[vtkusers] Storing an independent piece of information in a VTP file

[David E DeMarle]

To store it in the FieldData, yes. And that is the approach I recommend.

An alternative approach is to store the information in the dataset's
vtkInformation structure.

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



On Fri, Apr 17, 2009 at 2:11 PM, David Doria <daviddoria at gmail.com> wrote:
> It looks like even if I want to store only a single number I need to use a
> vtkIntArray, like this?
>
>   vtkIntArray *intArray = vtkIntArray::New();
>   intArray->SetNumberOfComponents(1);
>   intArray->InsertNextValue(4);
>   intArray->SetName("FileIndex");
>  pdata->GetFieldData->AddArray(intArray);
>
> Thanks,
>
> David
>
>
> On Fri, Apr 17, 2009 at 1:44 PM, David E DeMarle <dave.demarle at kitware.com>
> wrote:
>>
>> Yes. That is what the field data is for.
>>
>> All DataSets have three independent containers for arrays.
>>
>> ds->GetPointData() returns the container that holds point associated
>> values.
>> ds->GetCellData() returns the container that holds cell associated values.
>> ds->GetFieldData() returns the general purpose (whole data set
>> associated) container
>>
>> David E DeMarle
>> Kitware, Inc.
>> R&D Engineer
>> 28 Corporate Drive
>> Clifton Park, NY 12065-8662
>> Phone: 518-371-3971 x109
>>
>>
>>
>> On Fri, Apr 17, 2009 at 1:41 PM, David Doria <daviddoria at gmail.com> wrote:
>> > Say I have a vtp file which contains 100 points (and vertices). I know
>> > how
>> > to add a vector of the same length with information about each point,
>> > but is
>> > there a way to add just a single integer or double or something? For
>> > example, if I want to know this was the 4th file, I would want to store
>> > FileIndex=4 in the file. If I add a vtkIntArray with only one element,
>> > paraview gets mad when I open the file because that array is not the
>> > same
>> > length as the point array.
>> >
>> > This is what I was doing:
>> > vtkSmartPointer<vtkIntArray> FileIndex =
>> > vtkSmartPointer<vtkIntArray>::New();
>> >     FileIndex->SetNumberOfComponents(1);
>> >     FileIndex->SetName("FileIndex");
>> >     FileIndex->InsertNextValue(4);
>> >     pdata->GetPointData()->AddArray(FileIndex);
>> >
>> > What I want to do would be something like this:
>> >     pdata->AddData("FileIndex")->AddValue(4); //this is not valid VTK
>> > syntax
>> >
>> > Is there any way to do this?
>> >
>> > Thanks,
>> >
>> > David
>> >
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>
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