Function to_bezier 

pub fn to_bezier(
    model: &mut Model,
    shape: &Shape,
    tol: Tolerances,
) -> OgeomResult<Built>

shape with every curve and surface a single Bézier span: converted to splines, cut at every knot, and each piece’s geometry restated as the span it covers, parameters kept.

What shape shares with other shapes is copied before it is worked on (ogeom_algo::on_own_nodes), which leaves them as they are.

Errors

As ogeom_algo::to_nurbs and divide_by_continuity.