Open-source UV unwrap and repack module backed by xatlas.

Capabilities

• unwrap_mesh() / unwrap_scene() — segment + parameterize + pack a triangle mesh / scene.
• repack_mesh() / repack_scene() — repack existing UV islands.
• Optional progress and cancellation via the notification_func and cancel parameters.

Limitations

• Triangle meshes only; non-triangle inputs throw lagrange::Error.
• Custom ParameterizeFunc is not exposed; xatlas's default LSCM is used.
• Progress / cancellation are not exposed in the Python bindings.