Module rs_pbrt::core::interpolation

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Expand description

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.

integrate_catmull_rom
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.