Sketcher BSplineApproximate

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Sketcher BSplineApproximate.svg Sketcher BSplineApproximate

Menu location
Sketch → Sketcher B-spline tools → Convert geometry to B-spline
Default shortcut
Introduced in version
See also
Sketcher Create B-spline


Converts compatible geometry, edges and curves, into a B-spline (see this page for more info about B-splines).

Sketcher BSplineConvertToNurb.png

Various objects before conversion.

Sketcher BSplineConvertToNurb1.png

The same objects after conversion to B-splines.


  1. Select one or several sketch segments and press the the toolbar button Sketcher BSplineApproximate.svg Convert geometry to B-spline.

Make sure to have either the spline degree, polygon, comb, multiplicity or weight visible, otherwise nothing seems to happen. If you converted straight lines, you first need to increase the degree of the lines to make them "bendable".