[vtk-developers] Started on VTK 4 compatibility removal

[Berk Geveci]

Hi folks,

For those that are interested, I started working on removing the VTK 4
backwards compatibility layer as described here:

http://www.vtk.org/Wiki/VTK/Remove_VTK_4_Compatibility

I am going to regularly send updates to mailing list so that folks can
try out these changes and see if they break their own code. For now, I
am publishing a branch called remove-vtk-4-compatibility to
https://gitorious.org/~berkgeveci/kitware/berkgevecis-vtk. In the near
future, there will be a branch in the VTK stage as well.

My changes so far:

- I removed vtkProcessObject and all of its subclasses (including
vtkSource). A list of files I removed is at the bottom. If you have a
subclass of any of these, you have to change it to subclass from
vtkAlgorithm or one of its subclasses.

- I removed vtkPLOT3DReader. This reader created one output per block
in the file. VTK no longer supports variable number of outputs. Such
readers/filters should be converted to produce multi-block datasets.
The replacement for this filter is vtkMultiBlockPLOT3DReader. In the
future, I will probably rename it to be vtkPLOT3DReader.

- I changed vtkSpatialRepresentationFilter to produce a multi-block
dataset for the same reason as with vtkPLOT3DReader. I also had to
change the API as which output the filter produced was dependent on
the GetOutput() method which I had to remove. See the header file for
details.

- I removed vtkPOPReader. This is a clean-up. This class never passed
development stage and the POP flavor it loaded was in-house to
Kitware.

I am currently working on changes that are likely to have an impact on
some of the never code. I am removing the dependency of vtkDataObject
on the pipeline. This means that any code that did something like:

output->SetWholeExtent(...);

or

output->GetWholeExtent(...);

will break. More on this next time.

Please feel free to ask questions.

Best,
-berk


vtkProcessObject and subclasses removed:
 Filtering/vtkDataObjectSource.cxx Filtering/vtkDataObjectSource.h
 Filtering/vtkDataSetSource.cxx Filtering/vtkDataSetSource.h
 Filtering/vtkDataSetToDataSetFilter.cxx
 Filtering/vtkDataSetToDataSetFilter.h
 Filtering/vtkDataSetToImageFilter.cxx
 Filtering/vtkDataSetToImageFilter.h
 Filtering/vtkDataSetToPolyDataFilter.cxx
 Filtering/vtkDataSetToPolyDataFilter.h
 Filtering/vtkDataSetToStructuredGridFilter.cxx
 Filtering/vtkDataSetToStructuredGridFilter.h
 Filtering/vtkDataSetToStructuredPointsFilter.cxx
 Filtering/vtkDataSetToStructuredPointsFilter.h
 Filtering/vtkDataSetToUnstructuredGridFilter.cxx
 Filtering/vtkDataSetToUnstructuredGridFilter.h
 Filtering/vtkImageMultipleInputFilter.cxx
 Filtering/vtkImageMultipleInputFilter.h
 Filtering/vtkImageMultipleInputOutputFilter.cxx
 Filtering/vtkImageMultipleInputOutputFilter.h
 Filtering/vtkImageSource.cxx Filtering/vtkImageSource.h
 Filtering/vtkImageToImageFilter.cxx Filtering/vtkImageToImageFilter.h
 Filtering/vtkImageTwoInputFilter.cxx
 Filtering/vtkImageTwoInputFilter.h Filtering/vtkPointSetSource.cxx
 Filtering/vtkPointSetSource.h
 Filtering/vtkPointSetToPointSetFilter.cxx
 Filtering/vtkPointSetToPointSetFilter.h
 Filtering/vtkPolyDataSource.cxx Filtering/vtkPolyDataSource.h
 Filtering/vtkPolyDataToPolyDataFilter.cxx
 Filtering/vtkPolyDataToPolyDataFilter.h
 Filtering/vtkProcessObject.cxx Filtering/vtkProcessObject.h
 Filtering/vtkRectilinearGridSource.cxx
 Filtering/vtkRectilinearGridSource.h
 Filtering/vtkRectilinearGridToPolyDataFilter.cxx
 Filtering/vtkRectilinearGridToPolyDataFilter.h
 Filtering/vtkSource.cxx Filtering/vtkSource.h
 Filtering/vtkStructuredGridSource.cxx
 Filtering/vtkStructuredGridSource.h
 Filtering/vtkStructuredGridToPolyDataFilter.cxx
 Filtering/vtkStructuredGridToPolyDataFilter.h
 Filtering/vtkStructuredGridToStructuredGridFilter.cxx
 Filtering/vtkStructuredGridToStructuredGridFilter.h
 Filtering/vtkStructuredPointsSource.cxx
 Filtering/vtkStructuredPointsSource.h
 Filtering/vtkStructuredPointsToPolyDataFilter.cxx
 Filtering/vtkStructuredPointsToPolyDataFilter.h
 Filtering/vtkStructuredPointsToStructuredPointsFilter.cxx
 Filtering/vtkStructuredPointsToStructuredPointsFilter.h
 Filtering/vtkStructuredPointsToUnstructuredGridFilter.cxx
 Filtering//vtkStructuredPointsToUnstructuredGridFilter.h
 Filtering/vtkUnstructuredGridSource.cxx
 Filtering/vtkUnstructuredGridSource.h
 Filtering/vtkUnstructuredGridToPolyDataFilter.cxx
 Filtering/vtkUnstructuredGridToPolyDataFilter.h
 Filtering/vtkUnstructuredGridToUnstructuredGridFilter.h
 Filtering/vtkUnstructuredGridToUnstructuredGridFilter.cxx
 Imaging/vtkImageSpatialFilter.cxx Imaging/vtkImageSpatialFilter.h