View source for Documentation/Nightly/Developers/Tutorials/MigrationGuide/VTK5-to-VTK6

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==Transition from VTK5 to VTK6==

This section documents required change to make Slicer code work with VTK6.

* See [http://www.vtk.org/Wiki/VTK/VTK_6_Migration_Guide VTK_6 Migration Guide]


===Use SetInputPolyDataConnection and GetPolyDataConnection===

Starting with Slicer [http://viewvc.slicer.org/viewvc.cgi/Slicer4?view=revision&revision=24801 r24801], support for VTK5 API was removed and VTK6 API should be used.

<b>Error message similar to:</b>

 error: ‘class vtkMRMLModelDisplayNode’ has no member named ‘SetInputPolyData’
  resultDisplay->SetInputPolyData(resultModel->GetPolyData());
                 ^

<b>Solution:</b>

Replace occurrences of <tt>SetInputPolyData/GetPolyData</tt> with <tt>SetInputPolyDataConnection/GetPolyDataConnection</tt>.

===Use AllocateScalars===

Starting with Slicer [http://viewvc.slicer.org/viewvc.cgi/Slicer4?view=revision&revision=24801 r24801], support for VTK5 API was removed and VTK6 API should be used.

<b>Error message similar to:</b>

   error: no matching function for call to ‘vtkImageData::SetNumberOfScalarComponents(int)’
     mp_phi->SetNumberOfScalarComponents(1);
                                          ^
<b>Solution:</b>

Replace lines like:

  imageData->SetScalarTypeToUnsignedShort();		
  imageData->SetNumberOfScalarComponents(1); // image holds one value intensities		
  imageData->AllocateScalars(); // allocate storage for image data

with:

  imageData->AllocateScalars(VTK_UNSIGNED_SHORT, 1); // allocate storage for image data