[vtkusers] OK so does ANYONE use the vtkImageTracerWidget?

[kent williams]

I think you have to set the drawing plane and the plane normal for the
tracer for it to work the way you want.

I cheated -- I use the vtkViewImage2DWithTracer class from the
vtkinria3d library:

http://www-sop.inria.fr/asclepios/software/vtkINRIA3D/

That does the book-keeping to keep the tracer able to trace.

I'm working on a tracer application that does what you're talking
about but it's not yet ready for prime time.  Pretty soon I'll start a
project

On 11/4/07, Mark Wyszomierski <markww at gmail.com> wrote:
> I had a look at the code I had written, turns out I was kind of
> cheating because I could never get vtkImageTracerWidget to behave the
> way I expected with a 3d image volume.
>
> What I did was made one instance of vtkImageReader2 with a depth of 1
> image. When scrolling to the next image in the image series, I'd
> overwrite all the pixel data. This way the tracer widget was only ever
> present on the only 'image' in the viewer.
>
> I have a test application now which just reads a sequence of images,
> and I cannot get the tracer widget to draw on any other slice besides
> the first one. How are you able to draw on the other slices?
>
> In the old application I have, I am using the following to re-init the handles:
>
>    vtkPoints* p = vtkPoints::New();
>    // Fill 'p' in here with your stored handle points for the current
> image index.
>    m_pTracerWidget->InitializeHandles(p);
>    m_pTracerWidget->Modified();
>    p->Delete();
>
> and that works ok.
>
> I don't know if the single image at a time trick is usable for you
> guys. If you let me know how you were able to draw on multiple slices
> I can patch it in and put up an example,
>
> Thanks,
> Mark
>
> On 11/2/07, jonathan grimm <flymolo at gmail.com> wrote:
> > I will be doing most of the same things you talked about, but I haven't
> > gotten into it yet.  As a general course when I want to greatly extend
> > something from VTK, I edit the existing class making everything non-trivial
> > virtual then extend the class.  This allows me to keep up to date with VTK
> > fairly easily.  I haven't looked at image tracer widget yet though.  The
> > application I need it for will be my first Qt application, and I'm trying to
> > design the event model first.
> >
> > The application this program is replacing strictly marked points, leaving
> > the construction of lines and surfaces to post-processing.  This approach
> > has proved burdensome, and we would like to delineate surfaces (possibly
> > with splines rather than lines) in the future.
> >
> > What is your time frame for this application?  I will probably have our
> > lab's solution in a month or so.
> >
> >
> > On Nov 2, 2007 8:01 AM, kent williams < nkwmailinglists at gmail.com> wrote:
> > > A couple of days ago, I posted a note asking about image tracing using
> > > vtkImageTracerWidget.  I guess it was too long or too speculative or
> > > something because I got no response.
> > >
> > > I'm not complaining, mind you.  I know support from peers and
> > > developers is voluntary.
> > >
> > > But since it didn't get any response let me ask a different question:
> > > Has anyone use the vtkImageTracerWidget for any real application?
> > >
> > > If the answer is no, what did you end up doing to implement tracing?
> > >
> > > Right now, I've gotten as far as this:
> > >
> > > 1. Load a 3D Image.
> > > 2. Enable tracing. Trace on that slice
> > > 3. When I switch slices, save the traced points
> > > 4. When I switch back to a slice I've already traced, restore the saved
> > points.
> > >
> > > What isn't happening right now: If I switch to an untraced slice, I
> > > call InitializeHandles() with a zero length set of points, but this
> > > doesn't in fact get rid of the currently visualized trace.
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> >
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