# DMForestSetAdjacencyDimension
During the pre-setup phase, set the dimension of interface points that determine cell adjacency (for the purposes of partitioning and overlap). 
## Synopsis
```
#include "petscdmforest.h" 
#include "petscdm.h" 
#include "petscdmlabel.h" 
PetscErrorCode DMForestSetAdjacencyDimension(DM dm, PetscInt adjDim)
```
Logically collective on dm


## Input Parameters

- ***dm -*** the forest
- ***adjDim -*** default 0 (i.e., vertices determine adjacency)





## See Also
 `DMForestGetAdjacencyDimension()`, `DMForestSetAdjacencyCodimension()`, `DMForestSetPartitionOverlap()`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/impls/forest/forest.c.html#DMForestSetAdjacencyDimension">src/dm/impls/forest/forest.c</A>


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


[Index of all DMForest routines](index.md)  
[Table of Contents for all manual pages](/docs/manualpages/index.md)  
[Index of all manual pages](/docs/manualpages/singleindex.md)  
