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

[Chiranjib Sur]

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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