Extending NURBS Curves and Surfaces

NURBS curves and surfaces can be extended by a specified distance with the Extend NURBS command.

Closed NURBS curves and trimmed NURBS surfaces cannot be extended. In addition, a NURBS surface cannot be extended in the direction (U or V) that it is closed.

To extend a NURBS curve or surface:

1.	Select the NURBS curve or surface to extend.

2.	Select Model > 3D Power Pack > Extend NURBS.

The Extend NURBS dialog box opens. Select the end point (for NURBS curves) or edge (for NURBS surfaces) to extend. On the drawing, the selected edge or end point is displayed in red. Select the type of extension to make and specify the extension distance.

 

Parameter	Description
Select End Point/Edge	Click the arrows to select the end point or edge to extend. The selected end point or edge is displayed in red on the drawing.
Linear Extension	Extends the edge or end point tangentially
Smooth Extension	Extends the edge or end point by continuing the current curvature
Distance	Specifies the extension distance
Preview	Click to see a preview of the extension in red

3.	Click Preview to check the extension, and then click OK to extend the NURBS curve or surface.