[vtkusers] 3D regular scalar field visualisation

[Artem Babayan]

Thank you for your reply.

> You need to set a desirable transfer function. Fire up your data in VolView
> (or in Paraview). Play around with the transfer function editor.

I have tried the data with Paraview already -- that is how I know what
I would like to get in the end. In 'Display' tab I set representation
to 'Volume' and mapper as 'Fixed point'. What is the transfer function
editor? Is it the same as 'Color scale editor' which appears when
pressing the 'Edit color map' button?

Artem

>
> --
> karthik
>
> On Fri, Apr 30, 2010 at 1:02 PM, Artem Babayan
> <artem.paraview at googlemail.com> wrote:
>>
>> Hello,
>>
>> I am trying to visualize 3D scalar field defined on regular grid (i.e.
>> STRUCTURED_POINTS dataset). What I would like to get is a
>> semitransparent colored cloud. So far I did the following: read the
>> data -> pass them to vtkFixedPointVolumeRayCastMapper -> pass it to
>> actor -> pass it to renderer -> pass it to windows:
>>
>>      //read the volume from file
>>      vtkSmartPointer<vtkStructuredPointsReader> reader_conc=
>>                      vtkSmartPointer<vtkStructuredPointsReader>::New();
>>      reader_conc->SetFileName("conc_3d.vtk");
>>
>>      //Create a mapper
>>      vtkSmartPointer<vtkFixedPointVolumeRayCastMapper> mapper_conc =
>>
>> vtkSmartPointer<vtkFixedPointVolumeRayCastMapper>::New();
>>      mapper_conc->SetInput(reader_conc->GetOutput());
>>
>>      //Create an actor
>>      vtkSmartPointer<vtkVolume> actor_conc =
>>                              vtkSmartPointer<vtkVolume>::New();
>>      actor_conc->SetMapper(mapper_conc);
>>
>>      // Create a rendered
>>      vtkSmartPointer<vtkRenderer> renderer =
>>                              vtkSmartPointer<vtkRenderer>::New();
>>      renderer->AddActor(actor_conc);
>>
>>     <Add renderer to the window etc.>
>>
>> But the results are not satisfactory -- all it shows is strange black
>> and white image. I guess, it is necessary to set some parameters for
>> the mapper? Which ones?
>>
>> Best wishes
>> Artem
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