:orphan:
# DMPlexConstructCohesiveCells
Construct cohesive cells which split the face along an internal interface
## Synopsis
```
#include "petscdmplex.h"
#include "petscdmlabel.h"
PetscErrorCode DMPlexConstructCohesiveCells(DM dm, DMLabel label, DMLabel splitLabel, DM *dmSplit)
```
Collective
## Input Parameters
- ***dm -*** The original `DM`
- ***label -*** The `DMLabel` specifying the boundary faces (this could be auto-generated)
## Output Parameters
- ***splitLabel -*** The `DMLabel` containing the split points, or `NULL` if no output is desired
- ***dmSplit -*** The new `DM`
## See Also
[](ch_unstructured), `DM`, `DMPLEX`, `DMCreate()`, `DMPlexLabelCohesiveComplete()`
## Level
developer
## Location
src/dm/impls/plex/plexsubmesh.c
## Implementations
DMPlexConstructCohesiveCells_Internal in src/dm/impls/plex/plexsubmesh.c
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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/dm/impls/plex/plexsubmesh.c)
[Index of all DMPlex routines](index.md)
[Table of Contents for all manual pages](/manualpages/index.md)
[Index of all manual pages](/manualpages/singleindex.md)