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Nice !

Done.
Thanks for your contribution.

However, I don't understand why a ruled surface has to follow that. A BSpline curve has 2 components : - an algebraic part, defined by the degree and the knot sequence, that define the "attracting power" of each control point. - a geometric part : the control points. To build a ruled surf...

Is there a way to do something similar without altering the original curves? I am afraid it is not possible. You cannot change the internal parametrization of a curve, without changing its shape Therefore, here are some possible solutions : - approximate the existing curves, as proposed by edwillia...

Thanks for the file.
I have pushed a fix.

Would you have a test file please ?

This should be the solution :
https://forum.freecadweb.org/viewtopic. ... 74#p472474

TheMarkster wrote: ↑Wed Aug 10, 2022 3:44 pm I tried making an isocurve in Curves workbench, but failed.

This should be fixed on a fresh build

Hi,
It is almost complete, but I just realized we are still missing a change.
And the PR fails compiling on my Manjaro PC.
So we need some more work on this tomorrow.

Take a cylinder face. It is built from a rectangle wire (4 edges and 4 vertexes), wrapped around a cylinder surface. The 2 opposite edges get fused into a single edge (the seam edge). And the 4 vertexes get fused into 2 vertexes. OrderedEdges and OrderedVertexes include the edges and vertexes that w...