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Solid Extrude Planar Curve > Along Curve Surface Extrude Curve > Along Curve 
The ExtrudeCrvAlongCrv command creates a surface by tracing the path of a curve along another path curve.
The extrusion preview direction in the viewport defines the positive direction for distance input.
Commandline options  

Solid 
If the profile curve is closed and planar, both ends of the extruded object are filled with planar surfaces and joined to make a closed polysurface. 
DeleteInput 
YesDeletes the original geometry. NoRetains the original geometry. 
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. 
SplitAtTangents 
YesCreates a single surface. NoCreates a polysurface when the input curves are joined tangent curves. Faces in the resulting polysurface correspond to the tangent subcurves in the input curves. 
Rhinoceros 6 © 20102019 Robert McNeel & Associates. 12Apr2019