[vtkusers] pixel data at world position

[Mark Wyszomierski]

You can fire a pick event when the user clicks the mouse:
  Picker->Pick(eventpos[0], eventpos[1], 0, renderer);
 Then you can get the mapped position:
  Picker->GetMapperPosition(...);
 Then the final x,y locs of the original image I get by:
  originalX = (int)(ptMapped[0] / pixel_spacing_x + 0.5);
 // same for y.
 This always has given me the correct 'real' location.
 Mark

 On 10/5/05, Renaud Isabelle <renauisa at yahoo.fr> wrote:
>
> Hi all,
>  I have read an initial 3D image from a file with itkImageFileReader and
> displayed with VTK through vtkImageData/vtkImageActor.
>  Now, since a known world position in 3D x,y,z, I would like to retrieve
> the pixel value at this point of my image.
>  This seems to be a complex problem, because I don't want the pixel data
> that is displayed at this position but the pixel data of the raw image, that
> is no rescaled instead.
>  Is there some example where such a thing is done? Or any function?
>  Thanks,
>  Isabelle
>
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