# Why does vtkConnectivityFilter not preserve point or cell data?

**URL:** https://discourse.vtk.org/t/why-does-vtkconnectivityfilter-not-preserve-point-or-cell-data/2284
**Category:** Development
**Created:** [December 15, 2019, 11:13pm UTC](https://discourse.vtk.org/t/why-does-vtkconnectivityfilter-not-preserve-point-or-cell-data/2284 "2019-12-15T23:13:42Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![normanius](https://discourse.vtk.org/user_avatar/discourse.vtk.org/normanius/32/611_2.png) [@normanius](https://discourse.vtk.org/u/normanius)
#### Post date: [December 15, 2019, 11:13pm UTC](https://discourse.vtk.org/t/why-does-vtkconnectivityfilter-not-preserve-point-or-cell-data/2284/1 "2019-12-15T23:13:42Z")

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Dear all

I noticed that [`vtkPolyDataConnectivityFilter`](https://vtk.org/doc/nightly/html/classvtkPolyDataConnectivityFilter.html) doesn’t preserve point or cell data. Any particular reason for this behavior?

I see that the connectivity filter may discard points and cells. Because the remaining poly data isn’t altered, it should be possible that array data is preserved for this remaining parts, shouldn’t it?

I’m running vtk 8.1.

Thanks