Module pbrt::core::interpolation

Spline-based interpolation to reconstruct BSDF values (instead of using large lookup tables).

Functions

catmull_rom_weights	Calculates an offset and four weights for Catmull-Rom spline interpolation.
fourier	Evaluates the weighted sum of cosines.
sample_catmull_rom_2d	Importance sampling of 2D functions via spline interpolants.
sample_fourier	Returns the value of the Fourier expansion at the sampled position.