This dialog converts a curve to a point curve on surface or CV curve on surface.
The Make COS button that displays it is enabled only for the following types of curves:
If the curve is already a curve on surface, this dialog lets you change its type.
Number of CVs Specifies the number of CVs in the new curve.
Number of Points Specifies the number of points in the new curve.
When on, previews the effect of the conversion in viewports. Default=on.