Abstract
The bidirectional reflectance distribution function (BRDF) is critical for rendering, and accurate material representation requires data-driven reflectance models. However, isotropic BRDFs are 3D functions, and measuring the reflectance of a flat sample can require a million incident and outgoing direction pairs, making the use of measured BRDFs impractical. In this paper, we address the problem of reconstructing a measured BRDF from a limited number of samples. We present a novel mapping of the BRDF space, allowing for extraction of descriptive principal components from measured databases, such as the MERL BRDF database. We optimize for the best sampling directions, and explicitly provide the optimal set of incident and outgoing directions in the Rusinkiewicz parameterization for n = {1, 2, 5, 10, 20} samples. Based on the principal components, we describe a method for accurately reconstructing BRDF data from these limited sets of samples. We validate our results on the MERL BRDF database, including favorable comparisons to previous sets of industry-standard sampling directions, as well as with BRDF measurements of new flat material samples acquired with a gantry system. As an extension, we also demonstrate how this method can be used to find optimal sampling directions when imaging a sphere of a homogeneous material; in this case, only two images are often adequate for high accuracy.
Original language | English |
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Article number | 186 |
Journal | A C M Transactions on Graphics |
Volume | 34 |
Issue number | 6 |
Number of pages | 11 |
ISSN | 0730-0301 |
DOIs | |
Publication status | Published - 2015 |
Event | 8th ACM SIGGRAPH Conference and Exhibition on Computer Graphics and Interactive Techniques in Asia (2015) - Kobe Convention Center, Kobe, Japan Duration: 2 Nov 2015 → 5 Nov 2015 Conference number: 8 http://sa2015.siggraph.org/en/ |
Conference
Conference | 8th ACM SIGGRAPH Conference and Exhibition on Computer Graphics and Interactive Techniques in Asia (2015) |
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Number | 8 |
Location | Kobe Convention Center |
Country/Territory | Japan |
City | Kobe |
Period | 02/11/2015 → 05/11/2015 |
Internet address |
Bibliographical note
Published in: ACM Transactions on Graphics (TOG) - Proceedings of ACM SIGGRAPH Asia 2015Keywords
- Reflectance
- BRDF
- MERL
- Reconstruction