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extend subpanel

extend subpanel

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extend subpanel

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This subpanel extends or retracts the edges of selected surfaces to meet other selected surfaces, or to close gaps between surfaces or holes within a selected surface.

Several options affect how surfaces extension behaves, including enabling or disabling the ability to shorten edges as well as extend them, or to force the extended edges to attempt to maintain the overall shape of the surface.


Panel Input



max extension / extend over edges

Max extension: extend the surface using a maximum extension distance.

Extend over edges: extend a surface over edges to another surface

to surfaces

This choice is available when Extend over edges is selected.  The extending surfaces will extend as far as necessary to meet these ones.

by distance / by thickness multiplier

For by distance, type in the maximum distance that you wish the surfaces to extend.

For by thickness multiplier, type in the multiple of the surfaces' assigned thickness that yields the maximum distance you wish the surfaces to extend.

by filling gaps / by distance / to surfaces

by distance: This is the literal distance that selected edges will extend, measured in the same units that the model was created for.

by filling gaps: extends the edges of the hole to fill the gap.

surfs: to extend selector

Use this selector to pick only the surfaces that you wish to extend.

If you selected any shared (green) or non-manifold (yellow) edges as lines: to extend over, then this selector allows you to specify the corresponding surfaces so that Altair HyperWorks knows which surface to use to determine the plane of extension for the shared/non-manifold edge.

Additionally, you may need to use use this selector to specify any "target" surfaces, particularly if you use the cross extension option described below.  Edges will only extend toward surfaces that are also selected, even if those additional surfaces have no extending edges.  These recipient/target surfaces will also be trimmed, if the trim result surfaces checkbox described below is active.

cross extension / surfs: to target selector

cross extension allows for all input surfaces to be used as both extension and target surfaces. This is useful for doing bulk extensions where all selected surfaces should extend to others within the selection. The input surfaces will not extend beyond the specified max extension distance, nor will any of their edges extend if there are no other surfaces within the max distance.

When selecting this option for extending a surface over an edge, then all selected surface/edge combinations will be extended or shrunk.  Despite the name, in this case the surfaces will not cross through each other; having selected to surfaces ensures that they will meet rather than intersect.

surfs: to target simply extends the surfaces toward other surfaces.  You must use this selector to pick the destination surfaces; the extended surfaces will then extend up to the specified distance to meet those surfaces.  If the target surfaces are too far away, no extension occurs.

When using the surfs: to target option, you can select surfaces already selected as surfs: to extend.  Selecting the same surfaces in both surfs: to extend and surfs: to target produces the same result as the cross extension option.

When selecting this option for extending a surface over an edge, then the surfs: to extend that you have selected edges for in lines: to extend over will extend toward the surfaces that you select with the surfs: to target selector.  The target surface does not need to be selected as an extending surface.

lines: to extend over

Pick the edges that you wish to extend. The surfaces will be extended across these lines.  If you select a free edge, this also selects and highlights the corresponding surface.

surfs: to extend

Pick the surfaces that you wish to extend.

surfs: to target / cross extension

Extended surfaces will extend in the direction of surfaces selected in surfs: to target.

If cross extension is selected, all the selected line and surfaces will be extended.

trim result surfaces

If the checkbox is on and all selected surfaces extend or shorten to have their edges meet, then the selected surfaces will be trimmed or stitched regardless of which components they belong to.  If the checkbox is off, the result varies further:

If the selected surfaces are in the same component, they will not be trimmed but they will be stitched.  This is the default stitching behavior for surfaces in the same component.
If the selected surfs are in different components, they will not be trimmed or stitched.  This is the default stitching behavior for surfaces in different components.  If you need them to be stitched, you must do so by way of edge equivalence (or some other edge editing).


If the checkbox is on and the selected surfaces extend through their target surfaces, or even merely to the interior without actually touching any of the target surface edges, the surfaces will be both trimmed and stitched at the intersection regardless of whether or not they belong to the same component.  However, if the checkbox is off, the surfaces are not trimmed or stitched, since they do not meet at any edges.



See also

Surface Edit panel