Module convert 

Whole-shape conversion: everything as NURBS, and general affine transforms over a shape.

The geometry-level conversions are exact. What a shape needs is the operator that walks it and restates every dependent description, because conversion necessarily reparameterizes: a circle’s parameter is its angle and a rational quadratic’s is not. So every edge’s range moves to its converted curve’s domain, and every pcurve is re-derived against a surface whose parameterization has also moved. Re-deriving a pcurve is a fit, at the edge’s own parameters, so same-parameter holds by construction.

The affine operator rides on top: an affine map moves a B-spline’s control points and nothing else, so the parameterizations of the converted shape survive the transform untouched, including every fitted pcurve, which is the point of converting first.

Functions

baked_shape

Rebuild a solid, a shell, a face, or a compound of them, with its placements baked into the geometry, keeping every surface and curve in its own analytic vocabulary.

baked_where_placed

The shape with its placements baked in where any is placed, as baked_shape rebuilds it; the shape itself, with an empty history, where no face, surface, edge occurrence or edge curve in it is placed.

general_transformed_shape

Rebuild a solid, a shell, a face, or a compound of them, under a general affine transform.

normals_oppose

Whether new’s normal points against old’s where they meet, read off the middle of old’s chart: what a restatement reports when it replaces a surface by one of the same points.

restate_geometry

Rebuild a shape with its surfaces and curves restated by the caller, every placement baked in and every pcurve re-derived against the new surfaces at the new edges’ parameters.

to_nurbs

Rebuild a solid, a shell, a face, or a compound of them, with every surface and curve in B-spline form.

to_nurbs_within

Rebuild a shape with every surface and curve in B-spline form: exactly where a closed form exists, as to_nurbs does, and fitted within tolerance where none does (an offset surface, a helix, an offset curve), where to_nurbs refuses.

Type Aliases

CurveRestatement

A caller’s restatement of a curve over a range: the new curve and the range on it tracing the same points, or None to keep it.

SurfaceRestatement

A caller’s restatement of a surface: the new surface and whether its normal points against the old one’s, or None to keep it.