# Extrude
## 
Extrude
The ExtrudeCrv command creates a surface by tracing the path of a curve in a straight line.
**Steps**
1. Select a curve.
2. Specify a[ ](https://docs.mcneel.com/rhino/8/help/en-us/popup_actions/distance_pick_2pts.htm)distance.
#### Command-line options
Output
* Surface: Create an extrusion or a surface object
* SubD: Create a SubD object.
* A SubD friendly curve as the input creates a better SubD object.
* Some options may not be available when Output=SubD.
Direction: Pick two points to define the extruding direction.
BothSides: Extrude towards the both sides of the input curve.
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.
ToBoundary: Extrude the object to a boundary surface.
DeleteInput: Specify if the input object will be deleted.
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](https://docs.mcneel.com/rhino/8/help/en-us/commands/extrudecrv.htm).
