# ExtendDynamic

The ExtendDynamic command extends a curve by its natural extension to a boundary or point.

#### Steps

- Select a curve near the end to extend
- Click the end point or type an extension length.

The extension will be automatically joined with the original curve.

Command-line options

##### ToBoundary

Select a boundary to extend the curve to.

##### Type

##### Natural

Lines, polylines, and with a line at the end to extend are extended by line.

Arcs and with arc at the end to extend are extended by same radius arc.

Other curves are extended smooth.

##### Arc

Makes an arc extension tangent to the original curve.

#### Arc options

##### Center

Extends a curve with an arc by picking the arc's center and endpoint.

#### Center steps

- Pick the arc's center point.
- Pick the arc's end point.

##### Line

Makes a line extension tangent to the original curve.

##### Smooth

Makes a smooth curve extension with the original curve.

##### ToPoint

Extends a curve smoothly by picking the curve's endpoint.

##### Join (Yes/No/Merge)

Decides if the extended segment will be joined or merged with the input curve.

##### Undo

Reverses the last action.

## See also

Extend curves and surfaces

Wikipedia: Tangent

Rhinoceros 8 © 2010-2024 Robert McNeel & Associates. 16-May-2024