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# DMPlexCreateGmsh
Create a `DMPLEX` mesh from a Gmsh file viewer 
## Synopsis
```
#include "petscdmplex.h"   
PetscErrorCode DMPlexCreateGmsh(MPI_Comm comm, PetscViewer viewer, PetscBool interpolate, DM *dm)
```
Collective


## Input Parameters

- ***comm  -*** The MPI communicator
- ***viewer -*** The `PetscViewer` associated with a Gmsh file
- ***interpolate -*** Create faces and edges in the mesh



## Output Parameter

- ***dm  -*** The `DM` object representing the mesh



## Options Database Keys

- ***-dm_plex_gmsh_hybrid        -*** Force triangular prisms to use tensor order
- ***-dm_plex_gmsh_periodic      -*** Read Gmsh periodic section and construct a periodic Plex
- ***-dm_plex_gmsh_highorder     -*** Generate high-order coordinates
- ***-dm_plex_gmsh_project       -*** Project high-order coordinates to a different space, use the prefix dm_plex_gmsh_project_ to define the space
- ***-dm_plex_gmsh_use_regions   -*** Generate labels with region names
- ***-dm_plex_gmsh_mark_vertices -*** Add vertices to generated labels
- ***-dm_plex_gmsh_multiple_tags -*** Allow multiple tags for default labels
- ***-dm_plex_gmsh_spacedim <d>  -*** Embedding space dimension, if different from topological dimension



## Note
The Gmsh file format is described in http://gmsh.info/doc/texinfo/gmsh.html#MSH-file-format

By default, the "Cell Sets", "Face Sets", and "Vertex Sets" labels are created, and only insert the first tag on a point. By using -dm_plex_gmsh_multiple_tags, all tags can be inserted. Instead, -dm_plex_gmsh_use_regions creates labels based on the region names from the PhysicalNames section, and all tags are used.




## See Also
 [](ch_unstructured), `DM`, `DMPLEX`, `DMCreate()`

## Level
beginner

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


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