[vtkusers] Cannot see imagedata behind transparent polydata

Wed Mar 10 07:48:48 EST 2010

Bonjour François,

I use image data into image3DActor.
By rendering, i just add an image3DActor into the renderer.

I have 2 images, and one polydata :

      A           the camera

--------------      first image (opacity = 20%)

--------------      second image (opacity = 20%)

OOOOOO      polydatas

I can see the polydatas tough both transparent image, only if the polydatas
opacity is set to 100% (not transparent).
If i move my polydatas opacity to 99%, the polydata disappear behind both
images.

Second question :

can i activate the depth peeling after the renderer constructor. I have
tried to use renderer->Refresh(), and RendererWindow->Start(), but i cannot
activate depth peeling after first renderer->Render();

Thanks a lot,

Cordialement,

-- Mathieu PICCIN

On Mon, Mar 8, 2010 at 2:36 PM, Francois Bertel <francois.bertel at kitware.com
> wrote:

> Is your imagedate 2D? 3D? How do you display your imagedata (ie what's
> your pipeline)?
> If your imagedata is 3D and by "displaying imagedata" you mean volume
> rendering, then no you cannot mixed translucent polygonal geometry and
> volume rendering.
>
> On Mon, Mar 8, 2010 at 8:05 AM, Mathieu P <mtp.vtk at gmail.com> wrote:
> > Hi,
> >
> > I have done some tests, and i can see image data behind transparent
> > polydata, but i cannot see polydata behind transparent image data with
> depth
> > peeling method !
> >
> > It's very strange because without depthpeeling, it's workling well both
> > sides.
> >
> >
> > Cordialement,
> >
> > -- Mathieu PICCIN
> >
> >
> >
> >
> > On Thu, Mar 4, 2010 at 10:22 AM, Mathieu P <mtp.vtk at gmail.com> wrote:
> >>
> >> Martin,
> >>
> >> The solution of using depth peeling doesnt come from me, but from
> Francois
> >> Bertel, from KitWare.
> >> I dont know how do make depth peeling working with transparent
> polygons...
> >>
> >>
> >>
> >> Cordialement,
> >>
> >> -- Mathieu PICCIN
> >>
> >>
> >>
> >>
> >> On Thu, Mar 4, 2010 at 9:31 AM, Martin Allerstorfer
> >> <allerstorfer_martin at gmx.at> wrote:
> >>>
> >>> 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
> >>> > > >>>>> _______________________________________________
> >>> > > >>>>> 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
> >>> > > >>>>
> >>> > > >>>
> >>> > > >>
> >>> > > >>
> >>> > > >> _______________________________________________
> >>> > > >> 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
> >>> > > >>
> >>> > > >>
> >>> > >
> >>> > >
> >>> > > --
> >>> > > 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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> >>> > jetzt kostenlos herunterladen! http://portal.gmx.net/de/go/chbrowser
> >>> > _______________________________________________
> >>> > 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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> >>> jetzt kostenlos herunterladen! http://portal.gmx.net/de/go/atbrowser
> >>> _______________________________________________
> >>> 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
> >>
> >
> >
> > _______________________________________________
> > 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
> >
> >
>
>
>
> --
> François Bertel, PhD  | Kitware Inc. Suite 204
> 1 (518) 371 3971 x113 | 28 Corporate Drive
>                      | Clifton Park NY 12065, USA
> _______________________________________________
> 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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