# Constructing iso-contours in parallel

**URL:** https://discourse.vtk.org/t/constructing-iso-contours-in-parallel/7730
**Category:** Support
**Created:** [January 27, 2022, 5:04pm UTC](https://discourse.vtk.org/t/constructing-iso-contours-in-parallel/7730 "2022-01-27T17:04:42Z")
**Posts on this page:** 1
**Page:** 1

<div class="post-metadata">

### Author: ![Robert\_Sawko](https://discourse.vtk.org/user_avatar/discourse.vtk.org/robert_sawko/32/5048_2.png) [@Robert\_Sawko](https://discourse.vtk.org/u/Robert_Sawko)
#### Post date: [January 27, 2022, 5:04pm UTC](https://discourse.vtk.org/t/constructing-iso-contours-in-parallel/7730/1 "2022-01-27T17:04:42Z")

</div>

Hello,

I’ve got a fairly simple pipeline that I intend to use in parallel in-situ runs:

1. `MergeBlocks`
2. `GhostCellsGenerator`
3. `CellDatatoPointData`
4. `Contour`

I have described the reason for doing it [here](https://discourse.paraview.org/t/how-to-compute-contours-in-parallel/7046/3). This seems to be working as expected, but in larger runs I am getting dozens of errors. It seems that the errors are caused mainly by ranks which do not contain a contour running through it.

Can I ask if there’s any better way to construct contours in parallel? Alternatively is it possibly to suppress the error from `errorMacro`?

Please let me know.