# Extend

[Extend] command extends an existing surface.

## Step 1

For the prompt "Specify Edge" , specify an edge of an existing surface to extend by mouse. Trimmed surfaces or non free-form surfaces are not allowed for this command's target.

## Step 2

For the prompt "Specify length.", input parameters to extend. Pressing OK button will determine the result surface. Preview of the surfaces wll be drawn following to the update of input parameters.

Length to Extend

  Input the arc length of the extending surface edge.

Curvature Variation

  Specify how the extending part should vary by the value between 0. to 1.

Update

  Pressing this button, preview of the generating surface will be drawn.