# How to add the 'vn' attribute to the obj file through vtk or other methods

**URL:** https://discourse.vtk.org/t/how-to-add-the-vn-attribute-to-the-obj-file-through-vtk-or-other-methods/9334
**Category:** Support
**Tags:** python
**Created:** [September 13, 2022, 6:07am UTC](https://discourse.vtk.org/t/how-to-add-the-vn-attribute-to-the-obj-file-through-vtk-or-other-methods/9334 "2022-09-13T06:07:23Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![Dwight98](https://discourse.vtk.org/user_avatar/discourse.vtk.org/dwight98/32/5373_2.png) [@Dwight98](https://discourse.vtk.org/u/Dwight98)
#### Post date: [September 13, 2022, 6:07am UTC](https://discourse.vtk.org/t/how-to-add-the-vn-attribute-to-the-obj-file-through-vtk-or-other-methods/9334/1 "2022-09-13T06:07:23Z")

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I have an obj file that contains only point properties and face properties, I want to generate normal vector properties for the file, how do I do it?