One guide curve and one section curve, "on faces" mode:

In the "ON FACES" method, the sweeping coordinate system is defined as follow:

V is not a constant vector but is given by the normal to the support faces.

In this mode the vertical direction is not asked since it is calculated on each point of the guide curve.

On the other hand, it is asked to select the support faces. They must be tangentially continuous and belong to the same element.

It is better to make a projection of the guide curve on the support faces in order to avoid some problems due to its construction and its tangency with the faces.