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  4. The Layer Laboratory: A Calculus for Additive and Subtractive Composition of Anisotropic Surface Reflectance
 
research article

The Layer Laboratory: A Calculus for Additive and Subtractive Composition of Anisotropic Surface Reflectance

Zeltner, Tizian  
•
Jakob, Wenzel  
August 1, 2018
Acm Transactions On Graphics

We present a versatile computational framework for modeling the reflective and transmissive properties of arbitrarily layered anisotropic material structures. Given a set of input layers, our model synthesizes an effective BSDF of the entire structure, which accounts for all orders of internal scattering and is efficient to sample and evaluate in modern rendering systems.

Our technique builds on the insight that reflectance data is sparse when expanded into a suitable frequency-space representation, and that this property extends to the class of anisotropic materials. This sparsity enables an efficient matrix calculus that admits the entire space of BSDFs and considerably expands the scope of prior work on layered material modeling. We show how both measured data and the popular class of microfacet models can be expressed in our representation, and how the presence of anisotropy leads to a weak coupling between Fourier orders in frequency space.

In addition to additive composition, our models supports subtractive composition, a fascinating new operation that reconstructs the BSDF of a material that can only be observed indirectly through another layer with known reflectance properties. The operation produces a new BSDF of the desired layer as if measured in isolation. Subtractive composition can be interpreted as a type of deconvolution that removes both internal scattering and blurring due to transmission through the known layer.

We experimentally demonstrate the accuracy and scope of our model and validate both additive and subtractive composition using measurements of real-world layered materials. Both implementation and data will be released to ensure full reproducibility of all of our results.(1)

  • Details
  • Metrics
Type
research article
DOI
10.1145/3197517.3201321
Web of Science ID

WOS:000448185000035

Author(s)
Zeltner, Tizian  
Jakob, Wenzel  
Date Issued

2018-08-01

Publisher

ASSOC COMPUTING MACHINERY

Published in
Acm Transactions On Graphics
Volume

37

Issue

4

Start page

74

Subjects

Computer Science, Software Engineering

•

Computer Science

•

layered materials

•

adding equations

•

subtracting equations

•

brdf

•

bsdf

•

illumination model

•

implementation

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
RGL  
Available on Infoscience
November 14, 2018
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/151405
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