Function rib 

pub fn rib(
    part: &mut NamedModel,
    namer: &Namer,
    operation_id: &str,
    plane: &CoordinateSystem,
    profile: &Profile,
    target: SolidId,
    (near, far): (Scalar, Scalar),
    growth: Growth,
) -> GeopResult<()>

Grows a rib (near, far) thick — from near to far to the left of the profile in its plane, growing normal to it; from near to far along the plane’s normal, growing parallel to it — from the open profile profile in plane, up to the solid target, and joins it, for the operation operation_id whose names namer builds: the result is named namer’s root. See the module docs.