:orphan:
# DMPlexCreateEphemeral
This takes a `DMPlexTransform` and a base `DMPlex` and produces an ephemeral `DM`, meaning one that is created on the fly in response to queries.
## Synopsis
```
#include "petscdmplex.h"
#include "petscdmplex.h"
PetscErrorCode DMPlexCreateEphemeral(DMPlexTransform tr, DM *dm)
```
## Input Parameter
- ***tr -*** The `DMPlexTransform`
## Output Parameter
- ***dm -*** The `DM`
## Notes
An emphemeral mesh is one that is not stored concretely, as in the default `DMPLEX` implementation, but rather is produced on the fly in response to queries, using information from the transform and the base mesh.
## See Also
`DMPlexCreateFromFile`, `DMPlexCreateFromDAG()`, `DMPlexCreateFromCellListPetsc()`, `DMPlexCreate()`
## Level
beginner
## Location
src/dm/impls/plex/plexcreate.c
## Examples
src/dm/label/tutorials/ex1.c
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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/dm/impls/plex/plexcreate.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)