[vtkusers] Isosurface opacity problem

[이현철]

Yes it looks normal in ParaView.

But In my application, after applying depth sorting,
the iso-surface looks like attached file.

Is it vtk version problem ? My vtk is 5.2.1

2010년 12월 17일 오후 9:59, Sebastien Jourdain <sebastien.jourdain at kitware.com>님의
말:

> 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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> >> >>> >> >
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> >> >>> >> >
> >> >>> >
> >> >>> >
> >> >>
> >> >
> >> >
> >
> >
>
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