# I found a bug in the function vtkArcSource::RequestData.

**URL:** https://discourse.vtk.org/t/i-found-a-bug-in-the-function-vtkarcsource-requestdata/10026
**Category:** Support
**Tags:** code
**Created:** [December 1, 2022, 2:24am UTC](https://discourse.vtk.org/t/i-found-a-bug-in-the-function-vtkarcsource-requestdata/10026 "2022-12-01T02:24:38Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![MincheolKim](https://discourse.vtk.org/letter_avatar_proxy/v4/letter/m/35a633/32.png) [@MincheolKim](https://discourse.vtk.org/u/MincheolKim)
#### Post date: [December 1, 2022, 2:24am UTC](https://discourse.vtk.org/t/i-found-a-bug-in-the-function-vtkarcsource-requestdata/10026/1 "2022-12-01T02:24:38Z")

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Hi all,

I used vtkArcSource.  
I found a bug which is radius change to be 1.  
You can see below in the function vtkArcSource::RequestData in the vtkArcSource.cpp file.  
**// Calculate radius**  
**radius = vtkMath::Normalize(v1);**

Please, fix this bug.  
Thank you.

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<div class="post-metadata">

### Author: ![Francois\_Mazen](https://discourse.vtk.org/user_avatar/discourse.vtk.org/francois_mazen/32/3290_2.png) [@Francois\_Mazen](https://discourse.vtk.org/u/Francois_Mazen)
#### Post date: [December 2, 2022, 7:47am UTC](https://discourse.vtk.org/t/i-found-a-bug-in-the-function-vtkarcsource-requestdata/10026/2 "2022-12-02T07:47:37Z")

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Hi @MincheolKim

Could you please open an issue on the VTK gitlab with the steps to reproduce the issue?  
[https://gitlab.kitware.com/vtk/vtk/-/issues/new](https://gitlab.kitware.com/vtk/vtk/-/issues/new)

Thanks!