Rendering of SVBRDFs reconstructed by our method. (a) Satin with complex needlework. (b) Velvet with complex reflectance. (c) Brushed metal exhibiting rich tangent variations. (d) Anisotropic paper with bumpy geometric details.
We present a generalized linear light source solution to estimate both the local shading frame and anisotropic surface reflectance of a planar spatially varying material sample. We generalize linear light source reflectometry by modulating the intensity along the linear light source, and show that a constant and two sinusoidal lighting patterns are sufficient for estimating the local shading frame and anisotropic surface reflectance. We propose a novel reconstruction algorithm based on the key observation that after factoring out the tangent rotation, the anisotropic surface reflectance lies in a low rank subspace. We exploit the differences in tangent rotation between surface points to infer the low rank subspace and fit each surface point's reflectance function in the projected low rank subspace to the observations. We propose two prototype acquisition devices for capturing surface reflectance that differ on whether the camera is fixed with respect to the linear light source or fixed with respect to the material sample. We demonstrate convincing results obtained from reflectance scans of surfaces with different reflectance and shading frame variations.
BRDF, anisotropic, linear light source
We wish to thank the reviewers for their constuctive feedback. Pieter Peers was partially funded by NSF grants: IIS-1217765, IIS-1350323, and a gift from Google.