Extension

This command allows you to extend the borders of a surface.

Creation Stages / Use:

Click on the icon or choose the command Surface> Extension... from the drop down menu.

Select a face's border edges or select a face if you want to extend all of the faces dimensions.
Choose the calculation mode for the length of the extension:

Length mode: The value of the extension is entered manually.

Shape Mode: The surface is extended to the first intersection between the faces and a shape.

In this mode, the selected shape must absolutely exceed the face to extend.

Face mode: The surface is extended to the intersection with a face.

Validate with the button.

It is not possible to select border edges that belong to different shapes.

Available Options:

Linear mode allows for a tangent extension, while Curvature mode also respects the curvature of the face.

Modify faces:

This command can either create new faces (option activated) or modify the reference faces (option deactivated).For example, if the face is extended by 5mm and the option is activated, the initial face will not change but a second face will be created with a 5 mm length. If the option is activated the face is extended by 5 mm.

Boundary type:

Exact : Boundary extensions represent an exact measure of the distance from origin boundaries.
Approximate : Boundary extensions represent an approximate measure of the distance from origin boundaries. Only the lateral boundaries length is exact.


Exact	Approximate

Side edge:

Automatic: TopSolid selects for each edge the best method.
Following adjacent edge: The extension side edge is created following the adjacent edge and/or its extension.
Orthogonal to base edge: The side edge is created orthogonal to the base edge.


Following adjacent edge	Orthogonal to base edge

This option is only applied on the extremities of an edge path. In the upper examples, if the faces are sewed, only the start and end side edges are impacted.