# Multiple inputs on a filter

**URL:** https://discourse.paraview.org/t/multiple-inputs-on-a-filter/15378
**Category:** ParaView Support
**Tags:** vtk
**Created:** [September 11, 2024, 2:01pm UTC](https://discourse.paraview.org/t/multiple-inputs-on-a-filter/15378 "2024-09-11T14:01:40Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![Mateus\_Facanha](https://discourse.paraview.org/user_avatar/discourse.paraview.org/mateus_facanha/32/15048_2.png) [@Mateus\_Facanha](https://discourse.paraview.org/u/Mateus_Facanha)
#### Post date: [September 11, 2024, 2:01pm UTC](https://discourse.paraview.org/t/multiple-inputs-on-a-filter/15378/1 "2024-09-11T14:01:40Z")

</div>

I am trying to build a polyline step by step by forming it using a pair of points then merging so they preserve the order that I want, but I got some problems catching the other inputs, I can only use the first one. How can I do this? How do I get the other inputs?

 ![TestesMultiplas](https://discourse.paraview.org/uploads/default/original/2X/1/1a25f71ebd041d575f55066487e41a3ad8852ee6.png)

Every Extract Selection posses a pair of points to form a simple polyline.  
By forming then and merging, I expect to form the outline.