[vtkusers] vtkPointInterpolator2D not interpolating

[kenichiro yoshimi]

Hello,

I translated the linked python into C++, however I can't replicate the
issue. Could you confirm the same problem occurs with my attached C++?

Regards

2018-02-25 22:02 GMT+09:00 gde23 <gdeee at web.de>:
> Hello,
>
> i am trying to interpolate the z-value of points which are stored as P(x, y,
> z) values in the format of vtkPolyData using VTK8.1.0 in c++.
>
> Therefore i translated following  example
> <https://www.vtk.org/gitweb?p=VTK.git;a=blob;f=Filters/Points/Testing/Python/TestPointInterpolator2D2.py>
> from pyhton to c++ (i haven't tested it using python)
>
>     vtkNew<vtkDEMReader> demReader;
>     demReader->SetFileName("/home/path/to/data/Data/SainteHelens.dem");
>     demReader->Update();
>
>     double bds[6];
>     demReader->GetOutput()->GetBounds(bds);
>
>     // Create a plane of onto which to map the elevation data
>     vtkNew<vtkPlaneSource> plane;
>     plane->SetResolution(200, 200);
>     plane->SetOrigin(bds[0],bds[2],bds[4]);
>     plane->SetPoint1(bds[1],bds[2],bds[4]);
>     plane->SetPoint2(bds[0],bds[3],bds[4]);
>     plane->Update();
>
>     // # Gaussian
> kernel-------------------------------------------------------
>     vtkNew<vtkGaussianKernel> gaussianKernel;
>     gaussianKernel->SetSharpness(2);
>     gaussianKernel->SetRadius(200);
>
>     vtkNew<vtkPointInterpolator2D> interp;
>     interp->SetInputConnection(plane->GetOutputPort());
>     interp->SetSourceConnection(demReader->GetOutputPort());
>     interp->SetKernel(gaussianKernel);
>     interp->SetNullPointsStrategyToClosestPoint();
>     interp->InterpolateZOff();
>     interp->Update();
>
>     vtkSmartPointer<vtkPolyData> interpolated_poly_data =
> interp->GetPolyDataOutput();
>
> after that i visualize the interpolated_poly_data with the same pipeline i
> use to plot other stuff.
>
> However the output of the vtkPointInterpolator2D is always the same as what
> was set in SetInputConnection() or SetInputData() (in this example just a
> plane)
> The SetSourceConnection() / SetSourceData() that should be interpolated
> doesn't have any effect on the output at all.
>
> I also have played around with different types of kernels as well as
> different settings for
> NullPointsStrategy and InterpolateZ off/on.
>
> What am i missing or where is the error?
>
>
>
>
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