[vtkusers] vtkContourFilter issue

[Bill Lorensen]

Print grid and post the results.

On Wed, Dec 9, 2009 at 10:17 AM, David Doria <daviddoria+vtk at gmail.com> wrote:
> On Wed, Dec 9, 2009 at 10:04 AM, Bill Lorensen <bill.lorensen at gmail.com> wrote:
>> You need to set the value to be extracted by the contour filter. You
>> also need to Update() the contour filter before requesting its output.
>>
>> Or, did you just leave out those in your e-mail?
>
> Francois,
> Good point, that would have been a bug in my algorithm, but it
> shouldn't prevent SOMETHING from happening (i.e. not producing a
> PolyData with 0 points and cells).
>
> Bill,
> Yes, sorry I omitted that part:
>
>    vtkSmartPointer<vtkContourFilter> contourFilter =
>        vtkSmartPointer<vtkContourFilter>::New();
>    contourFilter->SetValue(0, 0); // the 0th contour should be the 0 contour
>    contourFilter->SetInput(grid);
>    contourFilter->Update();
>    vtkPolyData* surface = contourFilter->GetOutput();
>    vtkstd::cout << "Number of points: " <<
> surface->GetNumberOfPoints() << vtkstd::endl;
>    vtkstd::cout << "Number of cells: " << surface->GetNumberOfCells()
> << vtkstd::endl;
>
> Number of points: 0
> Number of cells: 0
>
> I checked that the values of 'd' that are being set in:
> grid->SetScalarComponentFromDouble(x,y,z,0,d);
> are valid and they are.
>
> Any other thoughts?
>
> Thanks,
>
> David
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