# How to set GroupIds (c1) in object (.obj) file?

**URL:** https://discourse.paraview.org/t/how-to-set-groupids-c1-in-object-obj-file/1946
**Category:** Web Support
**Created:** [May 28, 2019, 3:42pm UTC](https://discourse.paraview.org/t/how-to-set-groupids-c1-in-object-obj-file/1946 "2019-05-28T15:42:05Z")
**Posts on this page:** 1
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### Author: ![jourdain](https://discourse.paraview.org/user_avatar/discourse.paraview.org/jourdain/32/11_2.png) [@jourdain](https://discourse.paraview.org/u/jourdain)
#### Post date: [August 5, 2019, 3:49pm UTC](https://discourse.paraview.org/t/how-to-set-groupids-c1-in-object-obj-file/1946/3 "2019-08-05T15:49:01Z")

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The VTK reader of OBJ does not actually split the geometry in group such as a multi-block. But in vtk.js we do have that freedom. Taking the vtk.js implementation of the OBJ reader and converting it in Python as a Python Plugin Source would allow you to produce a multiblock and start leveraging coloring and visibility control within ParaView and therefore in Visualizer.

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