[vtkusers] Gouraud shading of a vtkStructuredGrid's boundary

[Luca Pallozzi Lavorante]

Hi Cory, thank you for the quick reply.
I have tried setting the whole extent of the grid in the
vtkStructuredGridGeometryFIlter and obtained only the grid's points as
before.
Then I used vtkDataSetGeometryFilter and it worked. It even copied nicely
the cell data I had in the original grid.
I think this solved the problem.

  Thank you once again,

          Luca


On Wed, Aug 10, 2016 at 2:56 PM, Cory Quammen <cory.quammen at kitware.com>
wrote:

> Two things to try: 1) set the extent to the whole extent of your grid,
> or 2) try using vtkDataSetSurfaceFilter instead of
> vtkStructuredGridGeometryFilter.
>
> Cory
>
> On Wed, Aug 10, 2016 at 1:51 PM, Luca Pallozzi Lavorante
> <lplavorante at gmail.com> wrote:
> > Sorry Cory, I was mistaken and way too quick in replying. When I wrote
> the
> > last mail I was still observing the output from the six combined
> > vtkStructuredGridGeometryFilter's. Now I have tried one single filter
> > without providing any SetExtent call and the result I have is the
> > visualization of the StructuredGrid's points. No Boundary. How can I
> > instruct the filter to generate the Boundaries?
> >
> > Thank you
> >
> >    Luca
> >
> > On Wed, Aug 10, 2016 at 2:44 PM, Luca Pallozzi Lavorante
> > <lplavorante at gmail.com> wrote:
> >>
> >> Hi Cory, thank you for your reply.
> >>
> >> You are absolutely right! I have followed  your adviced and removed the
> >> SetExtent() call to vtkStructuredGridGeometryFIlter (I had previously
> used
> >> six of them to get the all the boundaries and then merged them with
> >> vtkAppendPolyData) and I have magically obtained the complete boundary
> as
> >> output with a single filter.
> >> It worked really fine.
> >> Thank you for your kind help!
> >>
> >> Best regards,
> >>
> >>    Luca
> >>
> >>
> >> On Wed, Aug 10, 2016 at 2:07 PM, Cory Quammen <cory.quammen at kitware.com
> >
> >> wrote:
> >>>
> >>> Luca,
> >>>
> >>> You are on the right track. vtkStructuredGridGeometryFilter should
> >>> extract just one polydata defining all the boundaries of your
> structured
> >>> grid. In the end, your pipeline should look like
> >>>
> >>> vtkStructuredGrid -> vtkStructuredGridGeometryFilter ->
> >>> vtkPolyDataNormals -> vtkDataSetMapper -> vtkActor
> >>>
> >>> HTH,
> >>> Cory
> >>>
> >>> On Wed, Aug 10, 2016 at 12:08 PM, Luca Pallozzi Lavorante
> >>> <lplavorante at gmail.com> wrote:
> >>>>
> >>>> Hi everybody,
> >>>> Is there  any way to visualize a StructuredGrid's boundary with
> Gouraud
> >>>> shading?
> >>>> When I use a very simple pipeline vtkStructuredGrid ->
> vtkDataSetMapper
> >>>> -> vtkActor I am able to visualize the closed boundary of the grid.
> The
> >>>> polygons used in the rendering are triangles with a flat shading look.
> >>>> If I wish to apply  a Gouraud shading to this boundary, should I
> extract
> >>>> this closed surface as a vtkPolyData and then use vtkPolyDataNormals
> on it?
> >>>> If this is the case, How can I extract the boundary? Should I use
> >>>> vtkStructuredGridGeometryFilter to obtain six separate polydata's
> defining
> >>>> the boundary and then append them using vtkAppendPolyData?
> >>>>
> >>>> Thank you very much for your help
> >>>>
> >>>> Luca Pallozzi Lavorante
> >>>>
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> >>>
> >>>
> >>>
> >>> --
> >>> Cory Quammen
> >>> R&D Engineer
> >>> Kitware, Inc.
> >>
> >>
> >
>
>
>
> --
> Cory Quammen
> R&D Engineer
> Kitware, Inc.
>
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