Extend

Extend or shorten a curve by a user-defined length, to a given point, or to another curve.

1. On the ribbon, click the Curves tab.
2. Click the Extend icon.
   
   
3. Extend a curve:
   • Click a curve near the end point. By default, the curve is extended at the end point at a length of 1.0.
   • In the guide bar, select one of the following options:
     • Start: Extend the curve at the start point.
     • End: Extend the curve at the end point.
     • Both: Extend the curve at both the start point and end point.

   Tip: To display information about the extension, click the end point of the extension.
4. Optional: See Step 2 of Edit an Extension.
5. Double-right click to exit the tool.

Change the location, shape, distance, increment factor, total length, parameter distance, and reference curve.

1. Double-click the extension to enter edit mode.
2. Edit the extension.

   To	Do this
   Change the location of the extension	In the guide bar, select one of the following options: Start: Extend the curve at the start point. End: Extend the curve at the end point. Both: Extend the curve at both the start point and end point.
   Change the shape	In the guide bar, select one of the following options: Linear Shape (default): The extension is a segment. Soft Shape: The extension has continuous curvature. Reflective Shape: The extension is the mirror image of the curve. Natural Shape: The original curve is extended. Arc Shape: The extension is shaped like an arc.
   Change the length of the extension	Drag the end point of the extension. In the guide bar, select Extension Distance, and then enter a Length. Click the end point. In the microdialog, select Extension Distance, and then enter a Length.
   Change the increment factor	The increment factor increases the length by a percentage. For example, if you enter a value of 0.1, the length increases by 10%. In the guide bar, select Increment Factor, and then enter a Parameter. Click the end point. In the microdialog, select Increment Factor, and then enter a Parameter.
   Change the total length of the curve	In the guide bar, select Total Length, and then enter a Length. Click the end point. In the microdialog, select Total Length, and then enter a Length.
   Change the parameter distance	In the guide bar, select Up to Parameter, and then enter a Parameter distance. Click the end point. In the microdialog, select Up to Parameter, and then enter a Parameter distance.
   Change the reference curve	You can extend the curve to another curve. In the guide bar, select Reference curve/surface, and then click a curve. Click the end point. In the microdialog, select Reference curve/surface, and then click a curve. This option is indicated by green handles at the end point of the extension.

3. Right-click and mouse through the check mark to exit, or double-right-click.