View source for VTK/VTK 6 Migration/Removal of SetWholeExtent

= Removal of SetWholeExtent() from vtkDataObject =

VTK 6 introduces a number of backwards-incompatible changes. The reasons behind these changes are described in more detail [[VTK/VTK_6_Migration/Overview | here]]. One of these changes is the removal of all pipeline related methods from vtkDataObject. Among these methods is SetWholeExtent(). SetWholeExtent() was previously (correctly) used to set meta-data about the whole available extent of a structured dataset in RequestInformation() and (incorrectly) used to try to set the actual extent of a structured dataset. The first use case can be replaced with the setting of the WHOLE_EXTENT() in the output information and the second one can be safely removed.

== Example 1 ==

Replace

<source lang="cpp">
int vtkMyReader::RequestInformation(vtkInformation*, vtkInformationVector**, 
       vtkInformationVector* outInfoVec)
{
   vtkImageData* image = this->GetOutput();
   int wext[6] = {0, 10, 0, 10, 0, 10};
   image->SetWholeExtent(wext);
   return 1;
}
</source>

with

<source lang="cpp">
int vtkMyReader::RequestInformation(vtkInformation*, vtkInformationVector**, 
       vtkInformationVector* outInfoVec)
{
   vtkInformation* outInfo = outInfoVec->GetInformationObject(0);
   int wext[6] = {0, 10, 0, 10, 0, 10};
   outInfo->Set(vtkStreamingDemandDrivenPipeline::WHOLE_EXTENT(), wext, 6);
   return 1;
}
</source>

== Example 2 ==

If outside RequestInformation, replace

<source lang="cpp">
int wext[6] = {0, 10, 0, 10, 0, 10};
image->SetExtent(wext);
image->SetWholeExtent(wext);
</source>

with

<source lang="cpp">
int wext[6] = {0, 10, 0, 10, 0, 10};
image->SetExtent(wext);
</source>