[vtk-developers] Fwd: vtkUnstructuredGridVolumeRayCastMapper (05B22CB8): Can't use the ray cast mapper without scalars!

[David E DeMarle]

Try changing it to SetScalarModeToUsePointData()

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



On Wed, Oct 7, 2009 at 3:28 PM, Ali Habib <ali.mahmoud.habib at gmail.com> wrote:
> Dear David
>
> even with comment this line
> volumeUnstructedMapper->SetScalarModeToUseCellData();  the same error appear
>
> what shall I do
>
> On Wed, Oct 7, 2009 at 9:22 PM, David E DeMarle <dave.demarle at kitware.com>
> wrote:
>>
>> You are making scalars here, and associating them with the POINTS of
>> the unstructuredgrid.
>>
>> > unstructuredReader->GetOutput()
>> ->GetPointData()->AddArray(arr);
>> > unstructuredReader->GetOutput()
>> ->GetPointData()->SetActiveScalars("myarray");
>>
>> Later, you are telling the volume renderer to use CELL associated scalar
>> data.
>> > volumeUnstructedMapper->SetScalarModeToUseCellData();
>>
>> David E DeMarle
>> Kitware, Inc.
>> R&D Engineer
>> 28 Corporate Drive
>> Clifton Park, NY 12065-8662
>> Phone: 518-371-3971 x109
>>
>>
>>
>> On Wed, Oct 7, 2009 at 3:15 PM, Ali Habib <ali.mahmoud.habib at gmail.com>
>> wrote:
>> > Dear All
>> >
>> > I know it's for developing just , but I sent 6 times to vtk user forum
>> > , with no reply helped me , so I am not sure is this bug or not
>> >
>> > best regards
>> >
>> > ---------- Forwarded message ----------
>> > From: Ali Habib <ali.mahmoud.habib at gmail.com>
>> > Date: Tue, Sep 29, 2009 at 9:47 PM
>> > Subject: vtkUnstructuredGridVolumeRayCastMapper (05B22CB8): Can't use
>> > the
>> > ray cast mapper without scalars!
>> > To: vtkusers at vtk.org
>> >
>> >
>> > I wrote a code to make tetrahedral mesh on sphere , but it no give
>> > result
>> > except :
>> >
>> > ERROR: In
>> >
>> > m:\dev\cur\vtkdotnet\branch\50\VolumeRendering\vtkUnstructuredGridVolumeRayCastMapper.cxx,
>> > line 274
>> > vtkUnstructuredGridVolumeRayCastMapper (05B22CB8): Can't use the ray
>> > cast
>> > mapper without scalars!
>> >
>> > every time I  run the code
>> >
>> > attached is the c++ code , your fast reply is highly appretiated
>> >
>> >
>> > best regards
>> >
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>
>