[vtkusers] [Fwd: Selecting points on image slices]

[Joël Schaerer]

On Mon, 2006-08-07 at 18:11 -0300, Wagner Sales wrote:
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> Hi Joël,
> 
> You was tried with vtkCellPicker? Are used in vtkImagePlaneWidget to
> get scalar value.
> Well, I was posted a question on this list ( in attachment ) that's
> you may be can help me. After I solve this problem, I'll needs to
> perform the same task you needs now. I think maybe we can solve the
> problem together ( ;) ) and put the solution at the list.

Sure, that would be nice :) Although i'm not sure we're trying to solve
the same problem? 
Concerning my problem, I just tried vtkCellPicker, but as expected, it
gives the same results as vtkPointPicker. I think the problem comes from
the fact that I use vtkImageActor to slice the data, thus the dataset is
still the full volume. I will try adding a vtkImageClip in the pipeline
to try to circumvent the problem.

joel


> 
> Thks
> 
> Wagner Sales
> Joël Schaerer wrote:
> > == It seems my message did not get posted to the list. I'm posting
> > it again ==
> >
> >> Hello all,
> >>
> >> I am trying to put together a basic interface to select points in
> >> an image volume. The volume is displayed using vtkImageActor, one
> >> slice at a time. The slice plane is normal to the z axis. To find
> >> the coordinates of the point on the image, I use a picker. The
> >> problem is, no matter what picker I use (vtkWorldPointPicker,
> >> vtkPointPicker), the z coordinate is always wrong. vtkPointPicker
> >> always returns the z of the base slice no matter what slice I am
> >> displaying. vtkWorldPointPicker returns a somewhat random z,
> >> depending on image zoom and camera orientation.
> >>
> >> Am I on the right track? Is there a better solution to this
> >> problem? Is this a bug?
> >>
> >> many thanks,
> >>
> >> joel
> >
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> 
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> email message attachment (Attached Message)
> > -------- Forwarded Message --------
> > From: Wagner Sales <wsalles2003 at yahoo.com.br>
> > To: vtkusers at vtk.org
> > Subject: How are the correct aproach to construct a simple slicer?
> > Date: Mon, 07 Aug 2006 18:02:56 -0300
> >