:orphan:
# DMPlexSetIsoperiodicFaceSF
Express periodicity from an existing mesh 
## Synopsis
```
#include "petscdmplex.h"   
PetscErrorCode DMPlexSetIsoperiodicFaceSF(DM dm, PetscSF face_sf)
```
Logically Collective


## Input Parameters

- ***dm -*** The `DMPLEX` on which to set periodicity
- ***face_sf -*** `PetscSF` in which roots are (owned) donor faces and leaves are faces that must be matched to a (possibly remote) donor face.





## Note
One can use `-dm_plex_shape zbox` to use this mode of periodicity, wherein the periodic points are distinct both globally
and locally, but are paired when creating a global dof space.


## See Also
 [](ch_unstructured), `DMPLEX`, `DMGetGlobalSection()`, `DMPlexGetIsoperiodicFaceSF()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/impls/plex/plexsfc.c.html#DMPlexSetIsoperiodicFaceSF">src/dm/impls/plex/plexsfc.c</A>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/dm/impls/plex/plexsfc.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)