Modeling anisotropic surface reflectance with example-based microfacet synthesis

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Modeling anisotropic surface reflectance with example-based microfacet synthesis

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ACM Transactions on Graphics (TOG) archive
Volume 27 , Issue 3 (August 2008) table of contents
Proceedings of ACM SIGGRAPH 2008

SESSION: Faces & reflectance table of contents

Article No. 41

Year of Publication: 2008

ISSN:0730-0301

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Authors

Jiaping Wang	Microsoft Research Asia
Shuang Zhao	Shanghai Jiaotong University
Xin Tong	Microsoft Research Asia
John Snyder	Microsoft Research
Baining Guo	Microsoft Research Asia

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ACM New York, NY, USA

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ABSTRACT

We present a new technique for the visual modeling of spatiallyvarying anisotropic reflectance using data captured from a single view. Reflectance is represented using a microfacet-based BRDF which tabulates the facets' normal distribution (NDF) as a function of surface location. Data from a single view provides a 2D slice of the 4D BRDF at each surface point from which we fit a partial NDF. The fitted NDF is partial because the single view direction coupled with the set of light directions covers only a portion of the "half-angle" hemisphere. We complete the NDF at each point by applying a novel variant of texture synthesis using similar, overlapping partial NDFs from other points. Our similarity measure allows azimuthal rotation of partial NDFs, under the assumption that reflectance is spatially redundant but the local frame may be arbitrarily oriented. Our system includes a simple acquisition device that collects images over a 2D set of light directions by scanning a linear array of LEDs over a flat sample. Results demonstrate that our approach preserves spatial and directional BRDF details and generates a visually compelling match to measured materials.

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