[vtkusers] Cannot see imagedata behind transparent polydata

[Mathieu P]

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!
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>> > > >>>>> _______________________________________________
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>> > > >>>>>
>> > > >>>>> 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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>> > > >>>
>> > > >>
>> > > >>
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>> > > >>
>> > > >> Visit other Kitware open-source projects at
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>> > >
>> > > --
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>> > > Jetzt freischalten unter http://portal.gmx.net/de/go/maxdome01
>> > > _______________________________________________
>> > > 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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>> _______________________________________________
>> 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:
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