[Insight-users] Re: [vtkusers] pixel data at world position

[Diego Parada]

Hi,

I'm trying the same thing, but my question are when i can capture the
coordinate

2005/10/5, Mark Wyszomierski <markww at gmail.com>:
>
> 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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--
Diego Armando Parada Cuervo
Estudiante de Ingeniería de Sistemas y Computación
Universidad Pedagógica y Tecnológica de Colombia
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