[vtkusers] Ordering wrong when convert vtkImageData to vtkPolyData

[David Gobbi]

Hi Summer,

For the contour widget, you will probably have to create a new vtkPoints
object where the points have the ordering specified by the the cell array
returned by stripper->GetLines().  The vtkStripper doesn't put the points
in order, it just provides a cell array that specifies how to put the
points in order.

 - David

On Fri, Mar 17, 2017 at 12:48 AM, Summer Sun <sunxiasx at foxmail.com> wrote:

> Thank you David,
> But I use code below, the render result still doesn't change.
>
> ...
> // get marching squares of image data
> vtkSmartPointer<vtkMarchingSquares> segContour =
> vtkSmartPointer<vtkMarchingSquares>::New();
> segContour->SetInputData(segmentation); // segmentation is my image data
> segContour->SetValue(0, 255);
> segContour->Update();
>
> // use vtkStripper to process marching squares data
> vtkSmartPointer<vtkStripper> segPolyStripper =
> vtkSmartPointer<vtkStripper>::New();
> segPolyStripper->SetInputData(segContour->GetOutput());
> segPolyStripper->Update();
>
> *// set points and lines according to stripper output*
> vtkSmartPointer<vtkPolyData> segPoly = vtkSmartPointer<vtkPolyData>::
> New();
> segPoly->SetPoints(segContour->GetOutput()->GetPoints());
> segPoly->SetLines(segPolyStripper->GetOutput()->GetLines());
>
> // draw the contour
> contourWidget->Initialize(segPoly);
> ...
>
>
>
> --
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> com/Ordering-wrong-when-convert-vtkImageData-to-
> vtkPolyData-tp5742492p5742504.html
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