This is from a recent project where the two input lines (blue and yellow) were lifted from hires scans of 2D views that were drawn “old school”, by hand. Rebuilding the curves was clearly warranted! The white curve is the resulting sheer line  very fair and accurate since it was visually compared to the original scans as slider adjustments were made.
By the way in the help there is a little mistake , VectorB …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.