# DMPlexTopologyLoad
Loads a topology into a `DMPLEX` 
## Synopsis
```
#include "petscdmplex.h"   
PetscErrorCode DMPlexTopologyLoad(DM dm, PetscViewer viewer, PetscSF *globalToLocalPointSF)
```
Collective on dm


## Input Parameters

- ***dm                -*** The `DM` into which the topology is loaded
- ***viewer            -*** The `PetscViewer` for the saved topology



## Output Parameters

- ***globalToLocalPointSF -*** The `PetscSF` that pushes points in [0, N) to the associated points in the loaded plex, where N is the global number of points; NULL if unneeded





## See Also
 [](chapter_unstructured), `DM`, `DMPLEX`, `DMLoad()`, `DMPlexCoordinatesLoad()`, `DMPlexLabelsLoad()`, `DMView()`, `PetscViewerHDF5Open()`, `PetscViewerPushFormat()`,
`PetscViewer`, `PetscSF`

## Level
advanced

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


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