[vtkusers] Depth peeling and Qt

[Sankhesh Jhaveri]

Hi Ignacio,

In general, depth peeling is known to work with VTK and Qt5.
Are you using the QVTKOpenGLWidget
<https://www.vtk.org/doc/nightly/html/classQVTKOpenGLWidget.html>?
Could you post your modifications somewhere for us to see?

Thanks,
Sankhesh
​

On Fri, Jan 12, 2018 at 7:45 AM Ignacio Fernández Galván via vtkusers <
vtkusers at vtk.org> wrote:

> Hi all,
>
> I'm trying to get depth peeling and Qt interface to work together with
> VTK 6.2.0 (Ubuntu 16.04) and python, and I'm not having much success.
>
> Depth peeling with "plain" VTK works fine
> (
> http://vtk.1045678.n5.nabble.com/Enable-depth-peeling-after-initialization-td5746070.html
> ),
> but then problems start
>
> I can't try PyQt4 because "import vtk" crashes (see
> https://gitlab.kitware.com/vtk/vtk/issues/16009).
>
> So I modified
> https://www.vtk.org/Wiki/VTK/Examples/Python/Widgets/EmbedPyQt to work
> with PyQt5. I also modified QVTKRenderWindowInteractor to use PyQt5 and
> configure the RenderWindow with:
>
> self._RenderWindow.SetMultiSamples(0)
> self._RenderWindow.SetAlphaBitPlanes(1)
>
> but (a): the sphere looks weird, like some facets being inside out and
> not being rendered, and (b): depth peeling is not enabled with the
> translucent object that works without Qt.
>
> If I use an external (non-Qt) render window, it works fine, but then the
> event loop conflicts with Qt and I get a working VTK window and a frozen
> Qt interface.
>
> I would appreciate some help or a working example, or even the assertion
> that it will never work.
>
> Thanks,
> Ignacio
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-- 
Sankhesh Jhaveri *Sr. Research & Development Engineer* | Kitware
<http://www.kitware.com/> | (518) 881-4417
​
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