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The ExtrudeCrvAlongCrv command creates a surface by tracing the path of a curve along another path curve.
Select a curve.
Select the path curve.
Output
Surface: Create a surface object.
SubD: Create a SubD object.
Solid: If the profile curve is closed and planar, both ends of the extrude objects are filled with planar surfaces and joined to make a closed polysurface.
DeleteInput: Deletes (Yes) or keeps (No) the input objects.
SubCurve: Extrudes a curve the distance specified by picking two points along a curve. The extruded surface starts from the beginning of the curve, not the first picked point. Picking the points only establishes the extrusion distance.
Steps
Select the path curve.
Pick a start along the path curve.
Pick an end along the path curve.
SplitAtTangents
Yes: Tangent points on the input curve extrude as joined edges.
No: Tangent points on the input curve extrude as surface kinks.
For more information, please refer to the Rhino documentation.
