[vtkusers] Fwd: Origin not passed to vtkExtractVOI through Pipeline (bug?)

[David E DeMarle]

On 11/13/08, Paul <massivemonkeymayhem at gmail.com> wrote:
> Information does not appear to be getting properly passed through from
> the parent data set to a vtkExtractVOI object (particularly, the
> object's origin). It was fine in 5.0 but broke in 5.2. I'll let the
> short code snippet do the talking. Has this perhaps been fixed in CVS?
>
> ---------------------------
>
> import vtk
>
> data = vtk.vtkFloatArray()
>
> for i in range(9):
>   data.InsertNextValue(i)
>
> image = vtk.vtkImageData()
>
> image.GetPointData().SetScalars(data)
> image.SetOrigin(1,1,1)
> image.Update()
>
> roi = vtk.vtkExtractVOI()
> roi.SetInput(image)
> roi.Update()
> roi.GetOutput().GetOrigin()
>
> >>> Out: (1.0, 1.0, 1.0)
>
> # Everything is copacetic
>
> reader = vtk.vtkXMLImageDataReader()
> reader.SetFileName('/path/to/some/file.vti')
>
> reader.Update()
> reader.GetOutput().GetOrigin()
>
> >>> Out: (0.0, 0.0, 9.0)
>
> roi2 = vtk.vtkExtractVOI()
> roi2.SetInputConnection(reader.GetOutputPort())
> roi2.Update()
> roi2.UpdateWholeExtent()
> roi2.GetOutput().GetOrigin()
>
> >>> Out: (0.0, 0.0, 0.0)
>
> # Should be (0.0, 0.0, 9.0) !
> # That makes me a saaaaad panda :(
>
> # NB: roi2.GetOutput().GetSpacing() is just fine.
>
> ---------------------------
>
> The really screwball thing is that I can't even set the Origin
> manually. When I call Render() on the render window, the Origin value
> for roi2 reverts back to (0.0, 0.0, 0.0).
>
>
> Paul
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Hi Paul,

Would you mind reverting VTK/Imaging/vtkExtractVOI.cxx to revision
1.46, trying your code, and letting us know the result? I suspect rev
1.47 broke it.

thanks,

-- 
David E DeMarle
Kitware, Inc.
R&D Engineer
28 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-371-3971 x109