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hermite_interpolate

steel_worldgen::density::spline_eval

Function hermite_interpolate 

Source 
pub fn hermite_interpolate(
    x1: f32,
    x2: f32,
    y1: f32,
    y2: f32,
    d1: f32,
    d2: f32,
    input: f32,
) -> f32
Expand description

Hermite cubic interpolation between two adjacent spline points.

Given two points (x1, y1) and (x2, y2) with derivatives d1 and d2, evaluates the hermite cubic at input.

Matches vanilla’s formula: lerp(t, y1, y2) + t * (1 - t) * lerp(t, a, b).