Option

Description

min. angle between surfaces

Surfaces whose angle relative to one another is less than this value will not be extended toward each other.

max edge to surface angle

Edges that you wish to extend must not be too drastically angled relative to the target surfaces.  Edges angled greater than this number of degrees relative to their target surfaces will fail to extend.

allow shortening

Allows surfaces to be shortened rather than extended if they extend less than the max extension distance beyond another input surface edge.

allow inter-comp extension

This option allows you to extend surfaces toward surfaces that exist in a different component.  When disabled, you can only extend surfaces to other surfaces within the same component.

use guide edges

Edge extensions without this option are straightforward, with edges extending along their normal.  With this option, the extension uses the edges adjacent to each extending edge as an indicator to trim the extended surface and maintain a similar shape for the surface.  In addition, when using the extend over edges method instead of the max extension method, a new lines: guide edges to ignore selector allows you to pick adjacent edges to omit from consideration as guides.

You can also automatically exclude some edges from consideration as guides by means of the minimum angle to guide edge field.  Edges less than this angle relative to the extended edge will not be used as guides.  This  limit works for both the extend over edges and max extension methods.

There are some cases when the use of guide edges are a necessity to avoid undesirable results; one such example involves trapezoidal or similarly four-sided yet non-rectangular surfaces.

create new surfaces for extension

Instead of extending the existing surface, a new surfaces is created to fill the gap between the original surface and the target of the extension.  The original surface is left unchanged.  Activating this checkbox requires you to select an additional option:

create in:

Determines what component extensions are created in: the original surfaces' component, or a new extended surfaces component.

When original component is selected, the extended surfaces (including any new surfaces created via the create new surfaces for extension option) remain in the extended surfaces' beginning components.

When extended surfaces component is selected, the original surfaces are copied into a new extended surfaces component and all extension operations are performed on those copies within the new component.