Module rs_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.
• 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.