# DMPlexSetReferenceTree
set the reference tree for hierarchically non-conforming meshes. 
## Synopsis
```
#include "petscdmplex.h"   
PetscErrorCode DMPlexSetReferenceTree(DM dm, DM ref)
```
Not collective


## Input Parameters

- ***dm -*** The `DMPLEX` object
- ***ref -*** The reference tree `DMPLEX` object





## See Also
 [](chapter_unstructured), `DM`, `DMPLEX`,`DMPlexGetReferenceTree()`, `DMPlexCreateDefaultReferenceTree()`

## Level
intermediate

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


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


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