Multivariate interpolation of large sets of scattered data
ACM Transactions on Mathematical Software (TOMS)
Nonuniform random point sets via warping
Graphics Gems III
Algorithm 661: QSHEP3D: quadratic Shepard method for trivariate interpolation of scattered data
ACM Transactions on Mathematical Software (TOMS)
Properties of tabulated bidirectional reflectance distribution functions
Proceedings of the conference on Graphics interface '97
A low distortion map between disk and square
Journal of Graphics Tools
Reflectance and texture of real-world surfaces
ACM Transactions on Graphics (TOG)
Algorithm 790: CSHEP2D: cubic Shepard method for bivariate interpolation of scattered data
ACM Transactions on Mathematical Software (TOMS)
Scattered Data Techniques for Surfaces
Dagstuhl '97, Scientific Visualization
Representations and uses of light distribution functions
Representations and uses of light distribution functions
A data-driven reflectance model
A data-driven reflectance model
Efficient BRDF importance sampling using a factored representation
ACM SIGGRAPH 2004 Papers
Verification of rendering quality from measured BTFs
APGV '06 Proceedings of the 3rd symposium on Applied perception in graphics and visualization
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We discuss the validation of BTF data measurements by means used for BRDF measurements. First, we show how to apply the Helmholtz reciprocity and isotropy for a single data set. Second, we discuss a cross-validation for BRDF measurement data obtained from two different measurement setups, where the measurements are not calibrated or the level of accuracy is not known. We show the practical problems encountered and the solutions we have used to validate physical setup for four material samples. We describe a novel coordinate system suitable for resampling the BRDF data from one data set to another data set. Further, we show how the perceptually uniform color space CIE 1976 L*a*b* is used for cross-comparison of BRDF data measurements, which were not calibrated.