[Paraview] Disappearing volume rendering?

[Aashish Chaudhary]

I believe that is correct.  Run the Tetrahedralize filter and see if that
works.

- Aashish

On Mon, Oct 13, 2014 at 11:36 AM, Cory Quammen <cory.quammen at kitware.com>
wrote:

> Bertwim,
>
> I'm not sure that the volume renderer can handle VTK_HEXAHEDRON
> elements. Try the "Tetrahedralize" filter on your source and see if
> the Volume representation works.
>
> Thanks,
> Cory
>
> On Mon, Oct 13, 2014 at 10:19 AM, B.W.H. van Beest <bwvb at xs4all.nl> wrote:
> > Hi,
> >
> > I'm struggling to get a proper 3D view of my model system (yes,
> > embarrassing!)
> > but must admit my defeat.
> > After stripping almost everything, keeping the minimum to exhibit the
> > issue,
> > I'm left with the following:
> >
> > I have created a simple box source. To get a 3D representation, I
> > sub-classed
> > the code for this Source from vtkUnstructuredGridAlgorithm.
> >
> > In the RequestData method, I define the 8 point of the unit cube. I
> > added the points to the
> > underlying unstructed grid, and I specified the cell topology.
> >
> > This all seems to work: when instantiating this box Source, I *do* get
> the
> > expected cube in the representations (Surface, wireframe, Points).
> >
> > However, when I select the "Volume" representation, *the image
> disappears*
> > What am I doing wrong?
> >
> > As the code is not too long and very simple, I take the freedom to paste
> > it below.
> >
> > Kind regards.
> > Bertwim
> >
> > =========================================
> >
> >  int sphBoxSourceC::RequestData( vtkInformation *vtkNotUsed(request),
> >                                 vtkInformationVector
> > **vtkNotUsed(inputVector),
> >                                 vtkInformationVector *outputVector)
> > {
> >    // Get the info object
> >    vtkInformation *outInfo = outputVector->GetInformationObject(0);
> >    vtkUnstructuredGrid *umesh = vtkUnstructuredGrid::SafeDownCast(
> > outInfo->Get( vtkDataObject::DATA_OBJECT() ) );
> >
> >    // Pre-allocate some memory
> >    umesh->Allocate( 1024 );
> >
> >    // Specify points.
> >    double r0[] = { 0.0, 0.0, 0.0 };
> >    double r1[] = { 1.0, 0.0, 0.0 };
> >    double r2[] = { 0.0, 1.0, 0.0 };
> >    double r3[] = { 1.0, 1.0, 0.0 };
> >    double r4[] = { 0.0, 0.0, 1.0 };
> >    double r5[] = { 1.0, 0.0, 1.0 };
> >    double r6[] = { 0.0, 1.0, 1.0 };
> >    double r7[] = { 1.0, 1.0, 1.0 };
> >
> >    // Collect the points in a vtk data structures.
> >    {
> >       vtkSmartPointer<vtkPoints> points =
> vtkSmartPointer<vtkPoints>::New();
> >       points->SetDataType( VTK_DOUBLE );
> >
> >       points->InsertNextPoint( r0 );
> >       points->InsertNextPoint( r1 );
> >       points->InsertNextPoint( r2 );
> >       points->InsertNextPoint( r3 );
> >       points->InsertNextPoint( r4 );
> >       points->InsertNextPoint( r5 );
> >       points->InsertNextPoint( r6 );
> >       points->InsertNextPoint( r7 );
> >
> >       // Transfer points to umesh.
> >       umesh->SetPoints( points );
> >    }
> >
> >    // Cell Topology
> >    vtkIdType vtx[8] = { 0, 1, 3, 2, 4, 5, 7, 6 };
> >    umesh->InsertNextCell( VTK_HEXAHEDRON, 8, vtx );
> >
> >    return 1;
> > }
> >
> >
> >
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-- 



*| Aashish Chaudhary | Technical Leader         | Kitware Inc.            *
*| http://www.kitware.com/company/team/chaudhary.html
<http://www.kitware.com/company/team/chaudhary.html>*
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