[vtkusers] Strange behavior of vtkImageAlgorithm subclass - empty output

[Bill Lorensen]

By design, I don't think the ShallowCopy copies the extents. Extents
belonog to the pipeline and not the data object.

Try
output->SetExtent(grid->GetExtent());
output->SetUpdateExtent(grid->GetUpdateExtent());
output->SetWholeExtent(grid->GetWholeExtent());



On Sat, Jan 30, 2010 at 9:01 AM, David Doria <daviddoria+vtk at gmail.com> wrote:
> On Fri, Jan 29, 2010 at 11:38 PM, Bill Lorensen <bill.lorensen at gmail.com> wrote:
>> What results from:
>> output->Print(std::cout);
>
> 1)
> Is there a difference between
> cout << *output;
> and
> output->Print(std::cout);
> ?
>
> 2)
> I compared the output of 'grid' and 'output' (both inside
> RequestData). Here are the differences:
>
> grid:
>  UpdateExtent: 0, 10, 0, 10, 0, 10
>  WholeExtent: 0, 10, 0, 10, 0, 10
>
> output:
>  UpdateExtent: 0, -1, 0, -1, 0, -1
>  WholeExtent: 0, -1, 0, -1, 0, -1
>
>  MaximumNumberOfPieces: -1
>
> Number of Points and Number Of Cells are correct in both. Everything
> else is the same.
>
> Thanks,
>
> David
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