[vtkusers] Cannot see imagedata behind transparent polydata

[Martin Allerstorfer]

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
>>>>> --
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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