This example demonstrates how to extract skin surface from an MRI image using thresholding and smoothing effect of Segment Editor

ExtractSkin.py

import SampleData
sampleDataLogic = SampleData.SampleDataLogic()
masterVolumeNode = sampleDataLogic.downloadMRHead()

# Create segmentation
segmentationNode = slicer.mrmlScene.AddNewNodeByClass("vtkMRMLSegmentationNode")
segmentationNode.CreateDefaultDisplayNodes() # only needed for display
segmentationNode.SetReferenceImageGeometryParameterFromVolumeNode(masterVolumeNode)
addedSegmentID = segmentationNode.GetSegmentation().AddEmptySegment("skin")

# Create segment editor to get access to effects
segmentEditorWidget = slicer.qMRMLSegmentEditorWidget()
segmentEditorWidget.setMRMLScene(slicer.mrmlScene)
segmentEditorNode = slicer.mrmlScene.AddNewNodeByClass("vtkMRMLSegmentEditorNode")
segmentEditorWidget.setMRMLSegmentEditorNode(segmentEditorNode)
segmentEditorWidget.setSegmentationNode(segmentationNode)
segmentEditorWidget.setMasterVolumeNode(masterVolumeNode)

# Thresholding
segmentEditorWidget.setActiveEffectByName("Threshold")
effect = segmentEditorWidget.activeEffect()
effect.setParameter("MinimumThreshold","35")
effect.setParameter("MaximumThreshold","695")
effect.self().onApply()

# Smoothing
segmentEditorWidget.setActiveEffectByName("Smoothing")
effect = segmentEditorWidget.activeEffect()
effect.setParameter("SmoothingMethod", "MEDIAN")
effect.setParameter("KernelSizeMm", 11)
effect.self().onApply()

# Clean up
segmentEditorWidget = None
slicer.mrmlScene.RemoveNode(segmentEditorNode)

# Make segmentation results visible in 3D
segmentationNode.CreateClosedSurfaceRepresentation()

# Write to STL file
slicer.vtkSlicerSegmentationsModuleLogic.ExportSegmentsClosedSurfaceRepresentationToFiles("c:/tmp", segmentationNode, None, "STL")

HI for the last time. I cannot write to STL file.
it returns true but, nothing is outputted. no STL file exists in the path I specified.
Can you help ?