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Solid Extrude Planar Curve > Tapered Surface Extrude Curve > Tapered 
The ExtrudeCrvTapered command creates a surface by tracing the path of a curve in a straight line tapering in or out at a specified draft angle.
Commandline options  

SetBasePoint 
Specify a location that serves as the first point when picking two points that set the extrusion distance. 
Direction 
Two points establish the direction angle. Direction steps

DraftAngle 
Specify the draft angle for the taper. The draft angle depends on the construction plane orientation. When the surface is vertical/perpendicular to the construction plane, the draft angle is zero. When the surface is parallel to the construction plane, the draft angle is 90 degrees. 
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. 
Corners 
Specifies how corner continuity is handled. SharpThe corners of the tapered surfaces will extend to meet at sharp corners with position (G0) continuity. RoundThe corners of the tapered surfaces will be filled with filleted segments with tangent (G1) continuity. SmoothThe corners of the tapered surfaces will be filled with blend segments with curvature (G2) continuity. 
DeleteInput 
YesDeletes the original geometry. NoRetains the original geometry. 
FlipAngle 
Toggles the draft angle direction. 
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. 
Rhino for Mac © 20102017 Robert McNeel & Associates. 24Oct2017