Function fit_surface_grid_sections 

pub fn fit_surface_grid_sections(
    rows: &[Vec<Point>],
    degree: usize,
    tolerance: f64,
    tol: Tolerances,
) -> OgeomResult<Fitted<BSplineSurface>>

As fit_surface_grid, with the rows placed across v by chord length: sections lofted through, where the spacing between sections is the skin’s own and may change along it. Centripetal parameters squash a change of spacing (a step twice another’s gets a parameter step only about one and a half times as long), and a cubic through sections so placed sags between them. Each row keeps the centripetal assignment along u.

Errors

As fit_surface_grid.