:orphan:
# DMPlexCreateDefaultReferenceTree
create a reference tree for isotropic hierarchical mesh refinement. 
## Synopsis
```
#include "petscdmplex.h"   
PetscErrorCode DMPlexCreateDefaultReferenceTree(MPI_Comm comm, PetscInt dim, PetscBool simplex, DM *ref)
```
Collective


## Input Parameters

- ***comm    -*** the MPI communicator
- ***dim     -*** the spatial dimension
- ***simplex -*** Flag for simplex, otherwise use a tensor-product cell



## Output Parameter

- ***ref     -*** the reference tree `DMPLEX` object





## See Also
 `DMPlexSetReferenceTree()`, `DMPlexGetReferenceTree()`

## Level
intermediate

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


---
[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](/manualpages/index.md)  
[Index of all manual pages](/manualpages/singleindex.md)