---
name: "freefoam-surfaceSplitNonManifolds"
section: "1"
platform: "linux"
package: "freefoam"
version: "0.1.0+dfsg+1-3"
release: "Debian 8 (Jessie)"
platforms: ["linux"]
url: "https://new.carta.tech/freefoam-surfaceSplitNonManifolds"
---

# freefoam-surfaceSplitNonManifolds(1)

Takes multiply connected surface and tries to split surface at multiply connected edges by duplicating points.

## NAME

freefoam-surfaceSplitNonManifolds - Takes multiply connected surface and tries to split surface at multiply connected edges by duplicating points.

## SYNOPSIS

**freefoam surfaceSplitNonManifolds** *\<Foam surface file\>* *\<surface output file\>* \[-case *\<dir\>*\] \[-srcDoc\] \[-debug\] \[-doc\] \[-help\]

## DESCRIPTION

Introduces concept of - borderEdge. Edge with 4 faces connected to it. - borderPoint. Point connected to exactly 2 borderEdges. - borderLine. Connected list of borderEdges.

By duplicating borderPoints this will split *borderLines*. As a preprocessing step it can detect borderEdges without any borderPoints and explicitly split these triangles.

The problems in this algorithm are: - determining which two (of the four) faces form a surface. Done by walking face-edge-face while keeping and edge or point on the borderEdge borderPoint. - determining the outwards pointing normal to be used to slightly offset the duplicated point.

Uses sortedEdgeFaces quite a bit.

Is tested on simple borderLines resulting from extracting a surface from a hex mesh. Will quite possibly go wrong on more complicated border lines (i.e. ones forming a loop).

Dumps surface every so often since might take a long time to complete.

## OPTIONS

*\<Foam surface file\>*

**TODO** Detailed description of argument.

*\<surface output file\>*

**TODO** Detailed description of argument.

- **-debug**

  Generate debugging output.

- **-case** *\<dir\>*

  Case directory.

- **-help**

  Display help message.

- **-doc**

  Display Doxygen API documentation page for this application.

- **-srcDoc**

  Display Doxygen source documentation page for this application.

## SEE ALSO

An overview of FreeFOAM is given in [**freefoam**(1)](/freefoam/1.md).

## AUTHOR

OpenCFD Ltd.

## FREEFOAM

Part of the [**freefoam**(1)](/freefoam/1.md) suite.

## COPYRIGHT

• Copyright © 2008-2012 Michael Wild.

• Copyright © 1991-2010 OpenCFD Ltd.