[vtkusers] AddArray() to polydata

[David E DeMarle]

On Tue, Sep 28, 2010 at 8:39 PM, ChiaWeng Boon <chiaweng at gmail.com> wrote:
> Hi,
>
> My AddArray() to this polydata does not work.  I tried also
> GetCellData()->SetScalars(speed).  The array/variable speed is not
> present!  Can someone tell me why?
>
>                 /* vtksamplefunction before this */
>                 vtkContourFilter *contours = vtkContourFilter::New();
>                 contours->SetInput(sample->GetOutput());
>                 contours->GenerateValues(1,-0.01, 0.01);
>                vtkSmartPointer<vtkPolyData> polydata =
> vtkSmartPointer<vtkPolyData>::New();
>                polydata = contours->GetOutput();
>                vtkSmartPointer<vtkUnsignedCharArray> speed =
> vtkSmartPointer<vtkUnsignedCharArray>::New();
>                speed->SetName("pbColors");
>                vtkIdType nbCells=polydata->GetNumberOfPoints();
>                for (int i=0;i<nbCells;i++){
>                        speed->InsertNextValue(2);
>                }
>                polydata->GetPointData()->AddArray(speed);    // HELP HELP

It suspect polydata contains the array at this point in time.

>                polydata->Update();

I suspect this call causes contour to update, replaces the contents of
polydata with new information, and getting rid of your array when it
does so.

>
> Yours,
> boon
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