Cutting a shape in a solid using a curve, with a non-segmented result — is it possible? Hello everyone. My question concerns curves which, like the one in the image, are a combination of arcs and straight lines. I know this works in the case of control points curves and interpolate curves, but with…

What is it you are trying to achieve with this method? It is possible to have a single surface with internal G1 tangent joints, but is not recommended, it can cause problems with meshing and downstream processes. What is your goal here?

[image] Helvetosaur: What is it you are trying to achieve with this method? It is possible to have a single surface with internal G1 tangent joints, but is not recommended, it can cause problems with meshing and downstream processes. What is your goal here? Thanks for reply. Edge chamfering, …

Chamfering generally involves G0 non-tangent joints. These cannot be made as single surfaces without a lot of trouble and the internal kinks are likely to cause failures in a lot of operations.

[image] Robert Sojka: is it possible to transform straight lines and arcs into a logically single curve, without segments? no. surface yes, but that is a bit tricky as @Helvetosaur pointed out. you can merge the surfaces with option smooth unchecked but that can cause issues. also if you ext…

Arc. Line. Arc. Three surfaces. What’s the problem with that?

[Screenshot 2026-01-02 at 23.21.35] [Screenshot 2026-01-02 at 23.20.58] [Screenshot 2026-01-02 at 23.21.45] here just to show that you would not notice if you use a control point curve. left side is the split arc surfaces right side was a curve that i derived from the arc but rebuild it as contr…

[image] Robert Sojka: s it possible to transform straight lines and arcs into a logically single curve, without segments? curve: yes. _toNurbs will do it. if the resulting nurbs curve with kinks / multiple Knots makes sense, - same for a surface - is another question. reverse: _explode …

[image] Tom_P: what do you need it for ? Was never explained. Likely yet another classic xy-problem.

[image] Tom_P: _toNurbs will do it. no. when you use the command on the arc and 2 lines you get again 3 joined lines that can be exploded into 3. the resulting curve also does not create a single cut in a cube.

[image] encephalon: [image] Tom_P: _toNurbs will do it. no. yes :roll_eyes: PolyLine + Fillet = Polycurve (line - arc - line) [Screenshot 2026-01-03 at 11.30.50] _toNurbs = single Nurbs Curve [Screenshot 2026-01-03 at 11.31.19] [image] RhinoCommon equivalent of "Explode" The…

A curve cutting a shape in a solid

Rhino

Tom_P January 3, 2026, 10:37am 11

yes

PolyLine + Fillet = Polycurve (line - arc - line)

_toNurbs = single Nurbs Curve

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A curve cutting a shape in a solid

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