Paper Info
Title
Multiple scattering from distributions of specular v-grooves.
Abstract
Microfacet-based reflection models are the most common way to represent reflection from rough surfaces. However, a major current limitation of these models is that they only account for single scattering. Unfortunately, single scattering models do not preserve energy. In this paper, we develop a microfacet BRDF for specular v-grooves that includes multiple scattering. Our approach is based on previous work by Zipin, who showed that the number of reflections inside a specular v-groove is bounded and analytically computable. Using his insight, we present a closed form solution for the BRDF and its probability density function (PDF); we also present a method for importance sampling the BRDF. As a result, our BRDF can be easily used within a path-traced rendering system such as PBRT. The model supports any microfacet distribution function, and spatially-varying surface roughness. The images produced by the model have a pleasing appearance compared to traditional single-scattering models.
Year
DOI
Venue
2018
10.1145/3272127.3275078
ACM Trans. Graph.
Keywords
Field
DocType
appearance modeling, microfacet distributions, multiple scattering
Bidirectional reflectance distribution function,Computer vision,Importance sampling,Mathematical analysis,Specular reflection,Artificial intelligence,Scattering,Rendering (computer graphics),Probability density function,Surface roughness,Mathematics,Bounded function
Journal
Volume
Issue
ISSN
37
6
0730-0301
Citations 
PageRank 
References 
1
0.36
10
Authors
2
Name
Order
Citations
PageRank
Feng Xie164.58
Pat Hanrahan2110811148.97