Function pbrt::core::interpolation::sample_catmull_rom_2d

pub fn sample_catmull_rom_2d(
    nodes1: &Vec<Float>, 
    nodes2: &Vec<Float>, 
    values: &Vec<Float>, 
    cdf: &Vec<Float>, 
    alpha: Float, 
    u: Float, 
    fval: Option<&mut Float>, 
    pdf: Option<&mut Float>
) -> Float

Importance sampling of 2D functions via spline interpolants.