[vtkusers] help filtering using c++

[Alberto Bert]

Ops, solved. The problem was that you have to get the ImageData through
GetOutput.

Alberto

On Thu, Aug 22, 2002 at 01:35:44PM +0200, Alberto Bert wrote:
> Hi all,
> 
> I'm starting to practice a little with vtk (2 days) and this is the
> first message to the list.
> 
> I need to work in c++ and unfortunately most of eaxamples are in tcl or
> python only, any suggestions?
> 
> My problem is that I cannot filter a vtkImageData succesfully.
> 
> Without filtering, I can extract a contour from vol and represent it. The filtering (say  vtkImageGaussianSmooth)
> seems to change the nature of the image. I think I forget something but I cannot find examples in c++
> 
> I know that the question probably is stupid, sorry,
> Alberto
> 
> Here is the code:
> 
> //Generation of the 3D vtkImageData vol
> 
> // Gaussian smoothing
>   vtkImageGaussianSmooth *smooth = vtkImageGaussianSmooth::New();
>         smooth->SetInput(vol);
> 
>   vtkContourFilter *contour = vtkContourFilter::New();
>       //contour->SetInput(vol);
>       contour->SetInput(smooth);
>       contour->SetValue(0,0.5);
> 
>   vtkPolyDataMapper *volMapper = vtkPolyDataMapper::New();
>       volMapper->SetInput(contour->GetOutput());
>       volMapper->ScalarVisibilityOff();
>   vtkActor *volActor = vtkActor::New();
>       volActor->SetMapper(volMapper);
> 
>  renderer->AddActor(volActor);
>       renderer->SetBackground(1,1,1);
>   renWin->SetSize(500,500);
>   //// interact with data
>   renWin->Render();
> //
>   iren->Start();
> //
>   // Clean up
>   renderer->Delete();
>   renWin->Delete();
>   iren->Delete();
>   vol->Delete();
>   scalars->Delete();
>   contour->Delete();
>   volMapper->Delete();
>   volActor->Delete();
>   smooth->Delete();
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