[vtkusers] Isosurface opacity problem

[Sebastien Jourdain]

Ok,

but this is normal because the ContourFilter will generate a triangulated mesh.

Seb

2010/12/17 이현철 <basalt76 at gmail.com>:
> I sent you two images, input file and iso-contour image.
> I had no problem to look at input file and iso-contour.
>
> Problem is
> when I set Representation option with "Surface with edges".
>
> Input file image looks normal but iso-contour image gone through
> vtkMarchingContourFilter  has triangles.
> Thank you very much.
>
> 2010년 12월 17일 오후 5:35, Sebastien Jourdain <sebastien.jourdain at kitware.com>님의
> 말:
>>
>> The reason is because you ask to look at the input file and not the
>> iso-contour. The little eye on the left is disable in front of the
>> contour.
>>
>> Seb
>>
>> PS: Once you change something on a filter, don't forget to click on Apply
>>
>> 2010/12/17 이현철 <basalt76 at gmail.com>:
>> > I'm very sorry for bothering you.
>> >
>> > I got something interesting.
>> >
>> > In the ParaView, when I set Representation with "Surface with edges".
>> >
>> > The isosurface image went through vtkMarchingContourFilter has the
>> > triangles.
>> > But the original image looks normal.
>> >
>> > I have used vtkCleanPolyData and vtkPolyDataNormals.
>> >
>> > I attached two iamges.
>> >
>> > Thank you ver much.
>> >
>> > Lee.
>> >
>> > 2010년 12월 17일 오후 12:55, 이현철 <basalt76 at gmail.com>님의 말:
>> >>
>> >> Thank you for your advice
>> >>
>> >> I loaded my isosurface into ParaView and set opacity under 1.0.
>> >> It looks normal ~
>> >>
>> >> Is this means that the ParaView do something special to solve
>> >> transparency
>> >> problem ?
>> >>
>> >> I attached the result.
>> >>
>> >> 2010년 12월 15일 오후 11:21, Sebastien Jourdain
>> >> <sebastien.jourdain at kitware.com>님의 말:
>> >>>
>> >>> How did you defined your unstructured grid ? It seems that some inner
>> >>> surface are detected...
>> >>> This could happen if you duplicate the points so each cell has its own
>> >>> points ?
>> >>>
>> >>> Try to load your data into ParaView and see if you can reproduce the
>> >>> problem.
>> >>>
>> >>> Seb
>> >>>
>> >>> 2010/12/15 이현철 <basalt76 at gmail.com>:
>> >>> > Sorry to interrupt you again.
>> >>> >
>> >>> > I attach two images.
>> >>> >
>> >>> > Before and after adding depth sorting.
>> >>> > There are some differences.
>> >>> >
>> >>> > My graphics card seems not to support depth peeling.
>> >>> >
>> >>> > Thank you very mush.
>> >>> >
>> >>> > Lee.
>> >>> >
>> >>> > 2010/12/15 Sebastien Jourdain <sebastien.jourdain at kitware.com>
>> >>> >>
>> >>> >> You should enable depth peeling on the renderer to fix most of the
>> >>> >> artefact. But the rendering will be slower.
>> >>> >>
>> >>> >> Seb
>> >>> >>
>> >>> >> On Tue, Dec 14, 2010 at 10:01 AM, 이현철 <basalt76 at gmail.com> wrote:
>> >>> >> > Dears
>> >>> >> >
>> >>> >> > I visualized isosurface using vtkMarchingContourFilter from
>> >>> >> > vtkUnstructuredGrid.
>> >>> >> >
>> >>> >> > When the opacity is 1.0 , created picture looks normal.
>> >>> >> >
>> >>> >> > But when i adjust opacity to below 1.0, the picture has speckles
>> >>> >> > depends
>> >>> >> > on the position.
>> >>> >> >
>> >>> >> > Do you have any solution ?
>> >>> >> >
>> >>> >> > I'll really appreciate it.
>> >>> >> >
>> >>> >> > Attached images
>> >>> >> >
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>> >>
>> >
>> >
>
>