Function pbrt::shapes::nurbs::nurbs_evaluate

pub fn nurbs_evaluate(
    order: i32, 
    knot: &Vec<Float>, 
    cp: &Vec<Homogeneous3>, 
    cp_start: i32, 
    np: i32, 
    cp_stride: i32, 
    t: Float, 
    deriv_opt: Option<&mut Vector3f>
) -> Homogeneous3