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

[David E DeMarle]

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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