Documentation/Nightly/Developers/Tutorials/MigrationGuide/Slicer
MRML: Slicer 4.5: Introduction of vtkMRMLLabelMapVolumeNode
Rational:
Before vtkMRMLScalarVolumeNode was used for both scalar and label map volumes and the LabelMap custom MRML node attribute was used for distinguishing between them (0=scalar; 1=label map volume).
This made conversion between labelmap/scalar volumes very easy but made it difficult to customize behavior, display, processing of segmentation information.
Now a new vtkMRMLLabelMapVolumeNode class is used for storing segmentation information (still using vtkMRMLScalarVolume used as base class for backward compatibility; but in the future the base class may be changed to reflect that segmentation can be represented in various ways, not just as volumes).
Error message similar to:
error: ‘class vtkMRMLScalarVolumeNode’ has no member named ‘SetLabelMap’
outputVolumeNode->SetLabelMap(1);
^
Solution (part1: down cast to vtkMRMLLabelMapVolumeNode, remove call to SetLabelMap)
Replace lines like:
vtkMRMLNode* outputNode = d->OutputLabelVolumeMRMLNodeComboBox->currentNode();
vtkMRMLScalarVolumeNode* outputVolumeNode = vtkMRMLScalarVolumeNode::SafeDownCast(outputNode);
outputVolumeNode->SetOrigin(inputVolumeNode->GetOrigin());
outputVolumeNode->CopyOrientation(inputVolumeNode);
outputVolumeNode->SetAndObserveImageData(m_rssPointer->mp_label_mask);
outputVolumeNode->SetLabelMap(1);
with:
vtkMRMLLabelMapVolumeNode* outputVolumeNode =
vtkMRMLLabelMapVolumeNode::SafeDownCast(d->OutputLabelVolumeMRMLNodeComboBox->currentNode());
outputVolumeNode->SetOrigin(inputVolumeNode->GetOrigin());
outputVolumeNode->CopyOrientation(inputVolumeNode);
outputVolumeNode->SetAndObserveImageData(m_rssPointer->mp_label_mask);
Solution (part2: Update UI file):
Replace lines like:
<widget class="qMRMLNodeComboBox" name="InputLabelVolumeMRMLNodeComboBox">
<property name="nodeTypes">
<stringlist>
<string>vtkMRMLScalarVolumeNode</string>
</stringlist>
</property>
[...]
</widget>
with:
<widget class="qMRMLNodeComboBox" name="InputLabelVolumeMRMLNodeComboBox">
<property name="nodeTypes">
<stringlist>
<string>vtkMRMLLabelMapVolumeNode</string> <------------- Update Here
</stringlist>
</property>
[...]
</widget>
Solution (part3: Update node selector configuration):
Replace lines like:
nodeSelector.setNodeTypes(QStringList("vtkMRMLScalarVolumeNode"));
nodeSelector.addAttribute("vtkMRMLScalarVolumeNode", "LabelMap", "1");
with:
nodeSelector.setNodeTypes(QStringList("vtkMRMLLabelMapVolumeNode"));
References:
