Edit Curves > Extend
> Extend Curve > 
- Extend Method
-
Distance lets
you enter a value for the length of the Extension Type.
Point extends
to a world space position you specify in Point To Extend To.
- Extension Type
-
Linear extends
the curve in a straight line:
Circular extends
the curve as an arc:
Extrapolate maintains
the tangent of the selected curve.
- Extend Curve At
-
Start extends
the curve from its start point.
End extends
the curve from its end point.
Both extends
the curve at both ends.
- Join to Original
-
Attaches
the curve extension to the original curve. If off, the input curve
and the curve extension are independent objects. You can transform
the extension separately.
- Remove Multiple Knots
-
Removes
the multiple knots that Maya creates when Join To Original is
turned on.
- Keep Original
-
Keeps
the original curve after the extension is created. If both Keep
Original and Join to Original are
off, the extension curve replaces the original curve.
- Input Curve
-
Input
Curve information is read-only. It gives you access to
the input curve you extended. Click the arrow button to select the
curve and open that section of the Attribute Editor.
- Input Point
-
This
is the same as Point To Extend To in the options
window.
