[vtkusers] Cannot see imagedata behind transparent polydata

[Martin Allerstorfer]

But the biggest problem I have at the moment is that I cannot see the imagedata behind transparent polygons? Sorry for writting so many questions but it is quite urgent for me.

Thank you so much,
Martin 

> I just found out that it works also with imagedata but only for certain
> distances.
> If I zoom into the imagedata suddenly polydata is shown behind imagedata,
> but it should be the other way round.
> Is there an additional parameter to define the distance where depth
> peeling starts?
> 
> Thanks,
> Martin
>  
> > Datum: Thu, 04 Mar 2010 08:45:38 +0100
> > Von: "Martin Allerstorfer" <allerstorfer_martin at gmx.at>
> > An: vtkusers at vtk.org
> > Betreff: [vtkusers] Cannot see imagedata behind transparent polydata
> 
> > Thanks for all the answers! Mathieu, your suggestion using depth pealing
> > works for polydata, but if I want to use imagedata in the same renderer
> > depth calculation does not work between polydata and imagedata? A
> solution for
> > this problem would be great!
> > 
> > Thanks,
> > Martin
> > 
> > >Dealing with non opaque geometry requires sorting the polygon to be
> > >rendered. It would be extremely slow if it was
> > >activated by default.
> > >
> > >Try to use depth peeling. Follow these steps:
> > >
> > >http://www.vtk.org/Wiki/VTK/Depth_Peeling#VTK_calls
> > >
> > >You need OpenGL>=2.0 for it to work.
> > >
> > >On Wed, Mar 3, 2010 at 12:35 PM, Mathieu P <mtp.vtk at gmail.com>
> wrote:
> > >> I have attached a small image illustrating my problem.
> > >>
> > >> I cannot believe VTK cannot manage object opacity !
> > >>
> > >> Thanks for help.
> > >>
> > >>
> > >> Cordialement,
> > >>
> > >> -- Mathieu PICCIN
> > >>
> > >>
> > >>
> > >>
> > >> On Wed, Mar 3, 2010 at 4:50 PM, Mathieu P <mtp.vtk at gmail.com>
> wrote:
> > >>>
> > >>> Actually i am using vtkImageActor and i change their opacity with
> > >>> setOpacity...
> > >>>
> > >>>
> > >>> Cordialement,
> > >>>
> > >>> -- Mathieu PICCIN
> > >>>
> > >>>
> > >>>
> > >>>
> > >>> On Wed, Mar 3, 2010 at 3:57 PM, Mathieu P <mtp.vtk at gmail.com>
> > wrote:
> > >>>>
> > >>>> Same kind of problem here :
> > >>>>
> > >>>> I have two imageData :
> > >>>>
> > >>>> Image data A loaded first
> > >>>> Image data B loaded after
> > >>>>
> > >>>> i modify the opacity to 50% for both image data.
> > >>>> i can see tough the image data B, so the last loaded, but i cannot
> > see
> > >>>> toughthe image data A, the first loaded.
> > >>>> Modifying the opacity of the forst loaded change only its
> luminosity
> > (or
> > >>>> alpha).
> > >>>>
> > >>>>
> > >>>> Cordialement,
> > >>>>
> > >>>> -- Mathieu PICCIN
> > >>>>
> > >>>>
> > >>>>
> > >>>>
> > >>>> On Wed, Mar 3, 2010 at 3:03 PM, Martin Allerstorfer
> > >>>> <allerstorfer_martin at gmx.at> wrote:
> > >>>>>
> > >>>>> Hi,
> > >>>>>
> > >>>>> In my rendering view I would like to show imagedata and
> additionally
> > >>>>> some information using transparent glyphs. But not all glyphs have
> > the same
> > >>>>> transparency. So I change the color and alpha settings for each
> cell
> > of the
> > >>>>> glyphs seperately. Unfortunately now I cannot see the volume
> behind
> > the
> > >>>>> transparent polydata. Does anybody know how to solve this problem?
> > >>>>>
> > >>>>> Thanks,
> > >>>>> Martin
> > >>>>> --
> > >>>>> GRATIS für alle GMX-Mitglieder: Die maxdome Movie-FLAT!
> > >>>>> Jetzt freischalten unter http://portal.gmx.net/de/go/maxdome01
> > >>>>> _______________________________________________
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> > >>>>>
> > >>>>> Visit other Kitware open-source projects at
> > >>>>> http://www.kitware.com/opensource/opensource.html
> > >>>>>
> > >>>>> Please keep messages on-topic and check the VTK FAQ at:
> > >>>>> http://www.vtk.org/Wiki/VTK_FAQ
> > >>>>>
> > >>>>> Follow this link to subscribe/unsubscribe:
> > >>>>> http://www.vtk.org/mailman/listinfo/vtkusers
> > >>>>
> > >>>
> > >>
> > >>
> > >> _______________________________________________
> > >> Powered by www.kitware.com
> > >>
> > >> Visit other Kitware open-source projects at
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> > >>
> > >> Please keep messages on-topic and check the VTK FAQ at:
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> > >>
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> > >>
> > >>
> > 
> > 
> > -- 
> > GRATIS für alle GMX-Mitglieder: Die maxdome Movie-FLAT!
> > Jetzt freischalten unter http://portal.gmx.net/de/go/maxdome01
> > _______________________________________________
> > Powered by www.kitware.com
> > 
> > Visit other Kitware open-source projects at
> > http://www.kitware.com/opensource/opensource.html
> > 
> > Please keep messages on-topic and check the VTK FAQ at:
> > http://www.vtk.org/Wiki/VTK_FAQ
> > 
> > Follow this link to subscribe/unsubscribe:
> > http://www.vtk.org/mailman/listinfo/vtkusers
> 
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> 
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> 
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> 
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