[vtk-developers] Transparency/depth peeling with Python and Qt on Linux

Prabhu Ramachandran prabhu at aero.iitb.ac.in
Sun Nov 11 22:18:52 EST 2018

Just another data point.  This is definitely Qt5 related as the script works
fine with Qt4.8.x (PySide-1.2.2).


On 11/11/18 10:05 PM, Prabhu Ramachandran wrote:
> Hi all,
> Some folks have been running into strange rendering issues with the Qt Render
> window interactor in Python, on Linux, with transparent actors.  I've reduced
> this to two scripts that I attach which just require VTK-Python.  The first is
> with pure VTK and which seems to work fine and the second is with the
> QVTKRenderWindowInteractor which fails.
> The script just creates two semi-transparent spheres one next to the other and
> turns on depth peeling. When the example fails, the blue ball can never be
> seen in front of the red one.  This example works fine with VTK 8.1.1 on Mac
> OSX but fails on Linux (ubuntu 16.04 and 18.04).  The non pyqt one works just
> fine.  I did try experimenting with using QGLWidget and also with using the
> newer QOpenGLWidget but they both display the same issue on Linux it seems like.
> Have any of you seen this before?  The blog post here:
> https://blog.kitware.com/vtk-8-0-0/ suggests there are some transparency
> issues with the C++ widget as well but I am not sure if those are already
> resolved.  Any thoughts or pointers on this?
> Thanks!
> cheers,
> Prabhu

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