# How to use Python to achieve the thresholding effect of the ‘Volumes’ module? (synchronized with the volume rendering)
**URL:** https://discourse.slicer.org/t/how-to-use-python-to-achieve-the-thresholding-effect-of-the-volumes-module-synchronized-with-the-volume-rendering/20891
**Category:** Support
**Tags:** threshold, python, volume-rendering
**Created:** [December 2, 2021, 10:13pm UTC](https://discourse.slicer.org/t/how-to-use-python-to-achieve-the-thresholding-effect-of-the-volumes-module-synchronized-with-the-volume-rendering/20891 "2021-12-02T22:13:31Z")
**Posts on this page:** 3
**Page:** 3
### Author:  [@dalv.silvermann](https://discourse.slicer.org/u/dalv.silvermann)
#### Post date: [August 2, 2022, 9:56am UTC](https://discourse.slicer.org/t/how-to-use-python-to-achieve-the-thresholding-effect-of-the-volumes-module-synchronized-with-the-volume-rendering/20891/43 "2022-08-02T09:56:16Z")
Hi to all Discoursers here! I’v got a lot knowledge from this resource. Thank you very much ya all!
Plese, help me to find:
1. How I can set the checkbox called “Synchronize with volumes module” in module called “Volume Rendering” from python code? How I can set it for a chosen volume (set only for special volume name with slicer.mrmlScene.GetFirstNodeByName())
2. How I can set it by default always “On” at start of the Slicer?
Thank ya all!
---
### Author:  [@pieper](https://discourse.slicer.org/u/pieper)
#### Post date: [August 2, 2022, 3:07pm UTC](https://discourse.slicer.org/t/how-to-use-python-to-achieve-the-thresholding-effect-of-the-volumes-module-synchronized-with-the-volume-rendering/20891/44 "2022-08-02T15:07:36Z")
The steps described here should work for you:
[https://slicer.readthedocs.io/en/latest/developer\_guide/python\_faq.html#how-to-find-a-python-function-for-any-slicer-features](https://slicer.readthedocs.io/en/latest/developer_guide/python_faq.html#how-to-find-a-python-function-for-any-slicer-features)
---
### Author:  [@dalv.silvermann](https://discourse.slicer.org/u/dalv.silvermann)
#### Post date: [August 2, 2022, 9:35pm UTC](https://discourse.slicer.org/t/how-to-use-python-to-achieve-the-thresholding-effect-of-the-volumes-module-synchronized-with-the-volume-rendering/20891/45 "2022-08-02T21:35:34Z")
Thank you very much! Your advice helped me to find the way, it was definitely what I need to know in regard to all GUI elements in the Slicer. This code is work for me:
```auto
volumeRenderingWidgetRep.setMRMLVolumeNode(slicer.mrmlScene.GetNodeByID('vtkMRMLScalarVolumeNode11'))
volumeRenderingWidgetRep = slicer.modules.volumerendering.widgetRepresentation()
volumeRenderingWidgetRep.mrmlDisplayNode().GetFollowVolumeDisplayNode()
followGet = volumeRenderingWidgetRep.mrmlDisplayNode().GetFollowVolumeDisplayNode()
followSet = volumeRenderingWidgetRep.mrmlDisplayNode().SetFollowVolumeDisplayNode(1)
volumeName = "635166: AXIAL cropped_9"
volNode = getNode(volumeName)
dispNode = volNode.GetDisplayNode()
lowerThreshValue = 267
upperThreshValue = 32767
dispNode.SetThreshold(lowerThreshValue, upperThreshValue)
volNode.GetDisplayNode().ApplyThresholdOn()
```
Need to note, that `'vtkMRMLScalarVolumeNode11'` and `"635166: AXIAL cropped_9"` is the same node :0)
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