Function iso_curve_at_v
pub fn iso_curve_at_v(
surface: &BSplineSurface,
parameter: f64,
) -> Result<BSplineCurve<DVec3>, GeomError>pub fn iso_curve_at_v(
surface: &BSplineSurface,
parameter: f64,
) -> Result<BSplineCurve<DVec3>, GeomError>