# DMPlexTransformGetSourcePoint
Get the number of a point in the original mesh based on information from the transformed mesh. 
## Synopsis
```
#include "petscdmplextransform.h" 
PetscErrorCode DMPlexTransformGetSourcePoint(DMPlexTransform tr, PetscInt pNew, DMPolytopeType *ct, DMPolytopeType *ctNew, PetscInt *p, PetscInt *r)
```
Not collective


## Input Parameters

- ***tr    -*** The `DMPlexTransform`
- ***pNew  -*** The new point number



## Output Parameters

- ***ct    -*** The type of the original point which produces the new point
- ***ctNew -*** The type of the new point
- ***p     -*** The original point which produces the new point
- ***r     -*** The replica number of the new point, meaning it is the rth point of type ctNew produced from p





## See Also
 [](chapter_unstructured), `DM`, `DMPLEX`, `DMPlexTransform`, `DMPolytopeType`, `DMPlexTransformGetTargetPoint()`, `DMPlexTransformCellTransform()`

## Level
developer

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/impls/plex/transform/interface/plextransform.c.html#DMPlexTransformGetSourcePoint">src/dm/impls/plex/transform/interface/plextransform.c</A>


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