# Bug in STEP reader's \`Read Wire\` option?
**URL:** https://discourse.paraview.org/t/bug-in-step-readers-read-wire-option/17551
**Category:** ParaView Support
**Created:** [May 5, 2026, 9:46pm UTC](https://discourse.paraview.org/t/bug-in-step-readers-read-wire-option/17551 "2026-05-05T21:46:08Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@GregVernon](https://discourse.paraview.org/u/GregVernon)
#### Post date: [May 5, 2026, 9:46pm UTC](https://discourse.paraview.org/t/bug-in-step-readers-read-wire-option/17551/1 "2026-05-05T21:46:08Z")
Below is a STEP file of a knuckle geometry. Here’s what it looks like rendered in Coreform Cubit:
And here’s what it looks like in ParaView if I `Read Wire` and then `Extract Cells by Type` for surfaces and lines (state file at the bottom).
It looks like the lines terminate prematurely (or start late?) and some curves don’t even exist at all.
[knuckle.stp](https://discourse.paraview.org/uploads/short-url/dVuagtzPvw7OPWAPsPGPIGia2pK.stp) (55.5 KB)
[knuckle\_step.pvsm](https://discourse.paraview.org/uploads/short-url/y9gogCZ9Au6uaN0jn0MoqSdZS6.pvsm) (463.7 KB)
```auto
Client Information:
Version: 6.1.0
VTK Version: 9.6.1
Qt Version: 6.9.0
vtkIdType size: 64bits
Embedded Python: On
Python Library Path: C:\Program Files\ParaView 6.1.0\bin\Lib
Python Library Version: 3.12.7 (tags/v3.12.7:0b05ead, Oct 1 2024, 03:06:41) [MSC v.1941 64 bit (AMD64)]
Python Numpy Support: On
Python Numpy Path: C:\Program Files\ParaView 6.1.0\bin\lib\site-packages\numpy
Python Numpy Version: 1.26.4
Python Matplotlib Support: On
Python Matplotlib Path: C:\Program Files\ParaView 6.1.0\bin\lib\site-packages\matplotlib
Python Matplotlib Version: 3.7.2
Python Testing: Off
MPI Enabled: Off
ParaView Build ID: superbuild af9bb3207d40b64f97c64a9c319d483ff3b17d03 (!1332)
Disable Registry: Off
Test Directory:
Data Directory:
SMP Backend: TBB
SMP Max Number of Threads: 16
OpenGL Vendor: NVIDIA Corporation
OpenGL Version: 3.2.0 NVIDIA 595.79
OpenGL Renderer: NVIDIA GeForce RTX 3050 Ti Laptop GPU/PCIe/SSE2
Accelerated filters overrides available: No
Connection Information:
Remote Connection: No
```
---
### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [May 6, 2026, 7:31am UTC](https://discourse.paraview.org/t/bug-in-step-readers-read-wire-option/17551/2 "2026-05-06T07:31:06Z")
Indeed, confirmed:
Please open an issue.
---
### Author:  [@GregVernon](https://discourse.paraview.org/u/GregVernon)
#### Post date: [May 6, 2026, 2:47pm UTC](https://discourse.paraview.org/t/bug-in-step-readers-read-wire-option/17551/3 "2026-05-06T14:47:14Z")
Done: [https://gitlab.kitware.com/paraview/paraview/-/work\_items/23274](https://gitlab.kitware.com/paraview/paraview/-/work_items/23274)