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.