[vtkusers] Ordering wrong when convert vtkImageData to vtkPolyData

[Summer Sun]

Thank you so much David,

I have tried your method but the result I use vtkStripper is exactly the
*same*... 
I saw the vtk documents below that might be help but I don't quite get it:
---
*Warning*
If triangle strips or poly-lines exist in the input data they *will be
passed through to the output data*. This filter will only construct triangle
strips if triangle polygons are available; and will only construct
poly-lines if lines are available.
---

*Here's my related code:*
...
/// 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();

/// draw the contour/
contourWidget->Initialize(segPolyStripper->GetOutput());
...

Thanks for your help
Summer



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