[vtkusers] Gouraud shading of a vtkStructuredGrid's boundary

[Cory Quammen]

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.