Use Python or c# : Rhino.Geometry.Curve.CreateCurve2View
Crv2View.gh (6.1 KB)
By the way in the help there is a little mistake , VectorB â€¦the seconf curve
Help on builtin function CreateCurve2View
 CreateCurve2View(...)
 CreateCurve2View(curveA: Curve, curveB: Curve, vectorA: Vector3d, vectorB: Vector3d, tolerance: float, angleTolerance: float) > Array[Curve]

 Creates a third curve from two curves that are planar in different construction
 planes.
 The new curve looks the same as each of the original
 curves when viewed in each plane.


 curveA: The first curve.
 curveB: The second curve.
 vectorA: A vector defining the normal direction of the plane which the first curve is
 drawn upon.

 vectorB: A vector defining the normal direction of the plane which the seconf curve is
 drawn upon.

 tolerance: The tolerance for the operation.
 angleTolerance: The angle tolerance for the operation.
 Returns: An array containing one or more curves if successful.