Start Point/End Point
No constraint: Creates a connecting Curve without any restriction.
Tangent to edge: Creates a Curve which is tangential to the selected edge.
Normal to face: Creates a Curve which is normal to the face belonging to the selected edge.
Normal to edge/face: Creates a Curve normal to the selected edge and parallel to the face which belongs to the selected edge.
Invert: Creates a Curve in the opposite direction.
Note: The face is only non-ambiguous in case of a dangling edge (an edge belonging to only one face).
OK
Press this button to finally create the Curve.
Preview
Press this button to create a preview image of the Curve. This option is very useful to the check the settings before you actually create the Curve.
Cancel
Closes this dialog box without performing any further action.
Help
Shows this help text.
See also