Surface Edit > Create CurvesOnSurface

Creates curves-on-surface from existing curves and surfaces by projecting the curves onto the surfaces.

Project Options

Create: Curves-on-surface – The projection results in curves-on-surface.

Curves – The projection results in free curves.
Curve fit: This option is only available if Create is set to Curves.

If this option is checked, a fitting algorithm is used to fit a free curve to the projected curve-on-surface. You have explicit control on the degree and number of spans through the Degree and Spans sliders.
Match original: This option is only available if Create is set to Curves.

If this option is checked, the edit points from the original curves are projected on the surface(s), and the projected curves interpolate them, resulting in a similar number of spans.

Explicit Control Settings

These options are only available after the Curve fit option has been used to create a free curve.

Degree: Lets you control the degree of the projected curve in Curve fit mode.
Spans: Lets you control the number of spans of the projected curve in Curve fit mode.

Vector Options

X, Y, Z: Specifies a projection vector along that axis.
View: Specifies a vector normal to the current view. The vector is not drawn in the view windows.

If the current view is changed, click Refresh View Vector to update the vector.
Picked: Lets you specify the name of an existing vector in the Picked Vector field, or pick the vector in the view.
Normal: The projection is done along the surface normals instead of using a single vector direction.
Refresh View Vector: This button only appears if View is selected. Click it to update the vector if the view has been modified
Retain Vector: Click this button to create a vector construction object in the view windows.Otherwise, the tool uses the vector direction you specified, but you are not able to see and re-use the vector.

Control Options

Create History: Save the history of the projection for later editing. If you turn Create History on, you can modify the curves and surfaces that were used to create the projected curves, and the projected curves will update. See Troubleshooting trimmed surfaces.