[vtkusers] vtkSubPixelPositionEdgels seg fault

[Mathieu Malaterre]

Hi all,
   I tried vtkSubPixelPositionEdgels on a volume image and I get a seg
fault. I look into the code and I found that the Move method (line 107)
is called on real points (origin and spacing are taken into account).
But these coordinate also serve to access the pixel value in memory
(lines 256 through 292)!  Why do you need to use origin and spacing ?
They are totally outside of memory allocation.

Mathieu
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