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.

Errors

As ogeom_algo::to_nurbs and divide_by_continuity.