The Ribbon command Offsets a curve and creates a ruled surface between the two curves.
Steps
Select a curve.
Drag the cursor to one side of the curve and pick.
Command-line options
Distance: Sets the offset distance.
Loose: The Corner and Tolerance options are not shown and do not affect the output. Polycurves are offset as a group of separate curve segments, and there is no corner trimming or filling.
Corner: Specifies how corners are handled when they are offset to the "convex" side as pointed out in the image.
Sharp: Curves offset to the outside of a corner will be extended to meet at sharp corners with position (G0) continuity.
Round: Curves offset to the outside of a corner will be filled with arc segments with tangent (G1) continuity.
Smooth: Curves offset to the outside of a corner will be filled with blend segments with curvature (G2) continuity.
Chamfer: The corners of the offset curves will be filled with a straight line between their endpoints.
ThroughPoint: Offset through a picked point instead of at a distance.
Tolerance: Sets the tolerance for the offset curve. Type 0 to use the default system tolerance.
BothSides: Offsets the curve on both sides of the input curve.
InCPlane: The curve is offset in the plane of the original curve. This option offsets the curve in the plane of the current construction plane instead.
OutputLayer
Current: Place the results on the current layer.
Input: Place the results on the same layer as the input objects.
For more information, please refer to the Rhino documentation.
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