# Extrude Curve Along Curve
## 
Extrude Curve Along Curve
The ExtrudeCrvAlongCrv command creates a surface by tracing the path of a curve along another path curve.
**Steps**
1. Select a curve.
2. Select the path curve.
#### Command-line options
Output
* Surface: Create a surface object.
* SubD: Create a SubD object.
* SubD friendly curves as the input create a better SubD object.
* Some options may not be available when Output=SubD.
Solid: If the profile curve is closed and planar, both ends of the extruded object are filled with planar surfaces and joined to maje a closed polysurface.
DeleteInput
* Yes: Deletes the input objects.
* No: Keeps 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
1.Select the path curve.
2.Pick a start along the path curve.
3.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](https://docs.mcneel.com/rhino/8/help/en-us/commands/extrudecrvalongcrv.htm).
