Interpolation in vtkPolyData

[A.M_Shahpouri]

Hi everyone .
I want to create an polydata like this

---

I created this Polydata

by this code :

auto appendPolyData = vtkSmartPointer<vtkAppendPolyData>::New();

for (const auto& slice : contour.Slices) {
    auto points = vtkSmartPointer<vtkPoints>::New();

    // Add points to vtkPoints
    for (const auto& point : slice.Points) {
        points->InsertNextPoint(point.X, point.Y, point.Z);
    }

    // Create a vtkPolyLine
    auto polyLine = vtkSmartPointer<vtkPolyLine>::New();
    polyLine->GetPointIds()->SetNumberOfIds(points->GetNumberOfPoints());
    for (vtkIdType i = 0; i < points->GetNumberOfPoints(); i++) {
        polyLine->GetPointIds()->SetId(i, i);
    }

    // Create a vtkCellArray to hold the polyline
    auto cellArray = vtkSmartPointer<vtkCellArray>::New();
    cellArray->InsertNextCell(polyLine);

    // Create vtkPolyData to hold the geometry and topology
    auto polyData = vtkSmartPointer<vtkPolyData>::New();
    polyData->SetPoints(points);
    polyData->SetLines(cellArray);

    // Add the polyData to the append filter
    appendPolyData->AddInputData(polyData);
}

appendPolyData->Update();

// Map the polyData to graphical primitives
auto mapper = vtkSmartPointer<vtkPolyDataMapper>::New();
mapper->SetInputData(appendPolyData->GetOutput());

// Create an actor
auto actor = vtkSmartPointer<vtkActor>::New();
actor->SetMapper(mapper);
actor->GetProperty()->SetColor(0, 0, 1); // Set actor color to blue

// Create a renderer and add the actor
auto renderer = vtkSmartPointer<vtkRenderer>::New();
renderer->AddActor(actor);

// Create a render window
auto renderWindow = vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->AddRenderer(renderer);

// Create an interactor
auto interactor = vtkSmartPointer<vtkRenderWindowInteractor>::New();
interactor->SetRenderWindow(renderWindow);

// Render and start interaction
renderWindow->Render();
interactor->Start();

renderer->ResetCamera();

but between lines of slices are empty .

I tried vtkDelaunay3D but :

I also tried vtkDelaunay2D

But as you can see this need interpolation .

How Can do that?