Added grazing angle extrapolation to BSDF interpolation
Changed progress bar to erase itself when done
Disabled DEBUG statements in BSDF programs and added progress bars
Changed secant correction to patch centers for better normalization
Added tracking of BSDF sample name
Added -l option to limit maximum number of RBF lobes for interpolation
Eliminated matrix transpose, which wasn't working anyway
Added ability to use Dx, Dy and Dz instead of last 3 function parameters
Added code to emit front/back transmission if missing on XML input
Fixed problem with acos(1) returning NaN
Fixed same correlated sampling problem for XML input
Fixed correlated sampling problem for functional BSDFs
New bsdf2klems tool seems to pass basic tests
Untested implementation of Klems conversion from radial basis function
Added bsdf2klems tool -- RBF interpolation currently unimplemented
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