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# DMPlexTransformExtrudeGetNormal
Get the extrusion normal vector 
## Synopsis
```
#include "petscdmplextransform.h" 
PetscErrorCode DMPlexTransformExtrudeGetNormal(DMPlexTransform tr, PetscReal normal[])
```
Not Collective


## Input Parameter

- ***tr  -*** The `DMPlexTransform`



## Output Parameter

- ***normal -*** The extrusion direction



## Note
The user passes in an array, which is filled by the library.




## See Also
 `DMPlexTransform`, `DMPlexTransformExtrudeSetNormal()`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/impls/plex/transform/impls/extrude/plextrextrude.c.html#DMPlexTransformExtrudeGetNormal">src/dm/impls/plex/transform/impls/extrude/plextrextrude.c</A>


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