[vtkusers] volume rendering fields

[Julien Finet]

Hi Peter,

You can look at vtkUnstructuredGridVolumeRayCastMapper::Render():
For some reason, the following line fails to return a non-empty array for
you.

  this->Scalars = this->GetScalars(this->GetInput(), this->ScalarMode,
                                   this->ArrayAccessMode,
                                   this->ArrayId, this->ArrayName,
                                   this->CellScalars);

You might want to play with vtkAbstractVolumeMapper::SelectScalarArray() to
give the field array you want to render.

Hth,
Julien.

On Wed, Sep 14, 2011 at 8:49 AM, peterm <madapeti at gmail.com> wrote:

> Dear all,
>
> I have a vtkUnstructuredGrid with 2 fields in it. I would like to run a
> vtkUnstructuredGridVolumeRayCastMapper to create volume renderings however
> I
> get an error message "Can't use the ray cast mapper without scalars!" when
> calling the Render() function.
>
> My question is in what way I have to transform the vtkUnstructuredGrid so
> that the scalar fields are transformed to the appropriate format used by
> vtkUnstructuredGridVolumeRayCastMapper?
>
> Thanks,
> Peter
>
>
>
>
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