# From labelmap to model and from model to labelmap python scripts
**URL:** https://discourse.slicer.org/t/from-labelmap-to-model-and-from-model-to-labelmap-python-scripts/15833
**Category:** Support
**Created:** [February 4, 2021, 9:35am UTC](https://discourse.slicer.org/t/from-labelmap-to-model-and-from-model-to-labelmap-python-scripts/15833 "2021-02-04T09:35:00Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@brhoom](https://discourse.slicer.org/u/brhoom)
#### Post date: [February 4, 2021, 9:35am UTC](https://discourse.slicer.org/t/from-labelmap-to-model-and-from-model-to-labelmap-python-scripts/15833/1 "2021-02-04T09:35:01Z")
Dear all,
I wrote these to functions to convert between labelmap and model nodes. Is there a similar simple non-slicer solution e.g. using only itk and vtk?
```
def lbl2model(lblNode,lblName):
segNode = slicer.mrmlScene.AddNewNodeByClass("vtkMRMLSegmentationNode")
segNode.SetName(lblName)
slicer.modules.segmentations.logic().ImportLabelmapToSegmentationNode(lblNode, segNode)
modelHNode = slicer.mrmlScene.AddNewNodeByClass("vtkMRMLModelHierarchyNode")
slicer.modules.segmentations.logic().ExportAllSegmentsToModelHierarchy(segNode, modelHNode)
vColls = vtk.vtkCollection()
modelHNode.GetChildrenModelNodes(vColls)
modelNode = vColls.GetItemAsObject(0)
return modelNode
def model2lbl(modelNode,modelName,refNode):
segNode = slicer.mrmlScene.AddNewNodeByClass("vtkMRMLSegmentationNode")
segNode.SetName(modelName)
slicer.modules.segmentations.logic().ImportModelToSegmentationNode(modelNode,segNode)
labelmapVolumeNode =
slicer.mrmlScene.AddNewNodeByClass("vtkMRMLLabelMapVolumeNode")
labelmapVolumeNode.SetName(modelName)
ids = vtk.vtkStringArray()
segNode.GetDisplayNode().GetVisibleSegmentIDs(ids)
slicer.modules.segmentations.logic().ExportSegmentsToLabelmapNode(segNode, ids,labelmapVolumeNode, refNode)
return labelmapVolumeNode
```
---
### Author:  [@lassoan](https://discourse.slicer.org/u/lassoan)
#### Post date: [February 4, 2021, 2:22pm UTC](https://discourse.slicer.org/t/from-labelmap-to-model-and-from-model-to-labelmap-python-scripts/15833/2 "2021-02-04T14:22:34Z")
All these methods use VTK filters - about 5-10 processing steps, including various smoothing, cleaning, simplification, etc. to make the conversion more robust and accurate. You can find the exact steps in “conversion rule” classes [here](https://github.com/Slicer/Slicer/tree/master/Libs/vtkSegmentationCore). ITK does not have that many surface mesh processing filters, but it can do basic conversion between labelmaps and surfaces.
Note that you can run Slicer scripts from the command-line and you can use any Python package in Slicer’s virtual Python environment as you would use any other Python virtual environments.
---
### Author:  [@brhoom](https://discourse.slicer.org/u/brhoom)
#### Post date: [February 4, 2021, 3:27pm UTC](https://discourse.slicer.org/t/from-labelmap-to-model-and-from-model-to-labelmap-python-scripts/15833/3 "2021-02-04T15:27:36Z")
> All these methods use VTK filters - about 5-10 processing steps, including various smoothing, cleaning, simplification, etc. to make the conversion more robust and accurate. You can find the exact steps in “conversion rule” classes [here](https://github.com/Slicer/Slicer/tree/master/Libs/vtkSegmentationCore). ITK does not have that many surface mesh processing filters, but it can do basic conversion between labelmaps and surfaces.
Thanks for your informative and quick reply, I will have a look at the link.
> Note that you can run Slicer scripts from the command-line and you can use any Python package in Slicer’s virtual Python environment as you would use any other Python virtual environments
This is what I am using now.