:orphan:
# DMPolytopeGetVertexOrientation
Determine an orientation (transformation) that takes the source vertex arrangement to the target vertex arrangement 
## Synopsis
```
#include "petscdm.h"          
#include "petscdmlabel.h"     
#include "petscds.h"     
PetscErrorCode DMPolytopeGetVertexOrientation(DMPolytopeType ct, const PetscInt sourceCone[], const PetscInt targetCone[], PetscInt *ornt)
```
Not Collective


## Input Parameters

- ***ct         -*** The `DMPolytopeType`
- ***sourceCone -*** The source arrangement of vertices
- ***targetCone -*** The target arrangement of vertices



## Output Parameter

- ***ornt  -*** The orientation (transformation) which will take the source arrangement to the target arrangement





## Note
This function is the same as `DMPolytopeMatchVertexOrientation()` except it errors if not orientation is possible.


## Developer Note
It is unclear why this function needs to exist since one can simply call `DMPolytopeMatchVertexOrientation()` and error if none is found


## See Also
 [](ch_dmbase), `DM`, `DMPolytopeType`, `DMPolytopeMatchVertexOrientation()`, `DMPolytopeGetOrientation()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/interface/dm.c.html#DMPolytopeGetVertexOrientation">src/dm/interface/dm.c</A>


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