The tool works by turning your both controllers. Pull either trigger to get a preview curve, and use both hand triggers to start drawing.
Mixed Input mode and Point mode work the same as the ones on Stroke tool.
A. Bridge Curves: Create a surface that connects two curves or edges of other surfaces. Click here to watch a tutorial video.
B. Full Curve: Create surface along the full reference curves. Available only in Bridge Curves mode.
C. Precise: A surface created by precision mode has control point rows for both U and V direction. You can develop it to complex surface by editing. See Advanced Editing for more information.
D. Initial Tension: Determines surface curvature between both controllers.