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# DMPlexGetRefinementFunction
Get the function giving the maximum cell volume for refinement 
## Synopsis
```
#include "petscdmplex.h"   
PetscErrorCode DMPlexGetRefinementFunction(DM dm, PetscErrorCode (**refinementFunc)(const PetscReal[], PetscReal *))
```

## Input Parameter

- ***dm -*** The `DM`



## Output Parameter

- ***refinementFunc -*** Function giving the maximum cell volume in the refined mesh



## Calling Sequence of `refinementFunc`
```none
PetscErrorCode refinementFunc(const PetscReal coords[], PetscReal *limit)
```

- ***coords -*** Coordinates of the current point, usually a cell centroid
- ***limit  -*** The maximum cell volume for a cell containing this point





## See Also
 [](ch_unstructured), `DM`, `DMPLEX`, `DMRefine()`, `DMPlexSetRefinementFunction()`, `DMPlexGetRefinementUniform()`, `DMPlexSetRefinementUniform()`, `DMPlexGetRefinementLimit()`, `DMPlexSetRefinementLimit()`

## Level
developer

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


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