# PetscViewerGLVisOpen
Opens a `PETSCVIEWERGLVIS` `PetscViewer` 
## Synopsis
```
#include "petscviewer.h" 
#include "petscsys.h"    
PetscErrorCode PetscViewerGLVisOpen(MPI_Comm comm, PetscViewerGLVisType type, const char name[], PetscInt port, PetscViewer *viewer)
```
Collective; No Fortran Support


## Input Parameters

- ***comm      -*** the MPI communicator
- ***type      -*** the viewer type: `PETSC_VIEWER_GLVIS_SOCKET` for real-time visualization or `PETSC_VIEWER_GLVIS_DUMP` for dumping to a file
- ***name      -*** either the hostname where the GLVis server is running or the base filename for dumping the data for subsequent visualizations
- ***port      -*** socket port where the GLVis server is listening. Not referenced when type is `PETSC_VIEWER_GLVIS_DUMP`



## Output Parameters

- ***viewer    -*** the `PetscViewer` object



## Options Database Keys

- ***-glvis_precision <precision> -*** Sets number of digits for floating point values
- ***-glvis_size <width,height> -*** Sets the window size (in pixels)
- ***-glvis_pause <pause> -*** Sets time (in seconds) that the program pauses after each visualization
(0 is default, -1 implies every visualization)
- ***-glvis_keys -*** Additional keys to configure visualization
- ***-glvis_exec -*** Additional commands to configure visualization





## See Also
 [](sec_viewers), `PETSCVIEWERGLVIS`, `PetscViewerCreate()`, `PetscViewerSetType()`, `PetscViewerGLVisType`

## Level
beginner

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/sys/classes/viewer/impls/glvis/glvis.c.html#PetscViewerGLVisOpen">src/sys/classes/viewer/impls/glvis/glvis.c</A>

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/ksp/tutorials/ex43.c.html">src/ksp/ksp/tutorials/ex43.c.html</A><BR>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/sys/classes/viewer/impls/glvis/glvis.c)


[Index of all Viewer routines](index.md)  
[Table of Contents for all manual pages](/docs/manualpages/index.md)  
[Index of all manual pages](/docs/manualpages/singleindex.md)  
