# Access coordinates of RectilinearGrid data (Programmable Filter)
**URL:** https://discourse.paraview.org/t/access-coordinates-of-rectilineargrid-data-programmable-filter/9892
**Category:** ParaView Support
**Created:** [June 23, 2022, 9:01am UTC](https://discourse.paraview.org/t/access-coordinates-of-rectilineargrid-data-programmable-filter/9892 "2022-06-23T09:01:16Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@bastian](https://discourse.paraview.org/u/bastian)
#### Post date: [June 23, 2022, 9:01am UTC](https://discourse.paraview.org/t/access-coordinates-of-rectilineargrid-data-programmable-filter/9892/1 "2022-06-23T09:01:16Z")
Does anyone happen to know how to access the coordinates of grid points for a RectilinearGrid from within a programmable filter?
I have given up searching the internet for a solution.
This works, but it’s so slow, it’s unusable:
[https://cvw.cac.cornell.edu/ParaViewAdv/progfilter](https://cvw.cac.cornell.edu/ParaViewAdv/progfilter)
The grid coordinates have to be stored as three 1D vectors somewhere, but how can I access them?
Unfortunately, I don’t have a MWE. If just Paraview had a rectilinear grid source in the Sources menu …
---
### Author:  [@cory.quammen](https://discourse.paraview.org/u/cory.quammen)
#### Post date: [June 23, 2022, 2:53pm UTC](https://discourse.paraview.org/t/access-coordinates-of-rectilineargrid-data-programmable-filter/9892/2 "2022-06-23T14:53:38Z")
You can get the X coordinates array with [vtkRectilinearGrid::GetXCoordinates()](https://vtk.org/doc/nightly/html/classvtkRectilinearGrid.html#aa897412f29bf0ef1350b9bd985248350)
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### Author:  [@bastian](https://discourse.paraview.org/u/bastian)
#### Post date: [June 23, 2022, 3:24pm UTC](https://discourse.paraview.org/t/access-coordinates-of-rectilineargrid-data-programmable-filter/9892/3 "2022-06-23T15:24:50Z")
Ah thanks @cory.quammen, I should pay more attention to the vtk class documentation.
I had checked the python help, but that doesn’t list `GetXCoordinates`.
(My input is actually a `vtkMultiBlockDataSet` containing `vtkRectilinearGrid`s.)
```auto
for ind, (block_in, block_out) in enumerate(zip(inputs[0], output)):
print(help(block_in))
```
shows
where `GetXCoordinates()` is not listed.
However,
```auto
for ind, (block_in, block_out) in enumerate(zip(inputs[0], output)):
print(help(block_in.GetXCoordinates))
```
does indeed show
