[Paraview-developers] object not displaying in the paraview window

[Chiranjib Sur]

Wow, This works like a magic !

Thank you very much for the solution and sorry for my delay in updating
about the problem I mentioned.

Chiranjib

On Fri, Apr 17, 2015 at 5:54 PM, Utkarsh Ayachit <
utkarsh.ayachit at kitware.com> wrote:

> You're missing a call to `transformModel->Update()` before calling
> `transformModel->GetOutput()`. The filter never updated, and hence its
> output is empty.
>
> Utkarsh
>
> On Fri, Apr 17, 2015 at 6:34 AM, Chiranjib Sur <sur.chiranjib at gmail.com>
> wrote:
> > Hi All,
> > I want to apply the tranform filter while I create an object in
> paraview. TO
> > try with I have overloaded vtkCubeSource class and can create the object
> > which appears in the paraview pipeline and I can visualize the object in
> the
> > PV window.
> >
> > Now I want to apply the transformation filter (vtkTransform) to the objct
> > when I create it. To do that I have overloaded the RequestData function
> like
> > the following.
> >
> > The code is compiling and executing but when I create the object and
> apply
> > transform, nothing is appearing in the PV visualization window.
> >
> > Can anybody help me pointing out what is going wrong with my
> implementation.
> >
> > I cam copying my code below
> >
> > Thanks,
> > Chiranjib
> >
> >
> > ------
> >
> >
> >
> > int MyOwnCubeSource::RequestData( vtkInformation *vtkNotUsed(request),
> >
> >                      vtkInformationVector **vtkNotUsed(inputVector),
> >
> >                      vtkInformationVector *outputVector)
> >
> > {
> >
> >   // get the info object
> >
> >   vtkInformation *outInfo = outputVector->GetInformationObject(0);
> >
> >
> >
> >   // get the ouptut
> >
> >   vtkPolyData *output = vtkPolyData::SafeDownCast(
> >
> >     outInfo->Get(vtkDataObject::DATA_OBJECT()));
> >
> > ....
> >
> > ....
> >
> >
> >
> > // output (type vtkPolyData) is already ready at this stage
> >
> >
> >
> > // If I don’t appy transform operation afterwards, I can visualize the
> > object in the PV pipeline
> >
> >
> >
> >
> >
> > // -----------------------------------------------//
> >
> >
> >
> > // Implementation of vtkTransform starts here
> >
> >
> >
> >     double _rotationZ = 30.0;
> >
> >
> >
> > // Define transform
> >
> >     vtkSmartPointer<vtkTransform> transform =
> > vtkSmartPointer<vtkTransform>::New();
> >
> >
> >
> >     // Define transformModel : transform filter
> >
> >     vtkSmartPointer<vtkTransformFilter> transformModel =
> > vtkSmartPointer<vtkTransformFilter>::New();
> >
> >     transformModel->SetTransform(transform);
> >
> >
> >
> >     //Decoupling the pipeline and asking the transformfilter to update
> the
> > newpipeline (created out of shallowcopy)
> >
> >     vtkNew<vtkPolyData> cubeCopy;
> >
> >     cubeCopy->ShallowCopy(output);
> >
> >     transformModel->SetInputData(cubeCopy.GetPointer());
> >
> >
> >
> >     // Describe all the transform operations
> >
> >      transform->PostMultiply();
> >
> >      transform->RotateZ(10*_rotationZ);
> >
> >      transform->Update();
> >
> >
> >
> >      // getting the transformed output
> >
> >      vtkSmartPointer<vtkDataSet> transformedOutput =
> > transformModel->GetOutput();
> >
> >
> >
> >      // Shallowcopy the transformed output to the old pipeline
> >
> >
> >
> >     output->ShallowCopy(transformedOutput);
> >
> >
> >
> > // A this stage "output" should be updated and the visualization pipeline
> > should show the transformed object
> >
> >
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