Documentation/Nightly/Developers/Tutorials/MigrationGuide/Slicer

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Migration Guide

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->SetLabelMap(1);


with: 

    vtkMRMLLabelMapVolumeNode* outputVolumeNode =
      vtkMRMLLabelMapVolumeNode::SafeDownCast(d->OutputLabelVolumeMRMLNodeComboBox->currentNode());
    [...]


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:


CLI: Slicer 4.3: Add ITKFactoryRegistration library centralizing ITK IO factory registration

Rational: 

 Linking against ITKFactoryRegistration ensures that ITK IO factory are properly registered on all supported platforms.

Error message similar to: 

 Undefined symbols for architecture x86_64:
 "itk::itkFactoryRegistration()", referenced from:
 _main in ImageMakerTest.cxx.o
 ld: symbol(s) not found for architecture x86_64

Solution:

Replace lines like: 

 target_link_libraries(${CLP}Test ${CLP}Lib)

with: 

 target_link_libraries(${CLP}Test ${CLP}Lib ${SlicerExecutionModel_EXTRA_EXECUTABLE_TARGET_LIBRARIES})

References:

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