# Use output of filter for input of other filters

**URL:** https://discourse.paraview.org/t/use-output-of-filter-for-input-of-other-filters/12834
**Category:** ParaView Support
**Created:** [September 8, 2023, 1:40pm UTC](https://discourse.paraview.org/t/use-output-of-filter-for-input-of-other-filters/12834 "2023-09-08T13:40:55Z")
**Posts on this page:** 1
**Showing post:** 3

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### Author: ![otaolafr](https://discourse.paraview.org/user_avatar/discourse.paraview.org/otaolafr/32/3595_2.png) [@otaolafr](https://discourse.paraview.org/u/otaolafr)
#### Post date: [September 8, 2023, 3:23pm UTC](https://discourse.paraview.org/t/use-output-of-filter-for-input-of-other-filters/12834/3 "2023-09-08T15:23:23Z")

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Hello mathieu,  
but from servermanager.fetch I get a vtk object that from this sometimes there are some properties sometimes not… for example here it is used this after the servermanager.fetch  
`calc_vtk.GetPointData()` [link](https://discourse.paraview.org/t/use-the-output-of-the-calculator-filter-in-pvpython/10400/2) where `calc_vtk` is the result of `servermanager.fetch(filter)` but for example if I do the following I get an empty result:

```auto
import paraview.servermanager as sm
s=Sphere(Radius=10)
boundingRuler1 = BoundingRuler(registrationName='boundingRuler1', Input=s, Axis = 'X Axis')
ruler = sm.Fetch(boundingRuler1)
ruler.GetPointData().GetArray('Points')

```

what I am missing? the boundingRuler has point data and also has the array Points

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