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B-Spline

In one sentence: Draws a smooth B-spline curve through a set of clicked control points, with optional closure into a face.

Overview

Workbench: Draft
Menu: Draft → Drafting → B-Spline
Command: Draft_BSpline

Each click adds a control point; the curve passes through all points (interpolating spline). For full NURBS control (weights, custom knots), use Part workbench NURBS tools.

Key properties

Property Description
Points Control point list
Closed Close the spline back to the first point
Make Face Fill a closed spline with a face
Parameterization Controls how knots are spaced

Common mistakes and pitfalls

Degree increases with point count

Draft B-Spline uses a uniform interpolating spline whose effective degree grows with the number of control points. For controlled smooth curves, use fewer points or the Cubic Bézier tool.

See also