Yes, I do set a scalar for each cell. I left them out in the example, as also with a scalar I couldn't get a volume display.
I'm not sure what you mean by "adjusting the transfer function". Regards, Bertwim On 10/13/2014 07:28 PM, Burlen Loring wrote: > do you have any scalars? those are not optional for volume rendering. > Additionally you may need to adjust the transfer function, > > On 10/13/2014 10:22 AM, B.W.H. van Beest wrote: >> No, it doesn't work. The filter creates tets, which are visible in the >> wireframe representation, >> but when I select "Volume" representation the image disappears. >> >> I can't imagine it is so difficult to render a volume in Paraview. I >> must be doing something wrong.... >> >> Regards, >> Bertwim >> >> On 10/13/2014 05:36 PM, Cory Quammen 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 <b...@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; >>>> } >>>> >>>> >>>> >>>> _______________________________________________ >>>> Powered by www.kitware.com >>>> >>>> Visit other Kitware open-source projects at >>>> http://www.kitware.com/opensource/opensource.html >>>> >>>> Please keep messages on-topic and check the ParaView Wiki at: >>>> http://paraview.org/Wiki/ParaView >>>> >>>> Follow this link to subscribe/unsubscribe: >>>> http://public.kitware.com/mailman/listinfo/paraview >> _______________________________________________ >> Powered by www.kitware.com >> >> Visit other Kitware open-source projects at >> http://www.kitware.com/opensource/opensource.html >> >> Please keep messages on-topic and check the ParaView Wiki at: >> http://paraview.org/Wiki/ParaView >> >> Follow this link to subscribe/unsubscribe: >> http://public.kitware.com/mailman/listinfo/paraview > > > _______________________________________________ Powered by www.kitware.com Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Please keep messages on-topic and check the ParaView Wiki at: http://paraview.org/Wiki/ParaView Follow this link to subscribe/unsubscribe: http://public.kitware.com/mailman/listinfo/paraview