[vtkusers] Opacity with multiple meshes

[Nicolas Rannou]

I'm using a QVTKWidget to render my scene and it seems to be the problem.
(a simple example works properly but my application does not)

Can I somehow turn opengl on in this QVTKWidget, should I customize
QVTKWidget to inherit from a QGLWidget, etc.?
Is there any option in vkt's cmake to allow such a thing?

Thanks

On Thu, Jan 26, 2012 at 4:11 PM, Nicolas Rannou <nicolas.lists at gmail.com>wrote:

> Thanks for the suggestions I'm giving it a try!
>
> I'll use depth peeling since I need the objects to remain distincts and it
> looks more straight forward.
> It looks like I should also set "renderWindow->SetAlphaBitPlanes(1)"
>
>
> On Thu, Jan 26, 2012 at 3:18 PM, David E DeMarle <dave.demarle at kitware.com
> > wrote:
>
>> And since you have multiple meshes, for depth sort to work, you need to
>> append them all together first, then depth sort that. Otherwise the opacity
>> is only correct within each one, not amongst them.
>>
>> David E DeMarle
>> Kitware, Inc.
>> R&D Engineer
>> 21 Corporate Drive
>> Clifton Park, NY 12065-8662
>> Phone: 518-881-4909
>>
>>
>> On Thu, Jan 26, 2012 at 3:13 PM, David E DeMarle <
>> dave.demarle at kitware.com> wrote:
>>
>>> Use depth peeling.
>>> http://www.vtk.org/Wiki/VTK/Depth_Peeling
>>>
>>> Or vtkDepthSortPolyData before rendering.
>>>
>>> David E DeMarle
>>> Kitware, Inc.
>>> R&D Engineer
>>> 21 Corporate Drive
>>> Clifton Park, NY 12065-8662
>>> Phone: 518-881-4909
>>>
>>>
>>> On Thu, Jan 26, 2012 at 3:10 PM, Nicolas Rannou <nicolas.lists at gmail.com
>>> > wrote:
>>>
>>>> Hello,
>>>>
>>>> I have several meshes I want to visualize.
>>>>
>>>> If I decrease the opacity of those meshes, the visualization goes wrong:
>>>> I don't see a nice "superposition effect", instead I only see the
>>>> "last" object "in the ray".
>>>>
>>>> Decreasing the opacity,
>>>> - paraview has the expected behavior
>>>> - the vtk example (
>>>> http://www.vtk.org/Wiki/VTK/Examples/Cxx/Visualization/Opacity) has
>>>> the wrong behavior.
>>>>
>>>> I could find which option to use to enable a proper behavior...
>>>>
>>>> Thanks,
>>>> Nicolas
>>>>
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>>
>
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