explicit BRDF evolution equations and discuss their implications.


Zugehörige Institution(en) am KIT Institut für Anthropomatik und Robotik (IAR)
Publikationstyp Proceedingsbeitrag
Jahr 2017
Sprache Englisch
Identifikator ISBN: 978-3-7315-0678-2
ISSN: 1863-6489
URN: urn:nbn:de:swb:90-723548
KITopen ID: 1000072354
Erschienen in Proceedings of the 2016 Joint Workshop of Fraunhofer IOSB and Institute for Anthropomatics, Vision an Fusion Laboratory. Ed.: J. Beyerer
Verlag KIT Scientific Publishing, Karlsruhe
Seiten 123-132
Serie Karlsruher Schriften zur Anthropomatik / Lehrstuhl für Interaktive Echtzeitsysteme, Karlsruher Institut für Technologie ; Fraunhofer-Inst. für Optronik, Systemtechnik und Bildauswertung IOSB Karlsruhe ; 33
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