Hi Cemortan, some commands like Loft keep track of whether the curves used for building the surface needed to be flipped or have their "seam" start/end point (for closed curves) to be modified from the curve's own natural direction and seam point in order to avoid making a twisted surface. This information is stored in a factory input so that if the curves are edited and a history recalculation is done it will use the same orientations and seam points from the original loft (which may be customized by the user by clicking on a closed curve or dragging a point) rather than trying to make new ones.

Usually this is done automatically by the loft factory but the function you are asking about will build the orientation list manually, the list will have one CurveOrientation object per curve passed in, the curve orientation object (IMoiCurveOrientation in the moi.idl file) has "flipped" and "seam" properties on it.

- Michael