[vtkusers] vtkCutter using vtkPolyPlane extends beyond polyline's endpoints

[Luca Pallozzi Lavorante]

Hi Marco, did you experience the same problem that I reported?
 I mean, the cuts extending beyond the endpoints of the polyline used to
feed vtkPolyPlane?

I think that maybe the problem could be solved composing vtkPolyPlane with
two more planes normal to each polylne's endpoints. I also think that this
could be done using something like vtkImplicitBoolean, but I don't know
how. It is not clear to me how instances of vtkImplicitFunction should be
composed in order to remove the planes past the polyline's endpoints. I
also noticed that this "extensions" are not planar: beyond the polyline's
endpoints the planes form "waves" when looked down along the Z axis. I also
noticed this behaviour by modifying the
Interaction/Widgets/Testing/Cxx/TestPolyPlane.cxx example, where I
explicitly created and visualized a vtkPolyData from vtkCutter's output (In
this example, vtkCutter received as implicit function an instance of
vtkPolyPlane, just as I needed).

 Any kind help or explanation on this issue would be greatly welcomed.

     Thank you

         Luca

On Thu, Jun 22, 2017 at 6:12 PM, Luca Pallozzi Lavorante <
lplavorante at gmail.com> wrote:

> Hi vtkusers,
>
> I have a vtkUnstruturedGrid showing depositional data and I'd like to cut
> this data using contiguous vertical slices defined by a vtkPolyLine. I have
> seen in the documentation that vtkPolyPlane generates the right implicit
> function which I can pass to vtkCutter.
> The resulting cuts are OK, but my vertical slices extends beyond my
> polyline's endpoints. I would like to end the cutting planes exaclty at my
> polyline's first and last point. Is this possible?
> I am using VTK 7.0 on Linux.
>
>   Thank you very much for any help
>
>                 Luca
>
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