[vtkusers] Source derived from vtkAlgorithm

[David E DeMarle]

RequestDataObject (RDO) is an earlier pipeline pass.
During RDO, each filter is supposed to produce an empty data object of
the proper type

Later on RequestData (RD) happens.
During RD each filter examines any inputs it has, then fills in that
empty data object with real data.

The VTK User's guide goes into more detail. Issue 1 of the Kitware
source also describes the pipeline execution model.

David E DeMarle
Kitware, Inc.
R&D Engineer
28 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-371-3971 x109



On Mon, Nov 30, 2009 at 4:34 PM, David Doria <daviddoria+vtk at gmail.com> wrote:
> On Mon, Nov 30, 2009 at 9:24 AM, Jeff Baumes <jeff.baumes at kitware.com> wrote:
>>> I spent quite a while paring some of those down and combining them trying to
>>> get the desired functionality. However, I'm still having some issues. The
>>> pipeline code gets pretty complex in a big hurry.
>>
>> You may want to look at this special-purpose data object. Note that
>> your new type must inherit from vtkDataObject or subclass.
>>
>> Rendering/vtkLabelHierarchy (new data object subclass)
>> Rendering/vtkLabelHierarchyAlgorithm (new superclass for algorithms)
>> Rendering/vtkPointSetToLabelHierarchy (algorithm that produces
>> vtkLabelHierarchy)
>>
>> Jeff
>>
>
> Great - I got them working:
> http://www.vtk.org/Wiki/VTK_Examples_vtkAlgorithm_Source
> http://www.vtk.org/Wiki/VTK_Examples_vtkAlgorithm_Filter
>
> What is the difference between RequestDataObject() and RequestData()?
>
> Thanks,
>
> David
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