Function sample_catmull_rom 

pub fn sample_catmull_rom(
    cps: &[[f32; 3]],
    samples_per_segment: usize,
) -> Vec<[f32; 3]>

Sample a Catmull-Rom curve through cps with samples_per_segment evenly-spaced parameter steps per segment. The first CP appears once at the start; each subsequent segment contributes samples_per_segment points (so the final CP appears once at the end). Returns owned points.